DTC B2646

DTC B2646  : Front sensor power failure

DTC (Parking and Back-Up Sensor Control Unit)

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• The connection order of the sensor is 1st (left corner sensor) -> 4th (right corner sensor) from the side near the control unit.

1. Problem verification

   -1. Clear the DTCs with the HDS.

   Clear DTCs

   -2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   -3. Wait for at least 6 seconds.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   B2646 Front sensor power failure

   Is DTC B2646 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Shorted wire check (FSP L, FSG L lines) 1

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

   -2. Disconnect the following connector.

   Parking and back-up sensor control unit 16P connector

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

   Test condition	Vehicle OFF (LOCK) mode Parking and back-up sensor control unit 16P connector: disconnected
   Test point 1	Parking and back-up sensor control unit 16P connector No. 7
   Test point 2	Parking and back-up sensor control unit 16P connector No. 13

   Is there continuity?

   YES 

   Go to step 3.

   NO 

   Go to step  6.

3. Shorted wire check (FSP R, FSG R lines lines) 1

   -1. Disconnect the following connector.

   Left front corner sensor 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode Parking and back-up sensor control unit 16P connector: disconnected Left front corner sensor 6P connector: disconnected
   Test point 1	Left front corner sensor 6P connector (female terminals) No. 5:
   Test point 2	Left front corner sensor 6P connector (female terminals) No. 1:

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

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   Go to step  5.

4. Shorted wire check (FSP R, FSG R lines lines) 2

   -1. Disconnect the following connector.

   Right front corner sensor 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode Parking and back-up sensor control unit 16P connector: disconnected Left front corner sensor 6P connector: disconnected Right front corner sensor 6P connector: disconnected
   Test point 1	Left front corner sensor 6P connector (female terminals) No. 5:
   Test point 2	Left front corner sensor 6P connector (female terminals) No. 1:

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

   Is there continuity?

   YES 

   Repair a short in the wires.

   NO 

   Replace the right front corner sensor .

5. Shorted wire check (FSP L, FSG L lines) 2

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

   Test condition	Vehicle OFF (LOCK) mode Parking and back-up sensor control unit 16P connector: disconnected Left front corner sensor 6P connector: disconnected
   Test point 1	Parking and back-up sensor control unit 16P connector No. 7
   Test point 2	Parking and back-up sensor control unit 16P connector No. 13

   Is there continuity?

   YES 

   Repair a short in the wires.

   NO 

   Replace the left front corner sensor .

6. Shorted wire check (FSP L line)

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

   Test condition	Vehicle OFF (LOCK) mode Parking and back-up sensor control unit 16P connector: disconnected
   Test point 1	Parking and back-up sensor control unit 16P connector No. 7

   Test point 2

   Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   Replace the parking and back-up sensor control unit .