Toyota Avalon (XX50): How To Proceed With Troubleshooting. Illumination Circuit. Illumination for Panel Switch does not Come on with Tail Switch ON

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System(for Hv Model) / How To Proceed With Troubleshooting. Illumination Circuit. Illumination for Panel Switch does not Come on with Tail Switch ON

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the audio and visual system.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

When troubleshooting, check that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

The following 5 items are important points for problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Driving conditions, weather conditions
How did it happen?	Problem symptoms

3.	INSPECT AUXILIARY BATTERY

(a) Measure the auxiliary battery voltage with the power switch off.

Standard Voltage:

11 to 14 V

HINT:

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

4.	CHECK CABIN

(a) Check that condensation is not likely to occur in the cabin and that the temperature is not high or extremely low in the cabin.

OK:

Condensation is not likely being produced and the temperature is not high or extremely low.

HINT:

A humid cabin and a rapid change in temperature may lead to condensation. Condensation in the cabin may cause a short circuit.
The audio and visual system may not operate normally when the temperature is -20°C (-4°F) or lower, or 65°C (149°F) or higher.

SET CABIN TO APPROPRIATE TEMPERATURE

5.	CHECK CAN COMMUNICATION SYSTEM*

(a) Check if CAN communication system DTCs are output.

Click here

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

GO TO CAN COMMUNICATION SYSTEM

6.	CHECK FOR DTC*

(a) Check for DTCs.

Body Electrical > Navigation System > Trouble Codes

Result	Proceed to
DTCs are output.	A
DTCs are not output.	B

GO TO STEP 10

7.	DTC CLEAR*

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

HINT:

The present DTCs may not indicate actual malfunctions depending on the vehicle operating conditions.

8.	RECHECK FOR DTC*

(a) Recheck for DTCs.

Body Electrical > Navigation System > Trouble Codes

Result	Proceed to
DTCs are output.	A
DTCs are not output.	B

HINT:

Even if the problem symptom is not confirmed, check for DTCs. This is because the system stores history DTCs.
If more information is needed, perform a recheck using the "System Check Mode" screen after rechecking for DTCs using the Techstream.
Check for DTCs and inspect the area that the code indicates.

GO TO STEP 10

9.	DIAGNOSTIC TROUBLE CODE CHART

(a) Find the output DTC in Diagnostic Trouble Code Chart.

Click here

GO TO STEP 12

10.	PROBLEM SYMPTOMS TABLE

(a) 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

HINT:

If the symptoms do not recur and no DTCs are output, attempt to reproduce the symptoms.

Click here

GO TO STEP 12

11.	PERFORM TROUBLESHOOTING BASED ON PROBLEM SYMPTOM

(a) Refer to Terminals of ECU.

Click here

12.	CHECK CIRCUIT

(a) Adjust, repair or replace as necessary.

13.	RECHECK FOR DTC*

(a) After clearing DTCs, recheck for DTCs.

Body Electrical > Navigation System > Clear DTCs Body Electrical > Navigation System > Trouble Codes

14.	PERFORM CONFIRMATION TEST

END

Illumination Circuit

DESCRIPTION

Power is supplied to the radio and display receiver assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK ILLUMINATION

(a) Check if the illumination for the radio and display receiver assembly, steering pad switch assembly, heater control switch or others (hazard switch, transmission control switch, etc.) comes on when the light control switch is turned to the head or tail position.

Result	Proceed to
Illumination comes on for all components except steering pad switch assembly.	A
Illumination comes on for all components except radio and display receiver assembly.	B
No illumination comes on (radio and display receiver assembly, hazard switch, heater control switch, etc.).	C

GO TO STEP 5

GO TO LIGHTING SYSTEM

2.	CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the G17 spiral cable sub-assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G17-14 (IL+2) - Body ground	Light control switch in tail or head position	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly.

Click here

(b) Inspect the steering pad switch assembly.

Click here

REPLACE STEERING PAD SWITCH ASSEMBLY

4.	INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly.

Click here

(b) Inspect the spiral cable sub-assembly.

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY, COMBINATION METER ASSEMBLY)

REPLACE SPIRAL CABLE SUB-ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the G2 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
G2-15 (ILL+) - Body ground	Light control switch in tail or head position	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	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
G2-16 (ILL-) - G16-1 (ILL-)	Always	Below 1 Ω
G2-16 (ILL-) or G16-1 (ILL-) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Illumination for Panel Switch does not Come on with Tail Switch ON

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

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) Check that the display changes between ON and OFF according to the light control switch operation.

OK:

Light Control Switch	Display
Tail or head	ON
Off or AUTO	OFF

HINT:

This display is updated once per second. As a result, it is normal for the display to lag behind the actual switch operation.
Make sure to move the vehicle to a bright area before performing an operation check with the light control switch in the AUTO position.

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Does not Play even after Bluetooth Audio Mode is Selected. Dtc Check / Clear. Freeze Frame Data

Microphone Circuit

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