Toyota Avalon (XX50): Active Noise Control System

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Active Noise Control System

ANC ECU EEPROM Data Memory Failure (B1AA044)

DESCRIPTION

This DTC are stored when a malfunction occurs in the stereo component equalizer assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1AA044	ANC ECU EEPROM Data Memory Failure	Stereo component equalizer assembly malfunction	Stereo component equalizer assembly

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA044 is not output.

USE SIMULATION METHOD TO CHECK

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

UART Communication Between ANC and Audio Amplifier Missing Message (B1AA187)

DESCRIPTION

This DTC is stored when an UART communication error occurs between the stereo component equalizer assembly and stereo component amplifier assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1AA187	UART Communication Between ANC and Audio Amplifier Missing Message	Stereo component equalizer assembly detects a UART communication malfunction in stereo component amplifier assembly for 4 seconds or more continuously*	Harness or connector Stereo component amplifier assembly Stereo component equalizer assembly

HINT:

*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.

After engine switch is turned on (ACC) for 3 seconds or more.
After the battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after battery voltage has returned to normal.

WIRING DIAGRAM

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA187 is not output.

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the G69 stereo component amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-2 (ACK1) - G69-2 (ACK1)	Always	Below 1 Ω
G68-16 (ACK2) - G69-10 (ACK2)	Always	Below 1 Ω
G68-2 (ACK1) or G69-2 (ACK1) - Body ground	Always	10 kΩ or higher
G68-16 (ACK2) or G69-10 (ACK2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

(a) Replace the stereo component amplifier assembly with a new or known good one.

Click here

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

6.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA187 is not output.

END (STEREO COMPONENT AMPLIFIER ASSEMBLY IS DEFECTIVE)

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

Front Left Microphone Circuit Component Internal Failure (B1AA296,B1AA31C)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the No. 1 active noise control microphone system.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1AA296	Front Left Microphone Circuit Component Internal Failure	Stereo component equalizer assembly detects malfunction in No. 1 active noise control microphone for 4 seconds or more continuously when engine speed is 1200 rpm or more*	Harness or connector No. 1 active noise control microphone Stereo component equalizer assembly
B1AA31C	Front Left Microphone Circuit Circuit Voltage Out of Range	Stereo component equalizer assembly detects No. 1 active noise control microphone connection malfunction for 4 seconds or more continuously*	Harness or connector No. 1 active noise control microphone Stereo component equalizer assembly

HINT:

*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.

After engine switch is turned on (ACC) for 3 seconds or more.
After the battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after battery voltage has returned to normal.

WIRING DIAGRAM

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA296 and B1AA31C are not output.

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - NO. 1 ACTIVE NOISE CONTROL MICROPHONE)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the O13 No. 1 active noise control microphone connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-7 (MC1+) - O13-1 (MC1+)	Always	Below 1 Ω
G68-21 (MC1-) - O13-2 (MC1-)	Always	Below 1 Ω
G68-7 (MC1+) or O13-1 (MC1+) - Body ground	Always	10 kΩ or higher
G68-21 (MC1-) or O13-2 (MC1-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE NO. 1 ACTIVE NOISE CONTROL MICROPHONE

(a) Replace the No. 1 active noise control microphone with a new or known good one.

Click here

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

6.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA296 and B1AA31C are not output.

END (NO. 1 ACTIVE NOISE CONTROL MICROPHONE IS DEFECTIVE)

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

Front Right Microphone Circuit Component Internal Failure (B1AA696,B1AA71C)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the No. 2 active noise control microphone system.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1AA696	Front Right Microphone Circuit Component Internal Failure	Stereo component equalizer assembly detects malfunction in No. 2 active noise control microphone for 4 seconds or more continuously when engine speed is 1200 rpm or more*	Harness or connector No. 2 active noise control microphone Stereo component equalizer assembly
B1AA71C	Front Right Microphone Circuit Circuit Voltage Out of Range	Stereo component equalizer assembly detects No. 2 active noise control microphone connection malfunction for 4 seconds or more continuously*	Harness or connector No. 2 active noise control microphone Stereo component equalizer assembly

HINT:

*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.

