Code No.B1045: Air mix damper motor


DIAGNOSIS CODE SET CONDITION
This code is set when the air mixing damper control motor cannot be rotated to the preset opening angle.

POSSIBLE CAUSES

  • Malfunction of the air mixing damper control motor and potentiometer.
  • Malfunction of the auto A/C controller assembly (A/C-ECU).
  • Damaged the wiring harness or connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test
Check that the following actuator test can be executed normally.
Item No.6: Air mix damper motor

Q. Is the check result normal?
Go to Step 4.
Go to Step 2.

STEP 2. Check open and short circuit in COOL and HOT line between air mixing damper control motor and potentiometer connector (damper control motor side) and auto A/C controller assembly (A/C-ECU) connector.

Q. Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.

STEP 3. Check the 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. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.

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