Illumination Circuit

NAVIGATION: NAVIGATION SYSTEM: Illumination Circuit
- Illumination Circuit

DESCRIPTION

Power is supplied to the navigation receiver assembly and steering pad switch assembly 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). Before servicing (including removal or installation of parts), be sure to read the precautionary notice for Supplemental Restraint System Service Precautions.

PROCEDURE

1. CHECK ILLUMINATION

(a) Check if the illumination for the navigation receiver assembly, steering pad switch assembly, glove box or others (hazard switch, etc.) comes on when the light control switch is turned to the tail or head position.

Result:





D -- GO TO LIGHTING SYSTEM How To Proceed With Troubleshooting

C -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

B -- CHECK HARNESS AND CONNECTOR (BATTERY - NAVIGATION RECEIVER ASSEMBLY)
A -- Continue to next step.

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

(a) Disconnect the D16 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 SPIRAL CABLE

(a) Disconnect the z2 steering pad switch assembly and D16 spiral cable connectors.





(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. Refer to the pages shown in the brackets.

HINT
* Removal Removal
* Installation Installation

Text in Illustration





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

4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - NAVIGATION RECEIVER ASSEMBLY)

(a) Disconnect the E3 navigation receiver assembly connector.

(b) Disconnect the D16 spiral cable 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 STEERING PAD SWITCH ASSEMBLY

(a) Disconnect the z2 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.





Text in Illustration





(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 Removal

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

6. CHECK HARNESS AND CONNECTOR (BATTERY - NAVIGATION RECEIVER ASSEMBLY)

(a) Disconnect the E2 navigation receiver 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 -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

7. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the E2 navigation receiver assembly connector.

(b) Disconnect the E1 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 -- GO TO METER / GAUGE SYSTEM How To Proceed With Troubleshooting