Illumination Circuit

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Illumination Circuit

Illumination Circuit

DESCRIPTION

Power is supplied to the multi-display 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 PRECAUTION for the supplemental restraint system Service Precautions.

PROCEDURE

1. CHECK WIRE HARNESS (SPIRAL CABLE - BATTERY)




(a) Disconnect the K20 cable connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK STEERING PAD SWITCH ASSEMBLY




(a) Disconnect the switch connector.
(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 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 ASSEMBLY
OK -- Continue to next step.
3. INSPECT SPIRAL CABLE




(a) Disconnect the cable connectors.
(b) Measure the resistance of the cable.
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 PRECAUTION for the supplemental restraint system Service Precautions.

NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- Continue to next step.
4. CHECK WIRE HARNESS (RADIO RECEIVER - BATTERY)




(a) Disconnect the K54 radio connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK WIRE HARNESS (RADIO RECEIVER - SPIRAL CABLE AND COMBINATION METER)
(a) Disconnect the K56 and K54 receiver connectors.




(b) Disconnect the K20 cable connector.
(c) Disconnect the K31 meter connector.
(d) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK WIRE HARNESS (MULTI-DISPLAY - BATTERY AND COMBINATION METER)




(a) Disconnect the K46 display connector.
(b) Disconnect the K31 meter connector.
(c) Measure the voltage and resistance of the wire harness side connectors.
Standard voltage:
Standard resistance










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE