Illumination Circuit

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

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
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 precautionary notice for Supplemental Restraint System Service Precautions.

PROCEDURE

1. CHECK ILLUMINATION

(a) Check if the illumination for the radio receiver, steering pad switch, 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:





D -- GO TO METER / GAUGE SYSTEM Problem Symptoms Table

C -- GO TO LIGHTING SYSTEM Interior Lighting System

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

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

(a) Disconnect the spiral cable 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 connector.

(b) Connect a 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.

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

4. INSPECT SPIRAL CABLE

(a) Disconnect the steering pad switch and the spiral cable connectors.





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

Standard Resistance:





NOTICE:
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 the page shown in the brackets.

HINT
* Removal Removal
* Installation Installation

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

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

(a) Disconnect the connectors from the radio receiver and spiral cable.





(b) 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 CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

6. CHECK HARNESS AND CONNECTOR (BATTERY - RADIO RECEIVER)

(a) Disconnect the radio receiver connector.





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

Standard Voltage:





* *1: for 8 Speakers

* *2: Except for 8 Speakers

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

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

(a) Disconnect the radio receiver connector and the combination meter connector.





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

Standard Resistance:





* *1: for 8 Speakers

* *2: Except for 8 Speakers

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table