After engine switch is turned on (ACC) for 3 seconds or more.
After the battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after battery voltage has returned to normal.

WIRING DIAGRAM

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA696 and B1AA71C are not output.

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - NO. 2 ACTIVE NOISE CONTROL MICROPHONE)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the O14 No. 2 active noise control microphone connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-6 (MC2+) - O14-1 (MC2+)	Always	Below 1 Ω
G68-20 (MC2-) - O14-2 (MC2-)	Always	Below 1 Ω
G68-6 (MC2+) or O14-1 (MC2+) - Body ground	Always	10 kΩ or higher
G68-20 (MC2-) or O14-2 (MC2-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE NO. 2 ACTIVE NOISE CONTROL MICROPHONE

(a) Replace the No. 2 active noise control microphone with a new or known good one.

Click here

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

6.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA696 and B1AA71C are not output.

END (NO. 2 ACTIVE NOISE CONTROL MICROPHONE IS DEFECTIVE)

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

Rear Center Microphone Circuit Component Internal Failure (B1AAA96,B1AAB1C)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the No. 3 active noise control microphone system.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1AAA96	Rear Center Microphone Circuit Component Internal Failure	Stereo component equalizer assembly detects malfunction in No. 3 active noise control microphone for 4 seconds or more continuously when engine speed is 1200 rpm or more*	Harness or connector No. 3 active noise control microphone Stereo component equalizer assembly
B1AAB1C	Rear Center Microphone Circuit Circuit Voltage Out of Range	Stereo component equalizer assembly detects No. 3 active noise control microphone connection malfunction for 4 seconds or more continuously*	Harness or connector No. 3 active noise control microphone Stereo component equalizer assembly

HINT:

*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.

After engine switch is turned on (ACC) for 3 seconds or more.
After the battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after battery voltage has returned to normal.

WIRING DIAGRAM

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AAA96 and B1AAB1C are not output.

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - NO. 3 ACTIVE NOISE CONTROL MICROPHONE)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the O15 No. 3 active noise control microphone connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-5 (MC3+) - O15-1 (MC3+)	Always	Below 1 Ω
G68-19 (MC3-) - O15-2 (MC3-)	Always	Below 1 Ω
G68-5 (MC3+) or O15-1 (MC3+) - Body ground	Always	10 kΩ or higher
G68-19 (MC3-) or O15-2 (MC3-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE NO. 3 ACTIVE NOISE CONTROL MICROPHONE

(a) Replace the No. 3 active noise control microphone with a new or known good one.

Click here

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

6.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AAA96 and B1AAB1C are not output.

END (NO. 3 ACTIVE NOISE CONTROL MICROPHONE IS DEFECTIVE)

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Active Noise Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Active Noise Control > Data List

Tester Display	Measurement Item	Range	Reference Value	Diagnostic Note
Total Distance Traveled	Displays the current total driving distance	0 to 16777215	Equivalent to the actual total driving distance	Refer to the Total Distance Traveled - Unit for the units
Total Distance Traveled - Unit	Displays the current total driving distance units	km or mile	Units according destination	-

ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Active Noise Control / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Active Noise Control > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Sound (All CH)	Test sound outputs in following order: Front No. 1 speaker assembly LH → Front No. 1 speaker assembly RH → Rear No. 3 speaker assembly	ON or OFF	-
Sound "CH1"	Test sound output from front No. 1 speaker assembly LH	ON or OFF	-
Sound "CH2"	Test sound output from front No. 1 speaker assembly RH	ON or OFF	-
Sound "CH3"	Test sound output from rear No. 3 speaker assembly	ON or OFF	-
Sound "CH4"	-	-	Cannot be used

