DTC B2786: Steering Lock Control Module Communication: Wiring diagram

Keyless access with push button start system. Ref. to WIRING SYSTEM>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

For replacement procedure of keyless access Control Module and steering lock Control Module, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.
Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK DTC .
Read the DTC of [Keyless Access with Push Button Start] using the Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Are DTCs other than DTC B2786 displayed? (Current malfunction)

Yes : Perform the diagnosis of DTCs other than B2786. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

No : Go to 2 .
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the keyless access Control Module connector.
2. Disconnect the steering lock Control Module connector.
3. Using the tester, measure the resistance between terminals.
Connector & terminal

(i241) No. 20 - (i47) No. 5:

Is the resistance less than 1 Ω?

Yes : Go to 3 .

No : Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Using a tester, measure the resistance between the keyless access Control Module and chassis ground.

Connector & terminal

(i241) No. 20 - Chassis ground:

Is the resistance 10 kΩ or more?

Yes : Go to 4 .

No : Repair or replace the short circuit of the harness.
CHECK HARNESS (OPEN CIRCUIT) .
Using a tester, measure the resistance between the steering lock Control Module connector and chassis ground.

Connector & terminal

(i47) No. 1 - Chassis ground:

Is the resistance less than 1 Ω?

Yes : Go to 5 .

No : Repair or replace the open circuit of harness.
CHECK HARNESS .
1. Turn the ignition switch to ON.
2. Using a tester, measure the voltage between the steering lock Control Module connector and chassis ground.
  Connector & terminal
  
  (i47) No. 6 (+) - Chassis ground (-):
  
  (i47) No. 7 (+) - Chassis ground (-):
  
  Is the voltage 11 - 14 V?
  
  Yes : Go to 6 .
  
  No : Repair or replace the faulty portion of the power supply circuit.
CHECK STEERING LOCK CONTROL MODULE .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, perform the clear memory of [Keyless Access with Push Button Start]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
3. Read the DTC of [Keyless Access with Push Button Start] using the Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B2785 displayed?

Yes : Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .

No : Go to 7 .
CHECK STEERING LOCK CONTROL MODULE .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, perform the clear memory of [Keyless Access with Push Button Start]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
3. Read the DTC of [Keyless Access with Push Button Start] using the Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B2786 displayed? (Current malfunction)

Yes : Replace the steering lock Control Module. Ref. to SECURITY AND LOCKS>STEERING LOCK CONTROL MODULE .

No : Even if DTC is displayed, the circuit has returned to a normal condition at this time.

Reproduce the failure, and then perform the diagnosis again.

NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.