DTC B2643-87 (2021)

DTC B2643-87  : Lost Communication With The Rear Left Center Sensor

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .

DTC (Parking and Back-Up Sensor Control Unit)

1. Problem verification

   -1. Clear the DTCs with the HDS.

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

   -3. Turn the parking and back-up sensor switch to ON.

   -4. Wait for at least 6 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   B2643-87 Lost Communication With The Rear Left Center Sensor

   Is DTC B2643-87 indicated?

   YES 

   Go to step 2.

   NO 

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

2. DTC check

   -1. Check for DTCs with the HDS.

   DTC Description	DTC
   B2642-87 Lost Communication With The Rear Left Corner Sensor
   B2643-87 Lost Communication With The Rear Left Center Sensor
   B2644-87 Lost Communication With The Rear Right Center Sensor
   B2645-87 Lost Communication With The Rear Right Corner Sensor

   Are DTC B2642-87, B2643-87, B2644-87, and B2645-87 indicated?

   YES 

   Go to step 6.

   NO 

   Go to step 3.

   NO 

   Check for loose or poor connections. If OK, replace the parking and back-up sensor control unit .

3. Left rear center sensor check

   -1. Substitute a known-good left rear center sensor .

   -2. Clear the DTCs with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   -4. Turn the parking and back-up sensor switch to ON.

   -5. Wait for at least 6 seconds.

   -6. Check for DTCs with the HDS.

   DTC Description	DTC
   B2643-87 Lost Communication With The Rear Left Center Sensor

   Is DTC B2643-87 indicated?

   YES 

   Go to step 4.

   NO 

   Replace the original left rear center sensor .

4. Shorted wire check (SOR CTR L line)

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

   -2. Disconnect the following connector.

   Left rear center sensor 3P connector

   Parking and back-up sensor control unit 24P connector

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

   Test condition	Vehicle OFF (LOCK) mode Left rear center sensor 3P connector: disconnected Parking and back-up sensor control unit 24P connector: disconnected
   Test point 1	Left rear center sensor 3P connector (female terminals) No. 2:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short to ground in SOR CTR L wire between the left rear center sensor and the parking and back-up sensor control unit.

   NO 

   The SOR CTR L wire is not shorted to ground, go to step 5.

5. Open wire check (SOR CTR 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 24P connector: disconnected Left rear center sensor 3P connector: disconnected
   Test point 1	Parking and back-up sensor control unit 24P connector No. 17
   Test point 2	Left rear center sensor 3P connector (female terminals) No. 2:

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

   Is there continuity?

   YES 

   The SOR CTR L wire is not opened, go to step 6.

   NO 

   Repair an open or high resistance in SOR CTR L wire between the parking and back-up sensor control unit and the left rear center sensor.

6. Open wire check (BOR SIDE L, E2 SIDE L lines)

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

   -2. Disconnect the following connectors.

   Parking and back-up sensor control unit 24P connector

   Left rear center sensor 3P connector

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

   Test condition	Vehicle OFF (LOCK) mode Parking and back-up sensor control unit 24P connector: disconnected Left rear center sensor 3P connector: disconnected
   Test point 1	Parking and back-up sensor control unit 24P connector No. 14
   Test point 2	Left rear center sensor 3P connector (female terminals) No. 3:

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

   Is there continuity?

   YES 

   Repair an open or high resistance in E2 SIDE L wire between the parking and back-up sensor control unit and the left rear center sensor.

   NO 

   Repair an open or high resistance in BOR SIDE L wire between the parking and back-up sensor control unit and the left rear center sensor.