Illumination Circuit

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Illumination Circuit
- Illumination Circuit

DESCRIPTION

Power is supplied to the steering pad switch assembly and telltale light assembly (multi-display 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 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, telltale light 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:





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

B -- INSPECT TELLTALE LIGHT ASSEMBLY (MULTI-DISPLAY SWITCH ILLUMINATION)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the F19 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 steering pad switch assembly and spiral with sensor cable sub-assembly connectors.





(b) Measure the resistance according to the value(s) 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.

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 F30 display and navigation module display connector.

(b) Disconnect the F19 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 DISPLAY AND NAVIGATION MODULE DISPLAY

(a) Disconnect the F30 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 z33 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 Removal

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

1. INSPECT TELLTALE LIGHT ASSEMBLY (MULTI-DISPLAY SWITCH ILLUMINATION)

(a) Disconnect the F74 telltale light assembly connector.





(b) Connect a positive (+) lead to terminal ILL+ and a negative (-) lead from the battery to terminal ILL- of the telltale light assembly connector.

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

OK:

Multi-display switch illumination comes on.

Text in Illustration





NG -- REPLACE TELLTALE LIGHT ASSEMBLY Removal
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the F74 telltale light 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. CHECK HARNESS AND CONNECTOR

(a) Disconnect the F74 telltale light assembly connector.

(b) Disconnect the F4 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 Meter / Gauge System