Code No.B1041,B1042: Potentiometer system for the air mixing damper

DIAGNOSIS CODE SET CONDITION
This code is set when the air mixing damper control motor potentiometer does not send any signal to the A/C-ECU due to short or open circuit.

POSSIBLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-44 A/C-ECU connector and C-49 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 C-44 A/C-ECU connector (terminals 34, 32 and 38) and C-49 air mixing damper control motor and potentiometer connector (terminals 6, 2 and 5).


note Prior to the wiring harness inspection, check joint connector C-138 and C-137, and repair if necessary.

  • Check the potentiometer power supply, earth and signal line for open and short circuit.

Q. Is the check result normal?

Go to Step 3.

Repair the 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.

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 ).