DTC P0958 Backup Light Relay Circuit High: Wiring Diagram

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

AT Control System. Refer to appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: AT Control System - Wiring Diagram (Backup Light Relay)

Courtesy of SUBARU OF AMERICA, INC.

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 Without push button start (B54) No. 13 - (B499) No. 1: With push button start (B54) No. 13 - (B225) No. 8:	Is the resistance less than 1 Ω?	Go to step 3 .	Repair the open circuit of the harness or poor contact of the connector between TCM and back-up light relay connector.
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B54) No. 13 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4 .	Repair the short circuit of the harness between TCM and back-up light relay connector.
4 CHECK OUTPUT SIGNAL OF TCM. Turn the ignition switch to ON. Shift the select lever to "P" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 13 (+) - Chassis ground (-):	Is the voltage 8 V or more?	Go to step 5 .	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .
5 CHECK OUTPUT SIGNAL OF TCM. Set the select lever to "R" range. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 13 (+) - Chassis ground (-):	Is the voltage 1 V or less?	Go to step 6 .	Replace the TCM. Refer 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.