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Illumination Circuit





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

DESCRIPTION

Power is supplied to the steering pad switch assembly and display and navigation module display illumination when the light control switch is in the tail or head position.

The display and navigation module display is connected to the combination meter assembly. The panel switch illumination for the display and navigation module display is controlled by the rheostat switch.

HINT
If a malfunction occurs in the rheostat switch circuit, the rheostat switch controlled illumination for the display and navigation module display panel switches and other panel switches may not function correctly.

WIRING DIAGRAM







NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* The vehicle is equipped with a Supplemental Restraint System (SRS). Before servicing (including removal or installation of parts), be sure to read Precaution for 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, hazard switch, glove box or others (engine switch, etc.) comes on when the light control switch is turned to the tail or head position.

Result:





HINT
If a malfunction occurs in the rheostat switch circuit, the rheostat switch controlled illumination for the display and navigation module display panel switches and other panel switches may not function correctly.

E -- GO TO METER / GAUGE SYSTEM How To Proceed With Troubleshooting

D -- GO TO LIGHTING SYSTEM

C -- CHECK HARNESS AND CONNECTOR

B -- CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the K20 spiral cable sub-assembly 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 SPIRAL CABLE SUB-ASSEMBLY

(a) Disconnect the steering pad switch assembly and spiral cable sub-assembly connectors.





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

Standard Resistance:





NOTICE:
The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.

HINT
* Removal Removal
* Installation Installation

Text in Illustration





NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR

(a) Disconnect the K46 display and navigation module display connector.

(b) Disconnect the K20 spiral cable sub-assembly connector.

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

Standard Resistance:





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

5. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY

(a) Disconnect the K46 display and navigation module display connector.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
OK -- Continue to next step.

6. INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Disconnect the S30 steering pad switch assembly connector.

(b) Connect a positive (+) lead from the battery to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch assembly connector.





(c) Check that the switch illumination comes on.

OK:

Steering pad switch illumination comes on.

Text in Illustration





NG -- REPLACE STEERING PAD SWITCH ASSEMBLY

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

7. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the K46 display and navigation module display 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.

8. CHECK HARNESS AND CONNECTOR

(a) Disconnect the K46 display and navigation module display connector.

(b) Disconnect the K31 combination meter assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

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

9. CHECK HARNESS AND CONNECTOR

(a) Disconnect the K99 display and navigation module display connector.

(b) Disconnect the K31 combination meter assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

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