DTC B121A (49): An Open in the Mode Control Motor Circuit
| DTC Description | DTC |
|---|---|
| B121A An open in the mode control motor circuit |
- 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 B121A An open in the mode control motor circuit Is DTC B121A or 49 indicated?
YES
Go to step 2.
NO
Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.
- 2. Determine possible failure area (MODE-P line, others):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.
Mode control motor 7P connector 3. Turn the vehicle to the ON mode.
4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Mode control motor 7P connector: disconnected Test point 1 Mode control motor 7P connector No. 2 Test point 2 Body ground Is there about 5 V?
YES
The MODE-P wire is OK. Go to step 3.
NO
Go to step 4.
- 3. Open wire check (SENSOR COM/SENS-COM line):
1. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Mode control motor 7P connector: disconnected Test point 1 Mode control motor 7P connector No. 2 Test point 2 Mode control motor 7P connector No. 3 Is there about 5 V?
YES
The SENSOR COM/SENS-COM wire is OK. Replace the mode control motor .
NO
Repair an open in the wire between the climate control unit and the mode control motor.
- 4. Open wire check (MODE-P line):
1. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Mode control motor 7P connector: disconnected Test point 1 Climate control unit 32P connector No. 22 Test point 2 Body ground Is there about 5 V?
YES
Repair an open in the wire between the climate control unit and the mode control motor.
NO
