Back-Up Light Circuit

LIGHTING: LIGHTING SYSTEM: Back-up Light Circuit
- Back-up Light Circuit

DESCRIPTION

The back-up light turns on by receiving the park / neutral position switch signal (shift position R signal) from the rear multiplex network ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (BACK - UP LIGHT)

(a) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the back-up light illuminates.

Body No. 4 (Rear multiplex network ECU)





OK:

Back-up light illuminates.

NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (SHIFT POSITION)

(a) Check the DATA LIST for proper functioning of the park / neutral position switch.

Hybrid Control





NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.

3. REPLACE BACK-UP LIGHT BULB

(a) Temporarily replace the back-up light bulb with a new or normally functioning one.

(b) Check that light bulb illuminates.

OK:

Back-up light bulb illuminates.

OK -- END
NG -- Continue to next step.

4. CHECK WIRE HARNESS (ECU - LIGHT AND BODY GROUND)

(a) Check the wire harness between the rear combination light (back-up LH) and rear multiplex network ECU, and the rear combination light (back-up LH) and body ground.





(1) Disconnect the Y2 light connector.

(2) Disconnect the LA ECU connector.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:





(4) Connect the LA ECU connector.

(5) Measure the resistance of the wire harness side connector.

Standard resistance:





(b) Check the wire harness between the rear combination light (back-up RH) and rear multiplex network ECU, and the rear combination light (back-up RH) and body ground.





(1) Disconnect the Y9 light connector.

(2) Disconnect the LA ECU connector.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:





(4) Connect the LA ECU connector.

(5) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

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