Illumination Circuit

AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (w/ Daytime Running Light): Illumination Circuit
- 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





INSPECTION PROCEDURE

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 Service Precautions.
* Inspect the fuses for circuits related to this system before performing the following inspection 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:





B -- CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

C -- GO TO METER / GAUGE SYSTEM How To Proceed With Troubleshooting

D -- GO TO LIGHTING SYSTEM How To Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

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

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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Disconnect the steering pad switch assembly connector.

(b) Connect an auxiliary battery positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch assembly connector.





(c) Check if the illumination for the steering pad switch assembly comes on.

OK:

Illumination for the steering pad switch assembly comes on.

Text in Illustration





NG -- REPLACE STEERING PAD SWITCH ASSEMBLY Removal
OK -- Continue to next step.

4. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

(a) Disconnect the steering pad switch assembly connector.

(b) Disconnect the spiral cable with sensor sub-assembly connector.

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





Standard Resistance:





(d) After setting the spiral cable with sensor sub-assembly to the center position, rotate the spiral cable with sensor sub-assembly 2.5 times clockwise. Then while rotating the spiral cable with sensor sub-assembly 5 times counterclockwise, measure the resistance as shown in the table below.

Standard Resistance:





NOTICE:
* The spiral cable with sensor sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable with sensor sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.
* As the spiral cable with sensor sub-assembly may break, do not rotate the spiral cable with sensor sub-assembly more than the specified amount.

HINT
* Removal Removal
* Installation Installation

Text in Illustration





NG -- REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Removal
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

(b) Disconnect the radio and display receiver assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

6. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

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

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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 3 METER CIRCUIT PLATE)

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

(b) Disconnect the No. 3 meter circuit plate connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table