## DTC Troubleshooting: N

DTC indicator N: | A Problem in the Blower Motor Circuit

1. | Clear the DTC by turning the ignition switch OFF, and then ON (II).

2. | Operate the climate control system in several modes.

3. | Check for DTCs using the self-diagnostic. Is DTC N indicated? YES - Go to 4. NO - Intermittent failure, check for loose wires or poor connections on the blower motor circuit.n

4. | Turn the ignition switch OFF.

5. | Check the No. 5 (40A) fuse in the under-hood fuse/relay box, and the No. 10 (7.5A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to 6. NO - Replace the fuse(s), and recheck.n

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

7. | Turn the ignition switch ON (II). Does the blower motor run? YES - Go to 8. NO - Go to 23.

8. | Turn the ignition switch OFF.

9. | Disconnect the jumper wire.

10. | Disconnect the power transistor 4P connector.

11. | Check for continuity between the No. 2 terminal of the power transistor 4P connector and body ground. Is there continuity? YES - Go to 12. NO - Check for an open in the BLK wire between the power transistor and body ground. If the wire is OK, check for poor ground at G402.n

12. | Connect the No. 2 and No. 4 terminals of the power transistor 4P connector with a jumper wire.

13. | Turn the ignition switch ON (II). Does the blower motor run at high speed? YES - Go to 14. NO - Repair open in the BLU/BLK wire between the power transistor and the blower motor.n

14. | Turn the ignition switch OFF.

15. | Disconnect the jumper wire.

16. | Disconnect climate control unit connector.

17. | Check for continuity between the No. 13 and No. 14 terminals of climate control unit 28P connector and body ground individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the power transistor.n NO - Go to 18.

18. | Check for continuity between the following terminals of climate control unit 28P connector and power transistor 4P connector.
28P: | 4P:
No. 13 | No. 1
No. 14 | No. 3
Is there continuity? YES - Go to 19. NO - Repair any open in the wire(s) between the climate control unit and the power transistor.n

19. | Start the engine.

20. | Check for voltage between the No. 13 and No. 14 terminals of climate control unit 28P connector and body ground individually. Is there 1 V or more? YES - Repair short to power in the wires.n NO - Go to 21.

21. | Reconnect climate control unit 28P connector.

22. | Test the power transistor. Is the power transistor OK? YES - Check for loose wire or poor connections at climate control unit 28P connector and at the power transistor 4P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.n NO - Replace the power transistor.n

23. | Disconnect the jumper wire.

24. | Disconnect the blower motor 2P connector.

25. | 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 26.

26. | Turn the ignition switch OFF.

27. | Remove the blower motor relay from the under-dash fuse/relay box, and test it. Is the relay OK? YES - Go to 28. NO - Replace the blower motor relay.n

28. | 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 29. NO - Repair open in the wire between the No. 5 fuse in the under-hood fuse/relay box and the blower motor relay.n

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

30. | 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 31. NO - Replace the under-dash fuse/relay box.n

31. | Turn the ignition switch OFF.

32. | 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