Code No.B1045: Motor drive system for the front air mix damper








COMMENTS ON TROUBLE SYMPTOM
This code is set when the air mixing damper cannot be rotated to the preset opening angle.

PROBABLE CAUSES

  • Malfunction of the front air mixing damper control motor and potentiometer
  • Malfunction of the A/C-ECU
  • Damaged the wiring harness or connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-08 A/C-ECU connector and D-201 front air mixing damper control motor and potentiometer connector

Q. Is the check result normal?
Go to Step 2.
Repair the connector.

STEP 2. Check the wiring harness between D-08 A/C-ECU connector (terminals 17 and 18) and D-201 front air mixing damper control motor and potentiometer connector (terminals 1 and 2).

  • Check the motor activating lines for open and short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair the wiring harness.

STEP 3. Check the front air mixing damper control motor and potentiometer.
Refer to .

Q. Is the check result normal?
Go to Step 4.
Replace the air mixing damper control motor and potentiometer.

STEP 4. M.U.T.-III diagnosis code

Q. Is the diagnosis code set?
Replace the A/C-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).