Illumination Circuit

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

PROCEDURE

1. CHECK ILLUMINATION
(a) Check if the illumination for the steering pad switch, radio receiver, glove box, or others (hazard switch, cigarette lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

Result





C -- GO TO LIGHTING SYSTEM
B -- CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER AND BATTERY)
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BATTERY)




(a) Disconnect the R1 receiver 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. CHECK HARNESS AND CONNECTOR (RHEOSTAT - RADIO RECEIVER AND BODY GROUND)




(a) Disconnect the R12 rheostat connector.
(b) Disconnect the R1 receiver 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 CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER AND BATTERY)




(a) Disconnect the C13 cable connector.
(b) Disconnect the R2 receiver connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) 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.
5. INSPECT STEERING PAD SWITCH
(a) Disconnect the A switch connector.




(b) Connect the positive (+) lead to terminal ILL+ (A-1) and the negative (-) lead to terminal EAU (A-10) of the steering pad switch connector.
(c) Check if the illumination for the steering pad switch comes on.

Result





C -- REPLACE STEERING PAD SWITCH
B -- INSPECT STEERING PAD SWITCH CABLE
A -- Continue to next step.
6. INSPECT SPIRAL CABLE




(a) Disconnect the C13 and A cable connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NOTE:
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 PRECAUTION for the supplemental restraint system Service Precautions.

NG -- REPLACE SPIRAL CABLE
OK -- REPLACE RADIO RECEIVER
7. INSPECT STEERING PAD SWITCH CABLE
(a) Disconnect the steering pad switch LH and steering pad RH.




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






NG -- REPLACE STEERING PAD SWITCH CABLE
OK -- REPLACE STEERING PAD SWITCH RH