Inspection Procedure 2

INSPECTION PROCEDURE 2: When the Air Outlet Change over Control Knob is Moved to Defroster or Defroster/Foot Position, the A/C or the Inside/outside Air Change over Damper Motor does not operate.

CIRCUIT OPERATION
If the inside/outside air change over damper motor does not operate normally, the inside/outside air change over damper motor system may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the A/C-ECU
- Malfunction of the inside/outside air change over damper motor
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Test Harness Set

STEP 1. Check operations of the outside/inside air selection damper control motor.

1. Turn the ignition switch to the "ON" position.
2. Check if inside/outside air change over by the outside/inside air selection damper motor switch is possible.

Q: Does outside/inside air selection damper control motor work normally?

YES: Replace the A/C-ECU.

NO: Refer to Inspection procedure 3 "Inside/Outside Air change over is not possible."