Back-Up Light Circuit

LIGHTING SYSTEM: Back-up Light Circuit

Back-up Light Circuit

DESCRIPTION

The HV control ECU receives shift position R signal and controls the back-up light relay. The back-up light relay installed in the power distributor.
System diagram of the power distributor Description and Operation.
System description of the power distributor Description and Operation.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)





(a) Disconnect the connector from the J/B No.2 (power distributor).
(b) Measure the voltage according to the value(s) in the table below.
Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK MODE MONITOR TERMINAL (BACK-UP RELAY)





(a) Preparation
(1) Connect the connector.
(2) Remove the cover of the fusible link block assembly.
(3) Set the vehicle to the following condition.

- Ignition switch ON.
- Shift in R position.
(b) Check voltage
(1) Measure the voltage between the Mode Monitor Terminal and body ground.
Voltage:






C -- CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT DRIVEN SIDE BY RELAY)
B -- INSPECT JUNCTION BLOCK NO.2 (BACK-UP RELAY)
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - MODE MONITOR TERMINAL)





(a) Disconnect the 2G connector from the J/B No.2.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT JUNCTION BLOCK NO.2 (BACK-UP RELAY)
(a) Turn the ignition switch to OFF position.
(b) Remove the J/B No.2.
(c) Inspect the back-up relay.





(1) Connect the positive battery lead to terminal BUB of the J/B No.2 and the negative lead to terminal SGND, PGND.






(2) Measure the voltage according to the value(s) in the table below.
Voltage:






(3) Connect the battery positive lead to terminal BKR of the J/B No.2.






(4) Measure the voltage according to the value(s) in the table below.
Voltage:






NG -- REPLACE JUNCTION BLOCK NO.2
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - HV CONTROL ECU)





(a) Disconnect the connector from the J/B No.2 (power distributor) and HV control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BULB)





(a) Disconnect the connectors from the J/B No.2 (power distributor) and back-up light bulbs.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (BULB - BODY GROUND)





(a) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
8. CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT DRIVEN SIDE BY RELAY)





(a) Preparation
(1) For easier disconnection remove the J/B No.2 and then take apart the connectors.
(2) Disconnect only the connector "2E".
(b) Check voltage
(1) Measure the voltage between the Mode Monitor Terminal and body ground.
Voltage:






B -- REPLACE JUNCTION BLOCK NO.2
A -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SHORT CIRCUIT BETWEEN BACK-UP LIGHT AND J/B NO. 2)