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Active Noise Control System

DTC No.	Detection Item	Link
B1AA044	ANC ECU EEPROM Data Memory Failure
B1AA187	UART Communication Between ANC and Audio Amplifier Missing Message
B1AA296	Front Left Microphone Circuit Component Internal Failure
B1AA31C	Front Left Microphone Circuit Circuit Voltage Out of Range
B1AA696	Front Right Microphone Circuit Component Internal Failure
B1AA71C	Front Right Microphone Circuit Circuit Voltage Out of Range
B1AAA96	Rear Center Microphone Circuit Component Internal Failure
B1AAB1C	Rear Center Microphone Circuit Circuit Voltage Out of Range
P033531	Crankshaft Position Sensor "A" No Signal
U010087	Lost Communication With ECM/PCM "A" Missing Message
U012987	Lost Communication With Brake System Control Module Missing Message
U014087	Lost Communication with Body Control Module Missing Message

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK FOR DTC (CHECK USING TECHSTREAM)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Active Noise Control / Trouble Codes.

Body Electrical > Active Noise Control > Trouble Codes

(e) Check the details of the DTC(s).

Click here

CLEAR DTC (CLEAR USING TECHSTREAM)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Active Noise Control / Trouble Codes.

(e) Clear DTCs.

Click here

Body Electrical > Active Noise Control > Clear DTCs

Freeze Frame Data

FREEZE FRAME DATA

CHECK FREEZE FRAME DATA

HINT:

Whenever an active noise control system DTC is stored, the stereo component equalizer assembly stores the current vehicle state as freeze frame data.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Active Noise Control / Trouble Codes.

Body Electrical > Active Noise Control > Trouble Codes

(e) According to the Techstream display, select a DTC that stored freeze frame data.

NOTICE:

Read the freeze frame data recorded when the DTC was stored.

LIST OF FREEZE FRAME DATA

Body Electrical > Active Noise Control

Tester Display	Measurement Item	Range	Reference Value	Diagnostic Note
Total Distance Traveled	Displays the current total driving distance	0 to 16777215	Equivalent to the actual total driving distance	Refer to the Total Distance Traveled - Unit for the units
Total Distance Traveled - Unit	Displays the current total driving distance units	km or mile	Units according destination	-

How To Proceed With Troubleshooting

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK

3.	INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard voltage:

11 to 14 V

HINT:

If the battery voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

4.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if the CAN communication system is functioning normally.

Click here

Result	Proceed to
CAN communication system DTCs are not output.	A
CAN communication system DTCs are output.	B

GO TO CAN COMMUNICATION SYSTEM

5.	CHECK FOR DTC

(a) Check for DTCs and note any codes that are output.

Body Electrical > Active Noise Control > Trouble Codes

(b) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

(c) Recheck for DTCs. Try to reproduce the active noise control system DTCs by duplicating the conditions indicated by the DTCs.

Body Electrical > Active Noise Control > Trouble Codes

Result	Proceed to
DTCs are not output (Problem symptom occurs)	A
DTCs are output	B
DTCs are not output (Problem symptom does not occur)	C

GO TO DIAGNOSTIC TROUBLE CODE CHART

USE SIMULATION METHOD TO CHECK

6.	PROBLEM SYMPTOMS TABLE

HINT:

Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table.	A
Fault is listed in Problem Symptoms Table.	B

PERFORM TROUBLESHOOTING BASED ON PROBLEM SYMPTOM

7.	OVERALL ANALYSIS AND TROUBLESHOOTING

(a) Terminals of ECU

Click here

(b) Data List / Active Test

Click here

8.	ADJUST, REPAIR OR REPLACE

9.	CONFIRMATION TEST

END

Input / Output Signal Circuit

DESCRIPTION

The stereo component equalizer assembly uses this circuit to send and receive signals to and from the stereo component assembly.

