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">

Dtc b2271 ign relay control circuit

Dtc b2275 engine start request control circuit

Other materials:

Disabling keyless access function
WARNING If you use an implanted pacemaker or defibrillator, it is strongly recommended to disable the Subaru Ascent keyless access function by following the procedure described in the section "By operating the driver's door". Avoid disabling the system via the access key fob, as ...

Dtc b2801 tcm abnormal
EyeSight (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC B2801 TCM ABNORMALDetected when error occurs in the automatic transmission.When lost communication with TCM and TCM abnormal occur simultaneously, perform diagnosis for lost communication with TCM first.NOTE:Check ...

Activation of malfunction indicator light
ENGINE (DIAGNOSTICS)(H4DO) > Malfunction Indicator LightACTIVATION OF MALFUNCTION INDICATOR LIGHT1. When the ignition switch is turned to ON (engine OFF), the malfunction indicator light (A) in the combination meter illuminates.NOTE:If the malfunction indicator light does not illuminate, perform ...