Illumination Circuit

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Illumination Circuit

Illumination Circuit

DESCRIPTION

Power is supplied to the radio receiver, multi-display 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 airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the supplemental restraint system.

PROCEDURE

1. CHECK ILLUMINATION
(a) Check if the illumination for the radio receiver, steering pad switch, multi-display and other illuminations (hazard switch, etc.) come on when the light control switch is turned to the HEAD or TAIL position.

Result





D -- GO TO METER / GAUGE SYSTEM
C -- CHECK WIRE HARNESS (BATTERY - MULTI-DISPLAY)
B -- CHECK WIRE HARNESS (BATTERY - RADIO RECEIVER)
A -- Continue to next step.

2. CHECK WIRE HARNESS (BATTERY - SPIRAL CABLE)




(a) Disconnect the C12 cable connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






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

3. INSPECT STEERING PAD SWITCH




(a) Disconnect the steering pad switch connector.
(b) Connect the battery's positive (+) lead to terminal 5 (ILL+) and the negative (-) lead to terminal 8 (EAU) of the steering pad switch connector.
(c) Check if the illumination for the steering pad switch comes on.
OK:
Illumination for the steering pad switch comes on.
NG -- REPLACE STEERING PAD SWITCH
OK -- Continue to next step.

4. INSPECT SPIRAL CABLE




(a) Disconnect the steering pad switch connector.
(b) Disconnect the spiral cable connector.
(c) Measure the resistance of the cable.
Standard resistance:





NOTE: The spiral cable is an important part of the SRS. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the SRS section's precaution.

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

5. CHECK WIRE HARNESS (SPIRAL CABLE - RADIO RECEIVER)




(a) Disconnect the R5 receiver connector.
(b) Disconnect the C12 cable connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE RADIO RECEIVER
6. CHECK WIRE HARNESS (BATTERY - RADIO RECEIVER)




(a) Disconnect the R3*1 or R6*2 receiver connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:





(c) Measure the resistance of the wire harness side connectors.
Standard resistance:





HINT:
- *1: for 6 speaker system
- *2: for 9 speaker system

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE RADIO RECEIVER
7. CHECK WIRE HARNESS (BATTERY - MULTI-DISPLAY)




(a) Disconnect the M13 display connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:





(c) Measure the resistance of the wire harness side connector.
Standard resistance:





HINT:
- *1: for 3 connector type
- *2: for 4 connector type

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE MULTI-DISPLAY