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INSPECTION PROCEDURE 5: A/C Outlet Air Temperature does not Increase
 
 
 
 
 
 
CIRCUIT OPERATION
If the air outlet temperature cannot be adjusted, the air mixing damper control motor circuit may be failed.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the air mixing damper control motor
  • Malfunction of the A/C control panel
  • Damaged wiring harness or connectors
 
 
 
DIAGNOSIS
Required Special Tool:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Using scan tool MB991958, check for diagnostic trouble code.
Check if an A/C control panel DTC is set.
(1) Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Refer to DIAGNOSTIC TROUBLE CODE CHART .
Go to Step 2.
 
STEP 2. Check air mixing damper control motor connector C-214 and A/C control panel connector C-232 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are air mixing damper control motor connector C-214 and A/C control panel connector C-232 in good condition?
Go to Step 3.
Repair or replace the connector. Refer to GROUP 00E, Harness Connector Inspection . Check that the A/C works normally.
 
STEP 3. Check the wiring harness between A/C control panel connector C-232 (terminals 28, 32, 30, 31 and 29) and air mixing damper control motor connector C-214 (terminals 3, 6, 2, 5 and 1).
  • Check the A/C control panel signal line for open and short circuit.
Are the wiring harness between A/C control panel connector C-232 (terminals 28, 32, 30, 31 and 29) and air mixing damper control motor connector C-214 (terminals 3, 6, 2, 5 and 1) in good condition?
Go to Step 4.
Repair the wiring harness. Check that the A/C works normally.
 
STEP 4. Replace the air mixing damper control motor and check the trouble symptom again
Check the trouble symptom again.
Is the check result satisfactory?
The procedure is complete.
Replace the A/C control panel.