DTC B1240 (4B): A Problem in the Mode Control Motor Circuit, Linkage, Door, or Motor
| DTC Description | DTC |
|---|---|
| B1240 A problem in the mode control motor circuit, linkage, door, or motor |
- 1. Problem verification:
1. Clear the DTCs with the HDS.
2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
3. Do the Self-Diagnostic Function with the HDS or the climate control unit - Refer to: How to Troubleshoot the Body ElectricalHow to Troubleshoot the Climate Control System .
4. Check for DTCs.
DTC Description DTC B1240 A problem in the mode control motor circuit, linkage, door, or motor Is DTC B1240 or 4B indicated?
YES
Go to step 2.
NO
Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.
- 2. Open wire check (M-DEF line):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connectors.
Climate control unit 32P connector Mode control motor 7P connector 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Climate control unit 32P connector: disconnected Mode control motor 7P connector: disconnected Test point 1 Climate control unit 32P connector No. 10 Test point 2 Mode control motor 7P connector No. 6 Is there continuity?
YES
The M-DEF wire is not open. Go to step 3.
NO
Repair an open in the wire between the climate control unit and the mode control motor.
- 3. Open wire check (M-VENT line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Climate control unit 32P connector: disconnected Mode control motor 7P connector: disconnected Test point 1 Climate control unit 32P connector No. 11 Test point 2 Mode control motor 7P connector No. 7 Is there continuity?
YES
The M-VENT wire is not open. Go to step 4.
NO
Repair an open in the wire between the climate control unit and the mode control motor.
- 4. Shorted wire check (M-DEF line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Climate control unit 32P connector: disconnected Mode control motor 7P connector: disconnected Test point 1 Climate control unit 32P connector No. 10 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire between the climate control unit and the mode control motor.
NO
The M-DEF wire is OK. Go to step 5.
- 5. Shorted wire check (M-VENT line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Climate control unit 32P connector: disconnected Mode control motor 7P connector: disconnected Test point 1 Climate control unit 32P connector No. 11 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire between the climate control unit and the mode control motor.
NO
The M-VENT wire is OK. Go to step 6.
- 6. Mode control motor check:
1. Test the mode control motor .
Is the mode control motor OK?
YES
Replace the climate control unit .
NO
Replace the mode control motor , or repair the mode control linkage or doors.
