DTC B1248 (8)

DTC B1248 or DTC indicator 8  : A Problem in the Rear Mode 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
   B1248 A problem in the rear mode control motor circuit, linkage, door, or motor

   Is DTC B1248 or 8 indicated?

   YES 

   Go to step 2.

   NO 

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

2. Open wire check (M-HEAT RR line)

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

   - 2. Disconnect the following connectors.

   HVAC control unit connector A (32P)

   Rear mode 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
   	Rear mode control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 27
   Test point 2	Rear mode control motor 7P connector No. 6

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

   Is there continuity?

   YES 

   The M-HEAT RR wire is not open. Go to step 3.

   NO 

   Repair an open in the wire between the HVAC control unit and the rear mode control motor.

3. Open wire check (M-VENT RR line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector A (32P): disconnected
   	Rear mode control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 28
   Test point 2	Rear mode control motor 7P connector No. 7

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

   Is there continuity?

   YES 

   The M-VENT RR wire is not open. Go to step 4.

   NO 

   Repair an open in the wire between the HVAC control unit and the rear mode control motor.

4. Shorted wire check (M-HEAT RR line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector A (32P): disconnected
   	Rear mode control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 27
   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 rear mode control motor.

   NO 

   The M-HEAT RR wire is OK. Go to step 5.

5. Shorted wire check (M-VENT RR line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	HVAC control unit connector A (32P): disconnected
   	Rear mode control motor 7P connector: disconnected
   Test point 1	HVAC control unit connector A (32P) No. 28
   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 rear mode control motor.

   NO 

   The M-VENT RR wire is OK. Go to step 6.

6. Rear mode control motor check

   - 1. Test the rear mode control motor.

   Is the rear mode control motor OK?

   YES 

   Replace the HVAC control unit .

   NO 

   Replace the rear mode control motor , or repair the rear mode control linkage or door.