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the G69 stereo component amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-12 (CH1+) - G69-8 (AN1+)	Always	Below 1 Ω
G68-26 (CH1-) - G69-16 (AN1-)	Always	Below 1 Ω
G68-11 (CH2+) - G69-7 (AN2+)	Always	Below 1 Ω
G68-25 (CH2-) - G69-15 (AN2-)	Always	Below 1 Ω
G68-10 (CH3+) - G69-6 (AN3+)	Always	Below 1 Ω
G68-24 (CH3-) - G69-14 (AN3-)	Always	Below 1 Ω
G69-13 (ASG1) - Body ground	Always	10 kΩ or higher
G68-17 (ACNT) - G69-3 (ACNT)	Always	Below 1 Ω
G68-12 (CH1+) or G69-8 (AN1+) - Body ground	Always	10 kΩ or higher
G68-26 (CH1-) or G69-16 (AN1-) - Body ground	Always	10 kΩ or higher
G68-11 (CH2+) or G69-7 (AN2+) - Body ground	Always	10 kΩ or higher
G68-25 (CH2-) or G69-15 (AN2-) - Body ground	Always	10 kΩ or higher
G68-10 (CH3+) or G69-6 (AN3+) - Body ground	Always	10 kΩ or higher
G68-24 (CH3-) or G69-14 (AN3-) - Body ground	Always	10 kΩ or higher
G68-17 (ACNT) or G69-3 (ACNT) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Crankshaft Position Sensor "A" No Signal (P033531)

DESCRIPTION

This DTC is output when a malfunction has occurred in the engine pulse signal system from the ECM.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P033531	Crankshaft Position Sensor "A" No Signal	Stereo component equalizer assembly detects malfunction in engine pulse signal system for 10 seconds or more continuously when engine speed is between 500 and 6000 rpm*	Harness or connector SFI system Stereo component equalizer assembly

HINT:

*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.

After engine switch is turned on (ACC) for 3 seconds or more.
After the battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after battery voltage has returned to normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Refer to when replacing the ECM.

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC P033531 is not output.

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - ECM)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the A18 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-3 (NEI) - A18-30 (NEO)	Always	Below 1 Ω
G68-3 (NEI) or A18-30 (NEO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK ECM

(a) According to the table and using an oscilloscope, measure the waveform with the stereo component equalizer assembly connected.

Component with harness connected

(Stereo Component Equalizer Assembly)

Waveform

Item	Condition
Measurement terminal	G68-3 (NEI) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Vehicle condition	Idling after warming up

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only. The waveform fluctuates according to engine speed.

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

GO TO SFI SYSTEM

Parts Location

PARTS LOCATION

ILLUSTRATION

ECM

INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

- ECU-B NO. 2 FUSE

- ECU-IG1 NO. 4 FUSE

- ECU-ACC FUSE

DLC3

STEREO COMPONENT EQUALIZER ASSEMBLY

ILLUSTRATION

*1	FRONT NO. 1 SPEAKER ASSEMBLY LH	*2	FRONT NO. 1 SPEAKER ASSEMBLY RH
*3	REAR NO. 3 SPEAKER ASSEMBLY	*4	NO. 1 ACTIVE NOISE CONTROL MICROPHONE
*5	NO. 2 ACTIVE NOISE CONTROL MICROPHONE	*6	NO. 3 ACTIVE NOISE CONTROL MICROPHONE
*7	STEREO COMPONENT AMPLIFIER ASSEMBLY	-	-

Power Source Circuit

DESCRIPTION

This circuit is the power source circuit for the stereo component equalizer assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses and relays for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - BATTERY [+B, IGN] AND BODY GROUND)

(a) Disconnect the stereo component equalizer assembly connector.

*a	Front view of wire harness connector (to Stereo Component Equalizer Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G68-14 (+B) - Body ground	Always	11 to 14 V
G68-27 (IGN) - Body ground	Engine switch on (IG)	11 to 14 V
G68-13 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-28 (GND) - Body ground	Always	Below 1 Ω

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Precaution

PRECAUTION

PRECAUTION FOR ACTIVE NOISE CONTROL SYSTEM

(a) If the active noise control microphone garnish hole is blocked, clean away the blockage and perform diagnosis.

