Inspection Procedure 3

Inside / Outside Air Changeover is not possible.

Inside/Outside Air Chengeover Damper Motor Circuit:

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

Required Special Tools:
- MB991223: Test Harness Set

STEP 1. Check the defogger and A/C operations.

Q: Do the defogger and A/C work normally?

YES: Go to Step 2.

NO: Refer to Inspection procedure 10 "Malfunction of the A/C-ECU Power Supply system."

STEP 2. 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.










Check the outside/inside air selection damper control motor by the procedures in the table.

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

YES: Go to Step 3.

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

STEP 3. Measure the voltage at outside/inside air selection damper control motor connector C-108.







1. Disconnect outside/inside air selection damper control motor connector C-108, 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 6.

NO: Go to Step 4.

STEP 4. Check outside/inside air selection damper control motor connector C-108 for damage.







Q: Is outside/inside air selection damper control motor connector C-108 in good condition?

YES: Go to Step 5.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the outside/inside air selection damper control motor works normally.

STEP 5. Check the wiring harness between outside/inside air selection damper control motor connector C-108 (terminal 7) and the ignition switch (IG2).







NOTE: Also check intermediate connector C-10, junction block connectors C-205 and C-203. If intermediate connector C-10, junction block connectors C-205 or C-203 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-108 (terminal 7) and the ignition switch (IG2) in good condition?

YES: Check that the outside/inside air selection damper control motor works normally.

NO: Repair the wiring harness. Check that the outside/ inside air selection damper control motor works normally.

STEP 6. Check outside/inside air selection damper control motor connector C-108 and A/C-ECU C-06 for damage.







Q: Is outside/inside air selection damper control motor connector C-108 and A/C-ECU C-06 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the outside/inside air selection damper control motor works normally.

STEP 7. Check the wiring harness between outside/inside air selection damper control motor connector C-108 (terminals 6 and 4) and A/C-ECU C-06 (terminals 2 and 3).







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-108 (terminal 6 and 4) and A/C-ECU C-06 (terminal 2 and 3) in good condition?

YES: Replace the A/C-ECU, and check that the outside/ inside air selection damper control motor works normally.

NO: Repair the wiring harness. Check that the outside/ inside air selection damper control motor works normally.