DTC Troubleshooting: B121A (B-B1), B121A (49)
DTC B121A or DTC screen B-B1 or DTC indicator 49: An open in the mode control motor circuit
DTC Description |
DTC |
B121A An open in the mode control motor circuit |
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1. |
Problem verification:
Problem verification
?1. |
Clear the DTCs with the HDS.
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?2. |
Turn the vehicle to the OFF (LOCK) mode and then the ON mode. |
?4. |
Check for DTCs.
DTC Description |
DTC |
B121A An open in the mode control motor circuit |
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Is DTC B121A, Error on the DTC screen B-B1 (climate control panel without display) or 49 (climate control panel with display) indicated?
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Intermittent failure. Check for loose wires or poor connections on the mode control motor circuit.? |
2. |
Determine possible failure area (MDD-P line, others):
Determine possible failure area (MDD-P line, others)
?1. |
Turn the vehicle to the OFF (LOCK) mode. |
?2. |
Disconnect the following connector.
Mode control motor 5P connector | |
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?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. 2:  |
Test point 2 |
Body ground | |
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Is there about 5 V?
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The MDD-P wire is OK. Go to step 3. |
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3. |
Open wire check (SENS-COM line):
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. 2:  |
Test point 2 |
Mode control motor 5P connector (female terminals) No. 1:  | |
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Is there about 5 V?
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Repair an open in the SENS-COM wire.? |
4. |
Open wire check (MDD-P line):
Open wire check (MDD-P 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 |
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Test point 2 |
Body ground | |
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Is there about 5 V?
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Repair an open in the MDD-P wire.? |
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