Code No. B1045: Air mixing damper control motor drive system








DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Malfunction of air mix damper potentiometer motor and potentiometer
  • Damaged harness wires and connectors
  • Malfunction of the A/C-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

  • Item 06: Air mix damper

Q. Does the air mix damper motor work normally?
Go to Step 5.
Go to Step 2.

STEP 2. Connector check: B-17 air mixing damper control motor and potentiometer connector, and B-16 A/C-ECU connector

Q. Is the check result normal?
Go to Step 3.
Repair the damaged connector.

STEP 3. Check the wiring harness between B-17 air mixing damper control motor and potentiometer connector terminal No. 1, 2 and B-16 A/C-ECU connector terminal No. 12, 1.

  • Check the output lines for open or short circuit.

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

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

Q. Is the check result normal?
Go to Step 5.
Replace the air mix damper motor and potentiometer.

STEP 5. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?
Replace the A/C-ECU.
Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)