DTC Troubleshooting: B1241 (N)

DTC indicator N or DTC B1241: A Problem in the Blower Motor Circuit Clear the DTC. Turn the ignition switch OFF, and then ON. Operate the climate control system is several modes. Check the DTCs. Is DTC N or B1241 indicated?
YES | - | Go to Step 5 .
NO | - | Intermittent failure, check for loose wires or poor connections on the blower motor circuit.■
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 6 .
NO | - | Replace the fuse(s), and recheck.■
Connect the No. 2 terminal of the blower motor 2P connector to body ground with a jumper wire. Turn the ignition switch ON (II). Does the blower motor run?
YES | - | Go to Step 8 .
NO | - | Go to Step 21 .
Turn the ignition switch OFF. Disconnect the jumper wire. Disconnect the power transistor 4P connector. |

Check for continuity between the No. 2 terminal of the power transistor 4P connector and body ground. Is there continuity?
YES | - | Go to Step 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.■

Connect the No. 2 and No. 4 terminals of the power transistor 4P connector with a jumper wire. Turn the ignition switch ON (II). Does the blower motor run at high speed?
YES | - | Go to Step 14 .
NO | - | Repair open in the wire between the power transistor and the blower motor.■
Turn the ignition switch OFF. Disconnect the jumper wire. Disconnect climate control unit connector B (16P). |

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.■
NO | - | Go to Step 18 .

1. Check for continuity between the following terminals of climate control unit connector B (16P) and power transistor 4P connector.
   16P: | 4P:
   No. 1 | No. 1
   No. 2 | No. 3
Is there continuity?
YES | - | Go to Step 19 .
NO | - | Repair any open in the wire(s) between the climate control unit and the power transistor.■
Reconnect climate control unit connector B (16P). Test the power transistor. Is the power transistor OK?
YES | - | Check for loose wires 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 recheck. If the symptom/indication goes away, replace the original climate control unit .■
NO | - | Replace the power transistor.■
Disconnect the jumper wire. Disconnect the blower motor 2P connector. |

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.■
NO | - | Go to Step 24 .
Turn the ignition switch OFF. Remove the blower motor relay from the under-hood fuse/relay box, and test it. Is the relay OK?
YES | - | Go to Step 26 .
NO | - | Replace the blower motor relay .■

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 27 .
NO | - | Replace the under-hood fuse/relay box.■
Turn the ignition switch ON (II). |

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 Step 29 .
NO | - | Repair open in the wire between the No. 30 fuse in the under-dash fuse/relay box and the blower motor relay.■
Turn the ignition switch OFF. |

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.■
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.■