Inspection Procedure 3

Outside/Inside Air Selection is not possible.

Outside/Inside Air Selection Damper Control Motor Circuit Part 1:

Outside/Inside Air Selection Damper Control Motor Circuit Part 2:

CIRCUIT OPERATION
The outside/inside air selection damper motor is energized through the ignition switch (IG2). The motor is controlled by the heater control.

TECHNICAL DESCRIPTION
If the outside/inside air selection damper motor does not operate normally, the outside/inside air selection damper motor system may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the outside/inside air selection damper motor
- Malfunction of the heater control
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set

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

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

YES: Go to Step 2.

NO: Refer to Inspection procedure 9 "Malfunction of the heater control 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 or outside air position.

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

Q: Does the 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-07.




1. Disconnect outside/inside air selection damper control motor connector C-07, and measure the voltage at the harness side.
2. Turn the ignition switch to the "ON" position.




3. Measure the voltage between terminal 7 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts?

YES: Go to Step 6.

NO: Go to Step 4.




STEP 4. Check outside/inside air selection damper control motor connector C-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is outside/inside air selection damper control motor connector C-07 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-07 (terminal 7) and the ignition switch (IG2).









NOTE: Also check intermediate connector C-10, joint connector 2. C-101, junction block connectors C-210 and C-211 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-10, joint connector 2. C-101, 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 (terminal 7) and the ignition switch (IG2) in good condition?

YES: It can be assumed that this malfunction is intermittent. Refer to How to Cope with intermittent Malfunctions.

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-07 and heater control connector C-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is outside/inside air selection damper control motor connector C-07 and heater control connector C-16 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-07 (terminals 6 and 4) and heater control connector C-16 (terminals 3 and 2).

NOTE: Also check intermediate connector C-10 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. 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 (terminal 6 and 4) and heater control connector C-16 (terminal 3 and 2) in good condition?

YES: Replace the heater control, 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.