Illumination Circuit

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Illumination Circuit

Illumination Circuit

DESCRIPTION

Receiving a dimmer signal from the light control switch, the radio receiver dims the display and illuminates the panel switches and the steering pad switch.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: The vehicle is equipped with an SRS (Supplemental Restraint System). Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the Supplemental Restraint System Service Precautions.

PROCEDURE

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





D -- GO TO COMBINATION METER SYSTEM
C -- GO TO LIGHTING SYSTEM
B -- INSPECT RADIO RECEIVER
A -- Continue to next step.

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





(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 assembly connector.





(b) Connect the positive (+) lead to terminal ILL+ and the 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
OK -- Continue to next step.

4. INSPECT SPIRAL CABLE





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






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

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





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE RADIO RECEIVER
6. INSPECT RADIO RECEIVER





(a) Disconnect the radio 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.

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:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- GO TO COMBINATION METER SYSTEM