Shift Illumination Circuit

LIGHTING: LIGHTING SYSTEM: Shift Illumination Circuit
- Shift Illumination Circuit

DESCRIPTION

The turning on and off of the shift illumination is controlled by the main body ECU LH based on various signals received through BEAN communication.

The main body ECU LH includes a MOS-FET (Metal Oxide Semiconductor - Field Effect Transistor) circuit that fades the shift illumination in and out by duty control.

This MOS-FET circuit has an overheat protection function as a fail-safe. If the main body ECU LH becomes excessively hot, the shift illumination turns off and remains off.

Normal operation will resume when the conditions required to turn on the shift illumination are met again.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK PERSONAL LIGHT (OPERATION)

HINT
The personal lights and shift illumination share the same power source circuit. Therefore, if none of them come on, inspect the power source circuit first.

(a) Push the switches for the personal lights.

(b) Check that the personal lights come on.

OK:

Personal lights come on.

NG -- CHECK HARNESS AND CONNECTOR (POWER SOURCE)
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Body No. 3 / Active Test.

(e) Check the operation.

Body No. 3 (Main Body ECU LH):





OK:

The shift illumination comes on.

NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD J/B)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD J/B)

(a) Disconnect the Q1 main body ECU LH connector.





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

Standard voltage:





NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD J/B)

OK -- REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH)

4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD J/B)

(a) Disconnect the Q1 main body ECU LH connector.





(b) Disconnect the R5 overhead J/B connector

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE OVERHEAD J/B

5. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Disconnect the R5 overhead J/B connector





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE OVERHEAD J/B