DTC B2983 (N and Windshield Defrost)

DTC B2983 or DTC indicator N and WINDSHIELD DEFROST  : A Problem in the Recirculation Control Motor Circuit, Linkage, Door, or Motor

DTC (AC)

1. Problem verification

   - 1. Clear the DTCs with the HDS.

   - 2. Turn the vehicle to the OFF (LOCK) mode 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
   B2983 A problem in the recirculation control motor circuit, linkage, door, or motor

   Is DTC B2983 or N and WINDSHIELD DEFROST indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the recirculation control motor circuit.

2. Open wire check (M REC line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connectors.

   Climate control unit connector A (32P)

   Recirculation control motor 7P connector

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 15 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	Recirculation control motor 7P connector No. 6

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The M REC wire is not open. Go to step 3.

   NO 

   Repair an open in the wire between the climate control unit and the recirculation control motor.

3. Open wire check (M FRS line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 16 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	Recirculation control motor 7P connector No. 7

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The M FRS wire is not open. Go to step 4.

   NO 

   Repair an open in the wire between the climate control unit and the recirculation control motor.

4. Shorted wire check (M REC line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 15 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to body ground in the wire between the climate control unit and the recirculation control motor.

   NO 

   The M REC wire is OK. Go to step 5.

5. Shorted wire check (M FRS line)

   - 1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 16 - Refer to: Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021), or Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to body ground in the wire between the climate control unit and the recirculation control motor.

   NO 

   The M FRS wire is OK. Go to step 6.

6. Recirculation control motor check

   - 1. Test the recirculation control motor.

   Is the recirculation control motor OK?

   YES 

   Replace the climate control unit .

   NO 

   Replace the recirculation control motor , or repair the recirculation control linkage or door.