DTC B121A (49)
DTC B121A or DTC indicator 49 : An open in the mode control motor circuit
| DTC Description | DTC |
|---|---|
| B121A An open in the mode control motor circuit |
DTCs (AC)
- 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 .
-4. Check for DTCs.
DTC Description DTC B121A An open in the mode control motor circuit Is DTC B121A or 49 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.
- Determine possible failure area (MDD-P-DR line, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
Mode control motor 5P 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 5P connector: disconnected Test point 1 Mode control motor 5P connector (female terminals) No. 4: Test point 2 Body ground Is there about 5 V?
YES
The MDD-P-DR wire is OK. Go to step 3.
NO
Go to step 4.
- Open wire check (SENS-COM line)
-1. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Mode control motor 5P connector: disconnected Test point 1 Mode control motor 5P connector (female terminals) No. 4: Test point 2 Mode control motor 5P connector (female terminals) No. 5: Is there about 5 V?
YES
Replace the mode control motor .
NO
Repair an open in the SENS-COM wire.
- Open wire check (MDD-P-DR line)
-1. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Mode control motor 5P connector: disconnected Test point 1 Climate control unit connector B (24P) No. 5 Test point 2 Body ground Is there about 5 V?
YES
Repair an open in the MDD-P-DR wire.
NO