( TF09E8HK711000Y1241FAAT00 )
DTC Troubleshooting: B1241 (F and A/C)
DTC B1241 or DTC indicator F and A/C:
A Problem in the Blower Motor Circuit
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch to LOCK (0), and then to ON (II).
  1. Check for DTCs.
Is DTC B1241 or F and A/C indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, check for loose wires or poor connections on the blower motor circuit.■
  1. Turn the ignition switch to LOCK (0).
  1. Check the No. 10 (7.5 A) and No. 57 (30 A) fuses in the under-dash fuse/relay box.
Are the fuses OK?
YES -
Go to Step 7 .
NO -
Replace the fuses, and recheck. If fuses blow again, check for a short in the No. 10 (7.5 A) and No. 57 (30 A) fuses circuit.■
  1. Connect the blower motor 2P connector No. 2 terminal to body ground with a jumper wire.
  1. Turn the ignition switch to ON (II).
Does the blower motor run?
YES -
Go to Step 9 .
NO -
Go to Step 24 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the jumper wire.
  1. Disconnect the power transistor 4P connector.
  1. Check for continuity between the power transistor 4P connector No. 2 terminal 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 body ground at G502. ■
  1. Connect the power transistor 4P connector No. 2 and No. 4 terminals with a jumper wire.
  1. Turn the ignition switch to ON (II).
Does the blower motor run at high speed?
YES -
Go to Step 15 .
NO -
Repair open in the BLU wire between the power transistor and the blower motor.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the jumper wire.
  1. Disconnect the climate control unit 36P connector.
  1. Check for continuity between body ground and the climate control unit 36P connector No. 15 and No. 34 terminals individually.
Is there continuity?
YES -
Repair short to body ground in the wires between the climate control unit and the power transistor.■
NO -
Go to Step 19 .
  1. Check for continuity between the following terminals of the climate control unit 36P connector and the power transistor 4P connector.
    36P:
    4P:
    No. 15
    No. 3
    No. 34
    No. 1

Is there continuity?
YES -
Go to Step 20 .
NO -
Repair open in the wires between the climate control unit and the power transistor.■
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between body ground and the climate control unit 36P connector No. 15 and No. 34 terminals individually.
Is there voltage?
YES -
Repair short to power in the wires.■
NO -
Go to Step 22 .
  1. Reconnect the climate control unit 36P connector.
Is the power transistor OK?
YES -
Check for loose wires or poor connections at the climate control unit 36P 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 .■
NO -
  1. Disconnect the blower motor 2P connector.
  1. Measure the voltage between the blower motor 2P connector No. 1 terminal and body ground.
Is there battery voltage?
YES -
NO -
Go to Step 26 .
  1. Turn the ignition switch to LOCK (0).
Is the relay OK?
YES -
Go to Step 28 .
NO -
Replace the blower motor relay .■
  1. Measure the voltage between the blower motor relay 4P socket No. 1 terminal and body ground.
Is there battery voltage?
YES -
Go to Step 29 .
NO -
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between the blower motor relay 4P socket No. 3 terminal and body ground.
Is there battery voltage?
YES -
Go to Step 31 .
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Check for continuity between the blower motor relay 4P socket No. 4 terminal and body ground.
Is there continuity?
YES -
Repair open in the WHT wire between the blower motor relay and the blower motor.■
NO -
Check for open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor body ground at G501. ■