Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1433 ambient temperature sensor circuit short-circuit (air-conditioner)

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1433 ambient temperature sensor circuit short-circuit (air-conditioner)

DTC DETECTING CONDITION:

• Ambient sensor to combination meter circuit is shorted.

• Data to be received from the combination meter via CAN communication do not arrive.

TROUBLE SYMPTOM:

• Defective ambient temperature display

• Ambient temperature is falsely recognized as 15.2°C, and the compartment temperature is adjusted.

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Air conditioning system Air Conditioning System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK CONNECTOR. 1) Check the connecting conditions of combination meter connector and ambient sensor connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1433 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER)	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 AMBIENT SENSOR. 1) Disconnect the ambient sensor. Ambient Sensor > REMOVAL 2) Read the DTC of the A/C CM using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1432 displayed-	Replace the ambient sensor. Ambient Sensor > REMOVAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER)
3.CHECK HARNESS. 1) Turn the ignition switch to ON. 2) Using the tester, measure the voltage between terminals. Connector & terminal (B480) No. 1 (+) — No. 2 (−):	Is the voltage 4.5 — 5.0 V-	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.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER)
4.CHECK HARNESS (SHORTED BETWEEN LINES). 1) Disconnect the connector from the combination meter. 2) Using a tester, check continuity between terminals. Connector & terminal (B480) No. 1 — No. 2:	Is there continuity-	Repair or replace the short circuit of the harness.	Replace the combination meter. Combination Meter > REMOVAL

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