DTC Troubleshooting: B2986 (55)
DTC B2986 or DTC indicator 55: An Open in the Recirculation Control Motor Circuit
DTC Description
DTC
B2986 An open in the recirculation control motor circuit
  

1.
Problem verification:

Problem verification
?1.
Clear the DTC 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
B2986 An open in the recirculation control motor circuit
  

Is DTC B2986 or 55 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure. Check for loose wires or poor connections on the recirculation control motor circuit.?
2.
Determine possible failure area (RFD-P/FRD-P line, others):

Determine possible failure area (RFD-P/FRD-P line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Recirculation 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
Recirculation control motor 7P connector: disconnected
Test point 1
Recirculation control motor 7P connector No. 2
Test point 2
Body ground


Is there about 5 V?

     
YES
     
     
     
The RFD-P/FRD-P wire is OK. Go to step 3.
     
NO
     
     
     
Go to step 4.
3.
Open wire check (SENSOR COM/SENS-COM line):

Open wire check (SENSOR COM/SENS-COM line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Recirculation control motor 7P connector: disconnected
Test point 1
Recirculation control motor 7P connector No. 1
Test point 2
Recirculation control motor 7P connector No. 2


Is there about 5 V?

     
YES
     
     
     
The SENSOR COM/SENS-COM wire is OK. Replace the recirculation control motor.?
     
NO
     
     
     
Repair an open in the wire between the climate control unit and the recirculation control motor.?
4.
Open wire check (RFD-P/FRD-P line):

Open wire check (RFD-P/FRD-P line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Recirculation control motor 7P connector: disconnected
Test point 1
Climate control unit 32P connector No. 6
Test point 2
Body ground

Is there about 5 V?

     
YES
     
     
     
Repair an open in the wire between the climate control unit and the recirculation control motor.?
     
NO
     
     
     
The RFD-P/FRD-P wire is OK. Replace the climate control unit.