Code No.B1055 Motor drive system for Rear Air Mixing Damper <Vehicles with dual automatic A/C>

COMMENTS ON TROUBLE SYMPTOM

This code is set when the rear air mixing damper cannot be rotated to the preset opening angle.

PROBABLE CAUSES

Malfunction of the rear air mixing 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 13: R.Air mix dumper motor: 0%
Item 14: R.Air mix dumper motor: 50%
Item 15: R.Air mix dumper motor: 100%

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 G-13-1 rear air mixing 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 35 and 36) and G-13-1 rear air mixing damper control motor and potentiometer connector (terminals 2 and 1).

note

Prior to the wiring harness inspection, check intermediate connector C-15 and G-13, and repair if necessary.

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 air mixing damper control motor and potentiometer.

Refer to

.

Q. Is the check result normal?

	Go to Step 5.

	Replace the air mixing 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 )