Subaru Crosstrek Service Manual: Dtc b27a1 driver side external antenna open

DTC detecting condition:

When open circuit occurs in the harness between keyless access CM and driver’s side front door outer handle.

Trouble symptom:

Keyless access system does not function.

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 B27A1 DRIVER SIDE EXTERNAL ANTENNA OPEN">Go to Step 2.

Perform the inspection according to the diagnosis for LAN system.

2.CHECK CONNECTOR.

1) Disconnect the keyless access CM connector.

2) Disconnect the front door outer handle connector.

Is the connector OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B27A1 DRIVER SIDE EXTERNAL ANTENNA OPEN">Go to Step 3.

Repair or replace the connector.

3.CHECK HARNESS (OPEN CIRCUIT).

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

Connector & terminal

(B574) No. 12 — (D66) No. 6:
(B574) No. 13 — (D66) No. 3:
(D66) No. 2 — Chassis ground:
(B572) No. 11 — Chassis ground:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B27A1 DRIVER SIDE EXTERNAL ANTENNA OPEN">Go to Step 4.

Repair or replace the open circuit of harness.

4.CHECK HARNESS (GROUND SHORT CIRCUIT).

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

Connector & terminal

(B574) No. 12 — Chassis ground:
(B574) No. 13 — Chassis ground:

Is the resistance 10 k? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B27A1 DRIVER SIDE EXTERNAL ANTENNA OPEN">Go to Step 5.

Repair or replace the short circuit of the harness.

5.CHECK DTC.

1) Connect the keyless access CM connector.

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

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

Is DTC B27A1 displayed?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B27A1 DRIVER SIDE EXTERNAL ANTENNA OPEN">Go to Step 6.

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.

6.CHECK FRONT DOOR OUTER HANDLE.

1) Replace the driver’s side front door outer handle with the passenger’s front door outer handle. Front Outer Handle">

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

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

Is DTC B27A1 displayed?

Replace the keyless access CM. Keyless Access CM">

Replace the driver’s side front door outer handle. Front Outer Handle">

Dtc b278d id code box judgment circuit

Dtc b27a2 passenger side external antenna open

Other materials:

Symbols in wiring diagrams
WIRING SYSTEM > Basic Diagnostic ProcedureSYMBOLS IN WIRING DIAGRAMSA number of symbols are used in each wiring diagram to easily identify parts or circuits.1. RELAYA symbol used to indicate a relay.2. CONNECTOR 1The sketch of the connector indicates the one-pole types.3. WIRING CONNECTIONSome wi ...

Dtc p0010 "a" camshaft position actuator control circuit/open bank 1
ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0010 "A" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT/OPEN BANK 1DTC detecting condition:Immediately at fault recognitionTrouble symptom:Improper idlingCAUTION:After servicing or replacing faulty part ...

Inspection
LUBRICATION(H4DO) > Engine Oil FilterINSPECTION1. After installing the oil filter, run the engine and check for oil leakage.NOTE:The filter element and filter case are permanently jointed; therefore, interior cleaning is not necessary.2. Check the engine oil level. Engine Oil > INSPECTION&quo ...