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DTC B1126: In/out select dmpr. circuit open
DTC B1129: In/out select dmpr. circuit short
 
 
 
 
DTC SET CONDITION
When the inside/outside air cannot be switched, open circuit (DTC B1126) and short circuit (DTC B1129) of the inside air/outside air changeover motor circuit are set.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the outside/inside air 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.10: Out/Inside air select damper
Is the check result normal?
Go to Step 3.
Go to Step 2.
 
STEP 2. Check of open circuit in IG1, FA, FA’, FB and FB’ line between outside/inside air 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 outside/inside air 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.