DTC B1608 SUNLOAD Sensor Open: Wiring Diagram

Air Conditioning System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Sunload Sensor - Wiring Diagram

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Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK CONNECTOR. Read the DTC of the A/C CM using the Subaru Select Monitor.	Is B1608 displayed?	Go to step 2 .	Check the connection of the sunload sensor circuit.
2 CHECK HARNESS. Disconnect the sunload sensor. Using a tester, check continuity between terminals. Connector & terminal (i194) No. 6 - Chassis ground:	Is there continuity?	Go to step 3 .	Repair or replace the open circuit of harness.
3 CHECK HARNESS. Turn the ignition switch to ON. Using the tester, measure the voltage between terminals. Connector & terminal (i194) No. 3 (+) - No. 6 (-):	Is the voltage 10.0 - 14.0 V?	Go to step 4 .	Repair or replace the open circuit of harness.
4 CHECK SUNLOAD SENSOR. Connect the sunload sensor. Turn the ignition switch to ON. Using the tester, measure the voltage between terminals. CAUTION: Because the sensor may not respond to weak light, use incandescent light for the inspection and bring it to 30 cm or less from the sensor. Connector & terminal (i194) No. 1 (+) - No. 6 (-):	0.8 V or less with no direct sunlight (covering the sensor with cloth), & 0.8 - 4.3 V±0.3 V (according to the intensity of the light) with the inspection light brought closer	Go to step 5 .	Replace the sunload sensor. Refer to REMOVAL .
5 CHECK HARNESS. Disconnect the sunload sensor. Disconnect the connector from A/C CM. Using a tester, check continuity between terminals. Connector & terminal (i194) No. 1 - (i80) No. 24:	Is there continuity?	Go to step 6 .	Repair or replace the open circuit of harness.
6 CHECK HARNESS. Using a tester, check continuity between terminals. Connector & terminal (i194) No. 3 - (B280) No. 9:	Is there continuity?	Repair or replace the open circuit of harness.	Replace the A/C CM. Refer to REMOVAL .