DTC B2788 IGN SIGNAL CORRELATION (STEERING LOCK CM (Control Module)): Wiring Diagram

Push button start system wiring diagram. Refer to appropriate SYSTEM WIRING DIAGRAMS article.

Engine type: FA

Fig 1: Push Button Start System Wiring Diagram (Engine Type FA)
Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Fig 2: Push Button Start System Wiring Diagram (Engine Type EJ)
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK FUSE. Check the fuse. < Ref. to RELAY AND FUSE . >	Is the fuse OK?	Go to step 2.	Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
2 CHECK CURRENT DATA. Check the current data display of keyless access CM (Control Module) using the Subaru Select Monitor. < Ref. to READ CURRENT DATA . > IGN SW	Is the display normal according to the ignition switch operation?	Go to step 3.	Go to step 5.
3 CHECK HARNESS. Disconnect the steering lock CM (Control Module) connector. Using a tester, measure the resistance between the steering lock CM (Control Module) connector and chassis ground. Connector & terminal (B424) No. 1 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 4.	Repair or replace the open circuit of harness.
4 CHECK HARNESS. Connect the steering lock CM (Control Module) connector. Using the tester, measure the voltage between terminals. Connector & terminal (B424) No. 6 (+) - (B424) No. 1 (-):	Is the voltage 11 - 14 V with IG ON? Is the voltage less than 1 V with IG OFF?	Replace the steering lock CM (Control Module). < Ref. to REMOVAL , Steering Lock CM (Control Module). >	Check the DC power supply circuit.
5 CHECK HARNESS. Using a tester, measure the voltage between the keyless access CM (Control Module) connector and chassis ground. Connector & terminal (B574) No. 5 (+) - Chassis ground (-):	Is the voltage 11 - 14 V with IG ON? Is the voltage less than 1 V with IG OFF?	Replace the keyless access CM (Control Module). < Ref. to REMOVAL , Keyless Access CM (Control Module). >	Check the DC power supply circuit.