DTC Troubleshooting: B1239 (L)

DTC indicator L or DTC B1239:
 An Open or Short in the Mode Control Motor Circuit
  1. Clear the DTC.
  1. Turn the ignition switch OFF, and then ON.
  1. Operate the climate control system is several modes.
  1. Check the DTCs.
Is DTC L or B1239 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, check for loose wires or poor connections on the mode control motor circuit.■
Is the mode control motor OK?
YES -
Go to Step 6 .
NO -
Replace the mode control motor.■
  1. Disconnect the mode control motor 7P connector.
  1. Disconnect climate control unit connector A (22P).
  1. Check for continuity between following terminals of climate control unit connector A (22P) and the mode control motor 7P connector.
    22P:
    7P:
    No. 6
    No. 1
    No. 7
    No. 2
    No. 15
    No. 7
    No. 16
    No. 3
    No. 17
    No. 4
    No. 18
    No. 5
    No. 19
    No. 6

Is there continuity?
YES -
Go to Step 9 .
NO -
Repair any open in the wire(s) between the climate control unit and the mode control motor.■

  1. Check for continuity between body ground and climate control unit connector A (22P) terminals No. 6, 7, 15, 16, 17, 18 and 19 individually.
Is there continuity?
YES -
Repair any short to body ground in the wire(s) between the climate control unit and the mode control motor.■
NO -
Go to Step 10 .

  1. Turn the ignition switch ON (II), and check the same terminals for voltage.
Is there any voltage?
YES -
Repair any short to power in the wire(s) between the climate control unit and the mode control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit.■
NO -
Check for loose wires or poor connections at climate control unit connector A (22P) and at the mode control motor 7P 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 .■