(b) If heavy objects are loaded onto the rear package tray, remove them before performing diagnosis.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before checking parts for malfunctions, check that the audio system operates normally.
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

HINT:

Removing dealer installed options and optional components before performing diagnosis makes it easier to determine the location of a malfunction.

Active Noise Control System

Symptom	Suspected Area	Link
Muffled engine sounds in cabin	Proceed to "Power Source Circuit"
	Proceed to "Input / Output Signal Circuit"
	Front No. 1 speaker assembly LH
	Front No. 1 speaker assembly RH
	Rear No. 3 speaker assembly
	Harness or connector	-
	Stereo component equalizer assembly
	Stereo component amplifier assembly
Abnormal noise from speakers	Front No. 1 speaker assembly LH
	Front No. 1 speaker assembly RH
	Rear No. 3 speaker assembly
	Harness or connector	-
	Stereo component equalizer assembly
	Stereo component amplifier assembly

System Description

SYSTEM DESCRIPTION

ACTIVE NOISE CONTROL SYSTEM

(a) The active noise control system is a system that detects muffled engine sounds produced in sync that fluctuates according to the engine speed, by using the active noise control microphone and outputs anti-phase control sound through the audio speakers to reduce muffled engine sounds.

The active noise control system includes the following functions.

Function Name	Function Description	Operation Conditions
ANC (Active Noise Control) Function	Function that reduces noise by using anti-phase and vibration control sound to interfere with muffled sounds	Engine running, engine speed 1000 rpm or higher
ESE (Engine Sound Enhancement) Function	Function that produces realistic engine sounds by adding frequency component sound according to driving conditions such as vehicle speed and accelerator pedal depression	Engine running, vehicle speed exceeding 0 km/h (0 mph)

System Diagram

SYSTEM DIAGRAM

Terminals Of Ecu

TERMINALS OF ECU

STEREO COMPONENT EQUALIZER ASSEMBLY

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G68-1 (CANH)	P	CAN communication signal	-	-
G68-2 (ACK1)	V	Serial communication (UART) signal	-	-
G68-3 (NEI) - G68-28 (GND)	LA-B - W-B	Engine pulse signal	Idling with warm engine	Pulse generation (See waveform 1)
G68-5 (MC3+) - G68-28 (GND)	R - W-B	Active noise control microphone input signal	No. 3 active noise control microphone tapped with finger	Pulse generation
G68-6 (MC2+) - G68-28 (GND)	B - W-B	Active noise control microphone input signal	No. 2 active noise control microphone tapped with finger	Pulse generation
G68-7 (MC1+) - G68-28 (GND)	V - W-B	Active noise control microphone input signal	No. 1 active noise control microphone tapped with finger	Pulse generation
G68-10 (CH3+) - G68-28 (GND)	SB - W-B	Active noise control microphone output signal	Active noise control system operating	Pulse generation
G68-11 (CH2+) - G68-28 (GND)	L - W-B	Active noise control microphone output signal	Active noise control system operating	Pulse generation
G68-12 (CH1+) - G68-28 (GND)	Y - W-B	Active noise control microphone output signal	Active noise control system operating	Pulse generation
G68-13 (ACC) - G68-28 (GND)	P - W-B	Power source (ACC)	Engine switch on (ACC)	11 to 14 V
G68-14 (+B) - G68-28 (GND)	LA-G - W-B	Power source	Always	11 to 14 V
G68-15 (CANL)	W	CAN communication signal	-	-
G68-16 (ACK2)	BE	Serial communication (UART) signal	-	-
G68-17 (ACNT) - G68-28 (GND)	SB - W-B	Active noise control system control signal	Engine switch on (IG)	Below 1 V
G68-17 (ACNT) - G68-28 (GND)	SB - W-B	Active noise control system control signal	Engine switch on (ACC)	4.5 V or higher
G68-19 (MC3-) - G68-28 (GND)	G - W-B	Active noise control microphone input signal	Always	Below 1 Ω
G68-20 (MC2-) - G68-28 (GND)	P - W-B	Active noise control microphone input signal	Always	Below 1 Ω
G68-21 (MC1-) - G68-28 (GND)	LG - W-B	Active noise control microphone input signal	Always	Below 1 Ω
G68-24 (CH3-) - G68-28 (GND)	P - W-B	Active noise control microphone output signal	Active noise control system operating	Pulse generation
G68-25 (CH2-) - G68-28 (GND)	V - W-B	Active noise control microphone output signal	Active noise control system operating	Pulse generation
G68-26 (CH1-) - G68-28 (GND)	LG - W-B	Active noise control microphone output signal	Active noise control system operating	Pulse generation
G68-27 (IGN) - G68-28 (GND)	LA-SB - W-B	Power source (IG)	Engine switch on (IG)	11 to 14 V
G68-28 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

