DTC B1601 In-Vehicle Sensor Short: Wiring Diagram

Air Conditioning System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: In-Vehicle Sensor - Wiring Diagram

G08348792

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK CONNECTOR. Check the condition of connector connection. Read the DTC using Subaru Select Monitor.	Is B1601 displayed?	Go to step 2 .	Check the connection of the in-vehicle sensor circuit.
2 CHECK IN-VEHICLE SENSOR. Disconnect the in-vehicle sensor. Refer to REMOVAL . Read the DTC of the A/C ECM using the Subaru Select Monitor.	Is B1602 displayed?	Replace the in-vehicle sensor. Refer to REMOVAL .	Go to step 3 .
3 CHECK HARNESS. Turn the ignition switch to ON. Using the tester, measure the voltage between terminals. Connector & terminal (i173) No. 2 (+) - No. 1 (-):	Is the voltage 4.5 - 5.0 V?	Check the connection of the in-vehicle sensor circuit.	Go to step 4 .
4 CHECK HARNESS. Disconnect the connector from A/C CM. Using a tester, check continuity between terminals. Connector & terminal (i173) No. 1 - No. 2:	Is there continuity?	Repair or replace the short circuit of the harness.	Replace the A/C CM. Refer to REMOVAL .