## Blower Motor Circuit Troubleshooting

1. | Turn the ignition switch ON (II) and the heater fan switch ON. Does the blower motor run? YES - Go to 2. NO - Go to 16.

2. | Turn the heater fan switch OFF.

3. | Make sure the ignition switch is ON (II). Does the blower motor run? YES - Go to 4. NO - Go to 9.

4. | Turn the ignition switch OFF.

5. | Disconnect the blower motor 2P connector.

6. | Disconnect the blower resistor 4P connector.

7. | Disconnect the heater fan switch 7P connector.

8. | Check for continuity between the No. 1, 2, 4 and 5 terminals of the heater fan switch 7P connector and body ground individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the blower motor, the blower resistor and the heater fan switch.n NO - Replace the heater fan switch.n

9. | Turn the ignition switch OFF.

10. | Disconnect the blower resistor 4P connector.

11. | Measure the resistance between the No. 2 and No. 3 terminals of the blower resistor. Is there about 3-4 W? YES - Go to 12. NO - Replace the blower resistor.n

12. | Reconnect the blower resistor 4P connector.

13. | Disconnect the heater fan switch 7P connector.

14. | Turn the ignition switch ON (II).

15. | Ground each of the heater fan switch 7P connector terminals individually in the following order: No. 1, 2, 4 and 5. Does the blower motor run at progressively higher speeds? YES - Replace the heater fan switch.n NO - Repair any open or cause of excessive resistance in the appropriate wire(s) between the blower resistor and the heater fan switch.n

16. | Turn the heater fan switch OFF and the ignition switch OFF.

17. | Check the No. 5 (40A) fuse in the under-hood fuse/relay box, and the No. 22 (7.5A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to 18. NO - Replace the fuse(s), and recheck.n

18. | Connect the No. 2 terminal of the blower motor 2P connector to body ground with a jumper wire.

19. | Turn the ignition switch ON (II). Does the blower motor run? YES - Go to 20. NO - Go to 27.

20. | Turn the ignition switch OFF.

21. | Disconnect the jumper wire.

22. | Disconnect the heater fan switch 7P connector.

23. | Turn the ignition switch ON (II).

24. | Measure the voltage between the No. 5 terminal of the heater fan switch 7P connector and body ground. Is there battery voltage? YES - Go to 25. NO - Repair open in the wire between the blower motor and the heater fan switch.n

25. | Turn the ignition switch OFF.

26. | Check for continuity between the No. 3 terminal of the heater fan switch 7P connector and body ground. Is there continuity? YES - Replace the heater fan switch.n NO - Check for an open in the wire between the heater fan switch and body ground. If the wire is OK, check for poor ground at G402.n

27. | Disconnect the jumper wire.

28. | Disconnect the blower motor 2P connector.

29. | Measure the voltage between the No. 1 terminal of the blower motor 2P connector and body ground. Is there battery voltage? YES - Replace the blower motor.n NO - Go to 30.

30. | Turn the ignition switch OFF.

31. | Remove the blower motor relay from the under-dash fuse/relay box, and test it. Is the relay OK? YES - Go to 32. NO - Replace the blower motor relay.n

32. | Measure the voltage between the No. 1 terminal of the blower motor relay 5P socket and body ground. Is there battery voltage? YES - Go to 33. NO - Repair open in the wire between the No. 5 fuse in the under-hood fuse/relay box and the blower motor relay.n

33. | Turn the ignition switch ON (II).

34. | Measure the voltage between the No. 5 terminal of the blower motor relay 5P socket and body ground. Is there battery voltage? YES - Go to 35. NO - Replace the under-dash fuse/relay box.n

35. | Turn the ignition switch OFF.

36. | Check for continuity between the No. 3 terminal of the blower motor relay 5P socket and body ground. Is there continuity? YES - Repair open in the BLU/WHT wire between the blower motor relay and the blower motor.n NO - Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G401.n