Back-Up Light Circuit

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

DESCRIPTION

The hybrid vehicle control ECU receives the shift lever position sensor R signal to control the back-up light relay.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (GAUGE NO. 1)

(a) Remove the GAUGE NO. 1 fuse from the instrument panel junction block.

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

Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

2. INSPECT BACK-UP LIGHT RELAY (BK/UP LP)

(a) Remove the back-up light relay from the engine room No. 2 relay block.





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

Standard resistance:





NG -- REPLACE BACK-UP LIGHT RELAY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT RELAY - HYBRID VEHICLE CONTROL ECU AND BODY GROUND)

(a) Disconnect the A65 hybrid vehicle control ECU connector.





(b) Remove the back-up light relay from the engine room No. 2 relay block.

(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.

4. CHECK HYBRID VEHICLE CONTROL ECU

(a) Remove the hybrid vehicle control ECU with its connectors still connected.

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





Standard voltage:





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

5. CHECK HARNESS AND CONNECTOR (BATTERY - BACK-UP LIGHT RELAY)

(a) Remove the back-up light relay from the engine room No. 2 relay block.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - BACK-UP LIGHT RELAY)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BULB - BACK-UP LIGHT RELAY AND BODY GROUND)