[Previous][Next]
DTC B1125: Air outlet damper circuit open
DTC B1128: Air outlet damper circuit short
 
 
 
 
DTC SET CONDITION
  • When the air conditioning outlets cannot be switched, open circuit (DTC B1125) and short circuit (DTC B1128) of the mode selection damper control motor circuit are set.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the mode selection damper control motor
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
  • Malfunction of the A/C controller assembly (A/C-ECU)
 
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Using scan tool (M.U.T.-IIISE), check actuator test.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Carry out the actuator test (Refer to ).
Item No.8: Mode selection damper
Is the check result normal?
Go to Step 3.
Go to Step 2.
 
STEP 2. Check of open circuit in IG1, MA, MA’, MB and MB’ line between mode selection damper control motor connector and A/C controller assembly (A/C-ECU) connector.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check whether the DTC is set again.
Is the DTC set?
Replace the mode selection damper control motor. Then go to Step 4.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 4. Check whether the DTC is set again.
Is the DTC set?
Replace the A/C controller assembly (A/C-ECU).
This procedure is complete.