Manufacturer Code Charts: 49

Control System DTCs

DTC Troubleshooting: B121A - (49)

DTC B121A or DTC indicator 49 : An Open in the Mode Control Motor Circuit

1. Problem verification:

-1. Clear the DTCs with the HDS.

-2. Turn the ignition switch to LOCK (0), and then back to ON (II).

-3. Do the Self-Diagnostic Function with the HDS or the climate control unit How to Troubleshoot the Climate Control System.

-4. Check for DTCs.






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. DTC check:

-1. Check for DTCs.






Is DTC B121D or 89 and/or B1227 or 05 and/or B1229 or 07 and/or B1231 or 09 and/or B1233 or 40 and/or B1236 or 43 and/or B2986 or 55 indicated?
-YES- Repair an open in the wire between the climate control unit and the mode control motor.
-NO- Go to step 3.

3. Open wire check (MODE-P line):

-1. Turn the ignition switch to LOCK (0).

-2. Connect terminals A and B with a jumper wire.










-3. Turn the ignition switch to ON (II).

-4. Do the Self-Diagnostic Function with the HDS or the climate control unit How to Troubleshoot the Climate Control System.

-5. Check for DTCs.






Is DTC B121A or 49 indicated?
-YES- Repair an open in the wire between the climate control unit and the mode control motor.
-NO- The MODE-P wire is OK. Replace the mode control motor Mode Control Motor Removal And Installation.