Subaru Crosstrek Service Manual: Dtc b2786 steering lock cm communication

DTC detecting condition:

When communication between keyless access CM and steering lock CM is interrupted for a set amount of time.

Trouble symptom:

The steering lock cannot be released.

CAUTION:

For replacement procedure of keyless access CM and steering lock CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

1.CHECK DTC.

Read the DTC using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is a DTC other than DTC B2786 displayed?

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2786 STEERING LOCK CM COMMUNICATION">Go to Step 2.

2.CHECK HARNESS (OPEN CIRCUIT).

1) Disconnect the keyless access CM connector.

2) Disconnect the steering lock CM connector.

3) Using the tester, measure the resistance between terminals.

Connector & terminal

(B574) No. 17 — (B424) No. 5:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2786 STEERING LOCK CM COMMUNICATION">Go to Step 3.

Repair or replace the open circuit of harness.

3.CHECK HARNESS (GROUND SHORT CIRCUIT).

Using the tester, measure the resistance between terminals.

Connector & terminal

(B574) No. 17 — Chassis ground:

Is the resistance 10 k? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2786 STEERING LOCK CM COMMUNICATION">Go to Step 4.

Repair or replace the short circuit of the harness.

4.CHECK HARNESS (OPEN CIRCUIT).

Using a tester, measure the resistance between the steering lock CM connector and chassis ground.

Connector & terminal

(B424) No. 1 — Chassis ground:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2786 STEERING LOCK CM COMMUNICATION">Go to Step 5.

Repair or replace the open circuit of harness.

5.CHECK HARNESS.

1) Turn the ignition switch to ON.

2) Using a tester, measure the voltage between the steering lock CM connector and chassis ground.

Connector & terminal

(B424) No. 6 (+) — Chassis ground (−):
(B424) No. 7 (+) — Chassis ground (−):

Is the voltage 11 — 14 V?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2786 STEERING LOCK CM COMMUNICATION">Go to Step 6.

Repair or replace the faulty portion of the power supply circuit.

6.CHECK STEERING LOCK CM.

1) Turn the ignition switch to ON.

2) Using the Subaru Select Monitor, clear the memory. Clear Memory Mode">

3) Read the DTC using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is DTC B2785 displayed?

Replace the keyless access CM. Keyless Access CM">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2786 STEERING LOCK CM COMMUNICATION">Go to Step 7.

7.CHECK STEERING LOCK CM.

1) Turn the ignition switch to ON.

2) Using the Subaru Select Monitor, clear the memory. Clear Memory Mode">

3) Read the DTC using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is DTC B2786 displayed?

Replace the steering lock CM. Steering Lock CM">

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.

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