DTC N
DTC B1241 or DTC indicator N: A Problem in the Blower Motor Circuit1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.
Is DTC B1241 or N indicated?
YES - Go to step 5.
NO - Intermittent failure, check for loose wires or poor connections on the blower motor circuit.
5. Turn the ignition switch OFF.
6. Check the No. 21 (40 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 7.
NO - Replace the fuse(s), and recheck.
7. Connect the No. 2 terminal of the blower motor 2P connector to body ground with a jumper wire.
8. Turn the ignition switch ON (II).
Does the blower motor run?
YES - Go to step 9.
NO - Go to step 22.
9. Turn the ignition switch OFF.
10. Disconnect the jumper wire.
11. Disconnect power transistor 4P connector.
12. Check for continuity between the No. 2 terminal of the power transistor 4P connector and body ground.
Is there continuity?
YES - Go to step 13.
NO - Check for an open in the wire between the power transistor and body ground. If the wire is OK, check for poor ground at G503.
13. Connect the No. 2 and No. 4 terminals of the power transistor 4P connector with a jumper wire.
14. Turn the ignition switch ON (II).
Does the blower motor run at high speed?
YES - Go to step 15.
NO - Repair open in the BLU/BLK wire between the power transistor and the blower motor.
15. Turn the ignition switch OFF.
16. Disconnect the jumper wire.
17. Disconnect audio-HVAC display panel connector B (16P).
18. Check for continuity between the No. 1 and No. 2 terminals of audio-HVAC display panel connector B (16P) and body ground individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the audio-HVAC display panel and the power transistor.
NO - Go to step 19.
19. Check for continuity between the following terminals of audio-HVAC display panel connector B (16P) and power transistor 4P connector.
Is there continuity?
YES - Go to step 20.
NO - Repair open in the wire(s) between the audio-HVAC display panel and the power transistor.
20. Reconnect audio-HVAC display panel connector B (16P).
21. Test the power transistor.
Is the power transistor OK?
YES - Check for loose wire or poor connections at audio-HVAC display panel connector B (16P) and at the power transistor 4P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.
NO - Replace the power transistor.
22. Turn the ignition switch OFF.
23. Disconnect the jumper wire.
24. Disconnect blower motor 2P connector.
25. Turn the ignition switch ON (II).
26. Measure the voltage between the No. 1 terminal of blower motor 2P connector and body ground.
Is there battery voltage?
YES - Replace the blower motor.
NO - Go to step 27.
27. Turn the ignition switch OFF.
28. Remove the blower motor relay from the under-hood fuse/relay box, and test it.
Is there relay OK?
YES - Go to step 29.
NO - Replace the blower motor relay.
29. Measure the voltage between the No. 2 terminal of the blower motor relay 4P socket and body ground.
Is there battery voltage?
YES - Go to step 30.
NO - Replace the under-hood fuse/relay box.
30. Turn the ignition switch ON (II).
31. Measure the voltage between the No. 4 terminal of blower motor relay 4P socket and body ground.
Is there battery voltage?
YES - Go to step 32.
NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box and the blower motor relay.
32. Turn the ignition switch OFF.
33. Check for continuity between the No. 3 terminal of blower motor relay 4P socket and body ground.
Is there continuity?
YES - Repair open in the WHT/BLU wire between the blower motor relay and the blower motor.
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 G302.