(a) Waveform 1

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only. The waveform fluctuates according to engine speed.

Item	Condition
Measurement terminal	G68-3 (NEI) - G68-28 (GND)
Tool setting	5 V/DIV., 20 ms./DIV.
Vehicle condition	Idling after warming up

STEREO COMPONENT AMPLIFIER ASSEMBLY

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G69-2 (ACK1)	GR	Serial communication (UART) signal	-	-
G69-3 (ACNT)	B	Active noise control system control signal	Active noise control system operating	Below 1 V
G69-3 (ACNT)	B	Active noise control system control signal	Active noise control system not operating	4.5 V or higher
G69-6 (AN3+)	G	Active noise control microphone input signal	Active noise control system operating	Pulse generation
G69-7 (AN2+)	R	Active noise control microphone input signal	Active noise control system operating	Pulse generation
G69-8 (AN1+)	W	Active noise control microphone input signal	Active noise control system operating	Pulse generation
G69-10 (ACK2)	V	Serial communication (UART) signal	-	-
G69-13 (ASG1)	Shielded - W-B	Shield ground	Always	Below 1 Ω
G69-14 (AN3-)	GR	Active noise control microphone input signal	Active noise control system operating	Pulse generation
G69-15 (AN2-)	L	Active noise control microphone input signal	Active noise control system operating	Pulse generation
G69-16 (AN1-)	B	Active noise control microphone input signal	Active noise control system operating	Pulse generation

Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the CAN communication circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U010087	Lost Communication With ECM/PCM "A" Missing Message	Stereo component equalizer assembly detects CAN communication malfunction in engine system for 1 second or more continuously, 3 seconds or more after engine switch is turned on (IG)*	CAN communication system
U012987	Lost Communication With Brake System Control Module Missing Message	Stereo component equalizer assembly detects CAN communication malfunction in brake system for 1 second or more continuously, 3 seconds or more after engine switch is turned on (IG)*	CAN communication system
U014087	Lost Communication with Body Control Module Missing Message	Stereo component equalizer assembly detects CAN communication malfunction in main body ECU for 3 seconds or more continuously, 3 seconds or more after engine switch is turned on (IG)*	CAN communication system

HINT:

*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.

After engine switch is turned on (ACC) for 3 seconds or more.
After the battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after battery voltage has returned to normal.

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC U010087, U012987 and U014087 are not output

HINT:

If CAN communication system malfunction DTCs are output, they may also be output for other systems.
If the CAN communication system has been checked and repaired in other systems, the DTC will not be output after rechecking for DTCs.
If the DTC is output frequently, duplicate the conditions that cause a malfunction and perform the check again, even though the DTC was not output after rechecking for DTCs.
Click here

USE SIMULATION METHOD TO CHECK

GO TO CAN COMMUNICATION SYSTEM

Active Noise Control Microphone

Amplifier Antenna

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