WIRING DIAGRAM
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK BLOWER MOTOR CIRCUIT . Turn the ignition switch to OFF. Disconnect the power transistor connector. Use a tester to measure the resistance between the connector and chassis ground. Connector & terminal (B57) No. 3 - Chassis ground | Is the resistance less than 1 ohms? | Repair or replace the harness. | Go to step 2 . |
| 2 CHECK POWER TRANSISTOR . Measure the resistance between power transistor terminals with a tester. Connector & terminal (B57) No. 3 - No. 1 | Is the resistance less than 1 ohms? | Replace the power transistor. Refer to REMOVAL , Power Transistor (Auto A/C Model) . | Go to step 3 . |
| 3 CHECK HARNESS . Remove the auto A/C control module. Use a tester to measure the resistance between the power transistor connector and chassis ground. Connector & terminal (B57) No. 2 - Chassis ground | Is the resistance less than 1 ohms? | Repair or replace the short circuit of the harness. | Replace the auto A/C control module. |
DIAGNOSIS PROCEDURE CHART