Code No. B1065: Motor drive system for air outlet switching damper

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

PROBABLE CAUSES

  • Malfunction of the rear mode selection damper control motor and potentiometer
  • Malfunction of the automatic air conditioner control panel (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.(Refer to .)

  • Item 20: Air outlet c/o dumper: FACE
  • Item 21: Air outlet c/o dumper: Bi-Level
  • Item 22: Air outlet c/o dumper: FOOT
  • Item 23: Air outlet c/o dumper: DEF/FOOT
  • Item 24: Air outlet c/o dumper: DEF

Q. Is the check result normal?
Go to Step 5.
Go to Step 2.

STEP 2. Connector check: C-105 A/C-ECU connector and C-04 rear mode selection damper control motor and potentiometer connector



Q. Is the check result normal?

Go to Step 3.

Repair the connector.

STEP 3. Check the wiring harness between C-105 A/C-ECU connector (terminals 33 and 34) and C-04 rear mode selection damper control motor and potentiometer connector (terminals 1 and 2).




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

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 4. Check the rear mode selection damper control motor and potentiometer.
Refer to .

Q. Is the check result normal?
Go to Step 5.
Replace the mode selection damper control motor and potentiometer.

STEP 5. M.U.T.-III diagnosis code

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