B1088, B1089 – Motor sensor system for air mix damper MMC Colt



COMMENTS ON TROUBLE SYMPTOM


PROBABLE CAUSE

  • Malfunction of the front air mixing damper control motor and potentiometer
  • Damaged wiring harness or connectors
  • Malfunction of the semi automatic air conditioner control panel (A/C-ECU)

  • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III data list

  • Item 22: Air mixing damper potentiometer
  • Item 32: Air mixing potentiometer (Target)
  • Q. Is the check result normal?

    STEP 2. Connector check: B-113 A/C-ECU connector and B-12 air mixing damper control motor and potentiometer connector

    Q. Is the check result normal?

    STEP 3. Check the wiring harness between B-113 A/C-ECU connector (terminals 13, 15 and 12) and B-12 air mixing damper control motor and potentiometer connector (terminals 4, 3 and 5) <LHD> or (terminals 5,3 and 4) <RHD>.

  • Check the potentiometer power supply, earth and signal line for open and short circuit.
  • Q. Is the check result normal?

    STEP 4. Check the air mixing damper control motor and potentiometer.

    Q. Is the check result normal?

    STEP 5. Check whether the diagnosis code is reset.

    Q. Is the diagnosis code set?

    Author: admin