Illumination Circuit

AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Illumination Circuit
- Illumination Circuit

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

CAUTION:
The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS Service Precautions.

PROCEDURE

1. CHECK ILLUMINATION

(a) Check if the illumination for the radio receiver assembly, steering pad switch, glove box or other parts (hazard switch, transmission control switch, etc.) come on when the light control switch is turned to the HEAD or TAIL position.

Result





D -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER)

C -- GO TO LIGHTING SYSTEM How To Proceed With Troubleshooting

B -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BATTERY)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - BATTERY)

(a) Disconnect the H54 spiral cable 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) Remove the steering pad switch assembly connector Removal.





(b) Connect the positive (+) lead of the battery to terminal 5 (IL+2) and the negative (-) lead of the battery to terminal 8 (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.

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

4. INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly Removal.





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

Standard Resistance:





CAUTION:
The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read Precaution in the SRS Service Precautions.

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

5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - SPIRAL CABLE)

(a) Disconnect the I3 radio receiver assembly connector.





(b) Disconnect the H54 spiral cable sub-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 (RADIO RECEIVER - BATTERY)

(a) for 8 Speakers:

(1) Disconnect the I1 radio receiver assembly connector.





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

Standard Voltage:





(b) for 14 Speakers:

(1) Disconnect the I4 radio receiver assembly connector.





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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

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

7. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER)

(a) for 8 Speakers:

(1) Disconnect the I2 radio receiver assembly connector.





(2) Disconnect the H37 combination meter assembly connector.

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

Standard Resistance:





(b) for 14 Speakers:

(1) Disconnect the I4 radio receiver assembly connector.





(2) Disconnect the H37 combination meter assembly connector.

(3) 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