Subaru Crosstrek Service Manual: Dtc b2274 acc relay control circuit

DTC detecting condition:

When malfunction is detected in ACC relay drive circuit in the keyless access CM or external circuit.

Trouble symptom:

Each function does not operate at the ACC position.

CAUTION:

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

1.CHECK LAN SYSTEM.

Inspect LAN system. Basic Diagnostic Procedure > PROCEDURE">

Is LAN system normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 2.

Perform the inspection according to the diagnosis for LAN system.

2.CHECK FUSE.

Check the fuse. Relay and Fuse">

Is the fuse OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 3.

Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.

3.CHECK HARNESS.

1) Disconnect the keyless access CM connector.

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

Connector & terminal

(B572) No. 2 (+) — Chassis ground (−):

Is the voltage 9.5 — 16 V?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 4.

Check the power supply circuit.

4.CHECK HARNESS.

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

Connector & terminal

(B572) No. 11 — Chassis ground:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 5.

Repair or replace the open circuit of harness.

5.CHECK HARNESS.

1) Disconnect the keyless access CM connector.

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

Connector & terminal

(B574) No. 4 — Chassis ground:

Is resistance 152.61 — 216.5 ?? (20°C)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 7.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 6.

6.CHECK RELAY.

Perform inspection of ACC relay unit. Accessory Relay (Push Button Start)">

Is the relay OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 7.

Replace the relay.

7.CHECK HARNESS.

Using a tester, measure the resistance between the keyless access CM connector and the accessory relay (push button start), and between the accessory relay (push button start) and chassis ground.

Connector & terminal

(B574) No. 4 — (B426) No. 1:

(B426) No. 2 — Chassis ground:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT">Go to Step 8.

Repair or replace the open circuit of harness.

8.CHECK KEYLESS ACCESS CM.

1) Connect the keyless access CM connector.

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

Connector & terminal

(B574) No. 4 (+) — Chassis ground (−):

Is the voltage 1 V or less > 9.5 — 16 V when OFF > ACC ON?

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.

Replace the keyless access CM. Keyless Access CM">

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