DTC P0957 Backup Light Relay Circuit Low

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Short circuit of back-up light relay output circuit

TROUBLE SYMPTOM:

Back-up light does not illuminate in "R" range.

WIRING DIAGRAM:

Fig 1: Backup Light Relay - Wiring Diagram

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC OF TCM.	Is DTC of Transmission Range Sensor Circuit (PRNDL Input) detected?	Perform the diagnosis according to DTC.	Go to step 2.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND BACK-UP LIGHT RELAY. Turn the ignition switch to OFF. Disconnect the connector from TCM and back-up light relay. Measure the resistance of harness between TCM connector and back-up light relay connector. Connector & terminal (B55) No. 11 - (B356) No. 2:	Is the resistance less than 1 Ω?	Go to step 3.	Repair the open circuit of harness between TCM and transmission connector, or poor contact of connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 11 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 4.	Repair the short circuit of harness between TCM and transmission connector.
4 CHECK TCM OUTPUT SIGNAL. Turn the ignition switch to ON. (engine OFF) Move the select lever to "P" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B55) No. 11 - Chassis ground:	Is the voltage more than 10 V?	Go to step 5.	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
5 CHECK TCM OUTPUT SIGNAL. Set the select lever to "R" range. Is the voltage less than 1 V? Measure the voltage between TCM connector and chassis ground. Connector & terminal (B55) No. 11 - Chassis ground:	Is the voltage 1.0 - 2.0 V?	Go to step 6.	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
6 CHECK INPUT VOLTAGE FOR BACK-UP LIGHT RELAY. Measure the voltage between back-up light relay and chassis ground.	Is the voltage 10 - 13 V?	Replace the backup light relay.	Check open or short circuit of harness between fuse (No. 18) and backup light relay.