02 - Inspection Procedure

When the Air Outlet Changeover Control Knob is Moved to Defroster or Defroster/Foot Position, the A/C or the Inside/outside Air Changeover Damper Motor does not operate

Inside/Outside Air Changeover Damper Motor Circuit:

Connectors:

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

TROUBLESHOOTING HINTS
- Malformation of the A/C-ECU
- Malformation of the inside/outside air changeover damper motor
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set

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









CAUTION: Cut off the battery voltage when the damper is in the inside/outside air position.

Remove the outside/inside air selection damper control motor, and check that it works normally.

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

YES: Go to Step 2.

NO: Replace the outside/inside air selection damper control motor Check that the air conditioning works normally.







STEP 2. Measure the voltage at outside/inside air selection damper control motor connector C-07.

1. Disconnect outside/inside air selection damper control motor connector C-07, and measure the voltage at the harness side.
2. Ignition switch: ON
3. Measure the voltage between terminal 7 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES: Go to Step 5.

NO: Go to Step 3.




STEP 3. Check outside/inside air selection damper control motor connector C-07 for damage.

Q: Is outside/inside air selection damper control motor connector C-07 in good condition?

YES: Go to Step 4.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.










STEP 4. Check the wiring harness between outside/inside air selection damper control motor connector C-07 and the ignition switch (IG2).

NOTE: Also check intermediate connector C-10, joint connector C-101, junction block connectors C-210 and C-211. If intermediate connector C-10, joint connector C-101 or junction block connectors C-210 or C-211 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between outside/inside air selection damper control motor connector C-07 and the ignition switch (IG2) in good condition?

YES: Go to Step 5.

NO: Repair the wiring harness. Check that the air conditioning works normally.







STEP 5. Check outside/inside air selection damper control motor connector C-07 and A/C-ECU C-16 for damage.

Q: Is outside/inside air selection damper control motor connector C-07 in good condition?

YES: Go to Step 6.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.







STEP 6. Check the wiring harness between outside/inside air selection damper control motor connector C-07 and A/C-ECU C-16.

NOTE: Also check intermediate connector C-10. If intermediate connectors C-10 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between outside/inside air selection damper control motor connector C-07 and the A/C-ECU connector C-16 in good condition?

YES: Replace the A/C-ECU, and check that the air conditioning works normally.

NO: Repair the wiring harness. Check that the air conditioning works normally.