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Subaru Crosstrek Service Manual: Dtc b14e4 air mix door actuator stepping motor circuit short-circuit (passenger)

Subaru Crosstrek Service Manual / Hvac system (auto a/c) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b14e4 air mix door actuator stepping motor circuit short-circuit (passenger)

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC B14E4 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (PASSENGER)

DTC detecting condition:

Air mix door actuator stepping motor circuit is shorted.

Trouble symptom:

Temperature cannot be adjusted.

Wiring diagram:

Air conditioning system Air Conditioning System > WIRING DIAGRAM">

STEPCHECKYESNO

1.CHECK CONNECTOR.

1) Check the condition of connector connection.

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

Is B14E4 displayed?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14E4 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (PASSENGER)">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 POWER SUPPLY OF AIR MIX DOOR ACTUATOR.

1) Turn the ignition switch to OFF.

2) Disconnect the air mix door actuator connector.

3) Turn the ignition switch to ON.

4) Measure the voltage between the air mix door actuator connector terminal and chassis ground.

Connector & terminal

(B239) No. 3 (+) — Chassis ground (–):

Is the voltage approx. 10 V or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14E4 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (PASSENGER)">Go to Step 3.

Check the DC power supply circuit.

3.CHECK AIR MIX DOOR ACTUATOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance between air mix door actuator terminals using a tester.

Connector & terminal

(B239) No. 3 — No. 1:
(B239) No. 3 — No. 2:
(B239) No. 3 — No. 5:
(B239) No. 3 — No. 6:

Is the resistance 80 — 100 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14E4 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (PASSENGER)">Go to Step 4.

Replace the actuator. Air Mix Door Actuator > REMOVAL">

4.CHECK HARNESS BETWEEN A/C CONTROL PANEL AND AIR MIX DOOR ACTUATOR (SHORTED TO POWER SUPPLY).

1) Disconnect the A/C control panel connector.

2) Measure the voltage between air mix door actuator connector and chassis ground.

Connector & terminal

(B239) No. 1 (+) — Chassis ground (−):
(B239) No. 2 (+) — Chassis ground (−):
(B239) No. 5 (+) — Chassis ground (−):
(B239) No. 6 (+) — Chassis ground (−):

Is there any voltage?

Repair or replace the short circuit of the harness.

Replace the A/C control panel. Control Panel > REMOVAL">

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