Subaru Crosstrek Service Manual: Dtc b2785 lin communication

DTC detecting condition:

When the keyless access CM detected the collation system LIN bus communication error three times in a row.

Trouble symptom:

The keyless access function may not be operable.

CAUTION:

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

1.CHECK DTC.

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

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

Is DTC B2785 displayed?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2785 LIN COMMUNICATION">Go to Step 2.

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.

2.CHECK HARNESS (OPEN CIRCUIT).

1) Disconnect the keyless access CM connector.

2) Disconnect the steering lock CM connector.

3) Disconnect the ID code box connector. (With ID code box)

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

Connector & terminal

(B574) No. 17 — (B424) No. 5:

(B574) No. 17 — (B422) No. 2: (with ID code box)

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2785 LIN 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

(B424) No. 5 — Chassis ground:
(B574) No. 17 — Chassis ground:
(B422) No. 5 — Chassis ground: (with ID code box)

Is the resistance 10 k? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2785 LIN COMMUNICATION">Go to Step 4.

Repair or replace the short circuit of the harness.

4.CHECK HARNESS.

1) Connect the keyless access CM connector only.

2) 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 B2785 LIN COMMUNICATION">Go to Step 5.

5.CHECK ID CODE BOX.

NOTE:

For model without ID code box, go to the next step.

1) Connect the ID code box.

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

Is DTC B2785 displayed?

Replace the ID code box. ID Code Box">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2785 LIN COMMUNICATION">Go to Step 6.

6.CHECK STEERING LOCK CM.

1) Connect the steering lock CM. Steering Lock CM">

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 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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