Toyota Avalon (XX50): AV Signal Stoppage (Low Battery Voltage) (B158F). Lost Communication with Meter (B1324). HD Radio Tuner Malfunction (B1551,B158D,B15A0,B15B0,B15B3,B15B7,B15BA,B15F9)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System(for Hv Model) / AV Signal Stoppage (Low Battery Voltage) (B158F). Lost Communication with Meter (B1324). HD Radio Tuner Malfunction (B1551,B158D,B15A0,B15B0,B15B3,B15B7,B15BA,B15F9)

AV Signal Stoppage (Low Battery Voltage) (B158F)

DESCRIPTION

This DTC is stored when a video or audio signal is interrupted due to auxiliary battery voltage input to the radio and display receiver assembly dropping temporarily.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B158F	AV Signal Stoppage (Low Battery Voltage)	A video or audio signal is interrupted when the auxiliary battery voltage drops	Radio and display receiver assembly Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
Click here
When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK VEHICLE SIGNAL (OPERATION CHECK)

(a) Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check.

Click here

(b) Measure the auxiliary battery voltage.

Standard Voltage:

11 to 15.5 V

HINT:

This display is updated once per second.

GO TO STEP 3

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

END

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY POWER SOURCE)

(a) Disconnect the G3 radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G3-4 (+B1) - Body ground	Power switch off	11 to 14 V

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Lost Communication with Meter (B1324)

DESCRIPTION

This DTC is stored when a communication error occurs between the radio and display receiver assembly and combination meter assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1324	Lost Communication with Meter	CAN reception error	Local bus communication line Combination meter power source circuit Radio and display receiver assembly Combination meter assembly Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
Click here
When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY POWER SOURCE)

(a) Disconnect the G16 combination meter assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G16-21 (ES) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
G16-40 (B) - Body ground	Power switch off	11 to 14 V
G16-39 (IG+) - Body ground	Power switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the G16 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G16-36 (TX+) - G16-37 (TX-)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE COMBINATION METER ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the G16 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-5 (CNH1) - G16-36 (TX+)	Always	Below 1 Ω
G2-6 (CNL1) - G16-37 (TX-)	Always	Below 1 Ω
G2-5 (CNH1) or G16-36 (TX+) - Body ground	Always	10 kΩ or higher
G2-6 (CNL1) or G16-37 (TX-) - Body ground	Always	10 kΩ or higher

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

HD Radio Tuner Malfunction (B1551,B158D,B15A0,B15B0,B15B3,B15B7,B15BA,B15F9)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the radio and display receiver assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1551	HD Radio Tuner Malfunction	When any of the following conditions is met: "HD Radio" tuner decorder malfunction "HD Radio" tuner audio output section malfunction "HD Radio" tuner decorder RF/IF malfunction	Radio and display receiver assembly
B158D	Video Signal Stoppage	The internal video signal of the radio and display receiver assembly is interrupted	Radio and display receiver assembly
B15A0	LAN Master Malfunction	When either of the following conditions is met: Bus malfunction EEPROM error	Radio and display receiver assembly
B15B0	Display Screen Malfunction	Picture circuit (TFT unit) malfunction	Radio and display receiver assembly
B15B3	Radio Tuner Malfunction	When any of the following conditions is met: AM tuner PLL is unlocked FM tuner PLL is unlocked Tuner malfunction	Radio and display receiver assembly
B15B7	Bluetooth Module Malfunction	"Bluetooth" module malfunction	Radio and display receiver assembly
B15BA	XM Tuner Malfunction	When either condition below is met: Internal IC malfunction Tuner malfunction	Radio and display receiver assembly
B15F9	UART Communication Malfunction(for A/C)	When either of the following conditions is met: Open in UART communication line is detected during radio and display receiver assembly startup routine Open in UART communication line is detected based on communication error	Radio and display receiver assembly

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
Click here
When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.

PROCEDURE

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

USE SIMULATION METHOD TO CHECK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

Main Body ECU Vehicle Information Reading/Writing Process Malfunction (B15F6). Certification ECU Vehicle Information Reading/Writing Process Malfunction (B15F7). XM Tuner Antenna Disconnected (B15FE,B

Voice Recognition Microphone Disconnected (B1579)

See More:

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