| DTC indicator N or DTC B1241: | A Problem in the Blower Motor Circuit |
| 1. | Clear the DTC. |
| 2. | Turn the ignition switch OFF, and then ON. |
| 3. | Operate the climate control system is several modes. |
| 4. | Check the DTCs. Is DTC N or B1241 indicated? YES - Go to 5. NO - Intermittent failure, check for loose wires or poor connections on the blower motor circuit.n |
| 5. | Check the No. 21 (40A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5A) fuse in the driver's 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 22. |
| 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 wire between the power transistor and body ground. If the wire is OK, check for poor ground at G503.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 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 B (16P). |
| 17. | Check for continuity between the No. 1 and No. 2 terminals of climate control unit connector B (16P) 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 connector B (16P) and power transistor 4P connector.
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. | Reconnect climate control unit connector B (16P). |
| 20. | Test the power transistor. Is the power transistor OK? YES - Go to 21. NO - Replace the power transistor.n |
| 21. | Perform the A/C communication in the Self-Diagnostic Function to obtain the IS-BUS communication varification status Is the communication OK? YES - Check for loose wire or poor connections at climate control unit connector B (16P) and at the Power transistor 4P connector. If the connections are good, substitute a known-good climate control unit and printed circuit board, and recheck. If the symptom/indication goes away, replace the original climate control unit and printed circuit board.n NO - Check for loose wire or poor connections at climate control unit connector B (16P) and at the power traisistor 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 |
| 22. | Disconnect the jumper wire. |
| 23. | Disconnect the blower motor 2P connector. |
| 24. | 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 25. |
| 25. | Turn the ignition switch OFF. |
| 26. | Remove the blower motor relay from the under-hood fuse/relay box, and test it. Is there relay OK? YES - Go to 27. NO - Replace the blower motor relay.n |
| 27. | 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 28. NO - Replace the under-hood fuse/relay box.n |
| 28. | Turn the ignition switch ON (II). |
| 29. | Measure the voltage between the No. 4 terminal of the blower motor relay 4P socket and body ground. Is there battery voltage? YES - Go to 30. NO - Repair open in the wire between the No. 30 fuse in the driver's under-dash fuse/relay box and the blower motor relay.n |
| 30. | Turn the ignition switch OFF. |
| 31. | Check for continuity between the No. 3 terminal of the blower motor relay 4P socket and body ground. Is there contnuity? YES - Repair open in the WHT/BLU 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 G302.n |