Illumination Circuit

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Illumination Circuit

Illumination Circuit

DESCRIPTION

Power is supplied to the radio receiver, integration control & panel assembly and steering pad switch assembly 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 Service Precautions.

PROCEDURE

1. CHECK ILLUMINATION
(a) Check if the illumination for the radio receiver, steering pad switch, integration control & panel assembly, cigarette lighter or others (seat heater switch, hazard switch, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.
Result:






E -- GO TO COMBINATION METER SYSTEM
D -- GO TO LIGHTING SYSTEM
C -- CHECK HARNESS AND CONNECTOR (BATTERY - INTEGRATION CONTROL & PANEL ASSEMBLY)
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 assembly connector.
(b) Connect the positive (+) lead to terminal IL+2 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 steering pad switch assembly and spiral 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 page shown in the brackets.
HINT:
- Removal Removal
- Installation Installation

NG -- REPLACE SPIRAL CABLE
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 -- REPLACE RADIO RECEIVER
6. CHECK HARNESS AND CONNECTOR (BATTERY - RADIO RECEIVER)




(a) Disconnect the radio receiver connector J66.
(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 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 -- REPLACE RADIO RECEIVER
8. CHECK HARNESS AND CONNECTOR (BATTERY - INTEGRATION CONTROL & PANEL ASSEMBLY)




(a) Disconnect the integration control & panel assembly connector J54.
(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.
9. CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL & PANEL ASSEMBLY - COMBINATION METER)




(a) Disconnect the integration control & panel assembly connector and 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 -- REPLACE INTEGRATION CONTROL & PANEL ASSEMBLY