DTC B2983 (5) (HVAC Control Unit)

DTC B2983 or DTC indicator 5  : A problem in the recirculation control motor circuit, linkage, door, or motor

DTCs (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 HVAC 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 5 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.

   HVAC 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
   	HVAC control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 15
   Test point 2	Recirculation control motor 7P connector (female terminals) 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 HVAC 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
   	HVAC control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 16
   Test point 2	Recirculation control motor 7P connector (female terminals) 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 HVAC 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
   	HVAC control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 15
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to body ground in the wire between the HVAC 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
   	HVAC control unit connector A (32P): disconnected
   	Recirculation control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 16
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to body ground in the wire between the HVAC 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 HVAC control unit .

   NO 

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