Illumination Circuit

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (for HDD): Illumination Circuit
- Illumination Circuit

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Inspect the fuse 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 steering pad switch assembly, multi-display switch, glove box or others (hazard switch, etc.) comes on when the light control switch is turned to the tail or head position.

Result:





B -- INSPECT MULTI-DISPLAY SWITCH (MULTI-DISPLAY SWITCH ILLUMINATION)

C -- GO TO LIGHTING SYSTEM How To Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the H30 spiral with sensor 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 WITH SENSOR CABLE SUB-ASSEMBLY

(a) Disconnect the z4 steering pad switch assembly and H30 spiral with sensor cable sub-assembly connectors.





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

Standard Resistance:





(c) After setting the spiral with sensor cable sub-assembly to the center position, rotate the spiral with sensor cable sub-assembly 2.5 times clockwise. Then while rotating the spiral with sensor cable as shown in the table below.

Standard Resistance:





NOTICE:
* The spiral with sensor cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral with sensor cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.
* As the spiral with sensor cable may break, do not rotate the spiral with sensor cable sub-assembly more than the specified amount.

HINT
* Removal Removal
* Installation Installation

Text in Illustration





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

4. CHECK HARNESS AND CONNECTOR

(a) Disconnect the H60 display and navigation module display connector.

(b) Disconnect the H30 spiral with sensor 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 NAVIGATION COMPUTER SUB-ASSEMBLY

(a) Disconnect the H60 navigation computer sub-assembly connector.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY Removal
OK -- Continue to next step.

6. INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Disconnect the z4 steering pad switch assembly connector.

(b) Check that the steering pad switch assembly illuminates according to the table below.





OK:





Text in Illustration





NG -- REPLACE STEERING PAD SWITCH ASSEMBLY Removal

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

7. INSPECT MULTI-DISPLAY SWITCH (MULTI-DISPLAY SWITCH ILLUMINATION)

(a) Disconnect the H89 multi-display switch connector.





(b) Connect a positive (+) lead to terminal ILL+ and a negative (-) lead from the auxiliary battery to terminal ILL- of the multi-display switch connector.

(c) Check that the multi-display switch illumination comes on.

OK:

Multi-display switch illumination comes on.

Text in Illustration





NG -- REPLACE MULTI-DISPLAY SWITCH Removal
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the H89 multi-display switch 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.

9. CHECK HARNESS AND CONNECTOR

(a) Disconnect the H89 multi-display switch connector.

(b) Disconnect the H19 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