Subaru Crosstrek Service Manual: Dtc b2782 steering lock drive request signal correlation

DTC detecting condition:

When the open or short circuit in the steering lock motor power supply circuit is detected.

Trouble symptom:

• The steering lock cannot be released.

• Engine will not start.

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 STEERING LOCK CM.

1) Disconnect the steering lock CM connector.

2) 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 B2782 STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION">Go to Step 2.

Repair or replace the open circuit of harness.

2.CHECK STEERING LOCK CM.

1) Connect the steering lock CM connector.

2) Set to ACC OFF, IGN OFF, and shift position P.

3) Using a tester, open the door, and measure the voltage between terminals of steering CM connector when the steering lock motor is driven.

Connector & terminal

(B424) No. 3 (+) — (B424) No. 1 (−):

Does the voltage change as follows? 1 V or less (steering lock motor in operation) > 11 — 14 V (steering lock motor not in operation)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2782 STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION">Go to Step 3.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2782 STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION">Go to Step 4.

3.CHECK DTC.

1) Turn the ignition switch to ON.

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

3) Turn the ignition switch to OFF.

4) Disconnect the battery ground cable and reconnect it, and then clear the abnormal information displayed on the data monitor.

5) Turn the ignition switch to ON.

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

Is DTC B2782 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.

4.CHECK CONNECTOR.

1) Disconnect the steering lock CM connector.

2) Disconnect the keyless access CM connector.

Are connectors normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2782 STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION">Go to Step 5.

Repair or replace the connector.

5.CHECK HARNESS.

Using a tester, measure the resistance between steering lock CM connector and keyless access CM connector.

Connector & terminal

(B574) No. 29 — (B424) No. 3:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2782 STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION">Go to Step 6.

Repair or replace the open circuit of harness.

6.CHECK HARNESS.

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

Connector & terminal

(B424) No. 3 — Chassis ground:
(B574) No. 29 — Chassis ground:

Is the resistance 10 k? or more?

Replace the keyless access CM. Keyless Access CM">

Repair or replace the short circuit of the harness.

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