Illumination Circuit

NAVIGATION: NAVIGATION SYSTEM (for DVD): Illumination Circuit
- Illumination Circuit

DESCRIPTION

Power is supplied to the display and navigation module display, radio receiver and steering pad switch illumination when the light control switch is in the TAIL or HEAD position.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* 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 in the Supplemental Restraint System Service Precautions.

PROCEDURE

1. CHECK ILLUMINATION

(a) Check if the illumination for the display and navigation module display, steering pad switch assembly, radio receiver assembly, glove box light, cigarette lighter, or others (seat heater switch, front seat memory switch, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

Result





D -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER AND BATTERY)

C -- GO TO LIGHTING SYSTEM Problem Symptoms Table

B -- CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - BATTERY AND COMBINATION METER)
A -- Continue to next step.

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

(a) Disconnect the L126 spiral cable sub-assembly connector.

(b) Disconnect the L10 combination meter assembly connector.

(c) Measure the resistance and voltage according to the value(s) in the table below.

Standard Resistance:





Standard Voltage:





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

3. CHECK STEERING PAD SWITCH ASSEMBLY (STEERING PAD SIDE)

(a) Remove the steering pad switch assembly (steering pad side) Removal.





(b) Connect the positive (+) lead to terminal 2 (ILL+-1) and the negative (-) lead to terminal 5 (ILL--1) 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 ASSEMBLY (STEERING PAD SIDE) Removal
OK -- Continue to next step.

4. INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly Removal.





Text in Illustration





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

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 Removal

OK -- REPLACE STEERING PAD SWITCH ASSEMBLY (STEERING WHEEL SIDE) Removal

5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER AND BATTERY)

(a) Disconnect the L130 radio receiver assembly connector.

(b) Disconnect the L10 combination meter assembly 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 -- REPLACE RADIO RECEIVER ASSEMBLY Removal

6. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - BATTERY AND COMBINATION METER)

(a) Disconnect the L132 and L136 display and navigation module display connectors.

(b) Disconnect the L10 combination meter assembly connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table