DTC B2645-87 (2018 2019 2020)

DTC B2645-87  : Lost Communication with The Rear Right Corner 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
   B2645-87 Lost communication with the rear right corner sensor

   Is DTC B2645-87 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

   Is DTC B2642-87, B2643-87, B2644-87, and/or B2645-87 indicated?

   YES 

   Go to step 3.

   YES 

   Go to step 8.

   YES 

   Go to step 9.

   YES 

   Go to step 10.

   NO 

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

3. Right rear corner sensor check

   -1. Swap the right rear corner sensor and the right front corner 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
   B2645-87 Lost communication with the rear right corner sensor

   Is DTC B2645-87 indicated?

   YES 

   Go to step 4.

   NO 

   Replace the original right rear corner sensor .

4. Determine possible failure area (SOR SIDE R line, power and ground lines)

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

   -2. Disconnect the following connector.

   Right rear corner sensor 6P connector

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode Right rear corner sensor 6P connector: disconnected
   Test point 1	Right rear corner sensor 6P connector (female terminals) No. 6:
   Test point 2	Right rear corner sensor 6P connector (female terminals) No. 4:

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

   Is there about 9 V?

   YES 

   Go to step 5.

   NO 

   Go to step 7.

5. Shorted wire check (SOR SIDE R line to power)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode Right rear corner sensor 6P connector: disconnected
   Test point 1	Right rear corner sensor 6P connector (female terminals) No. 2:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Repair a short to power in SOR SIDE R wire between the right rear corner sensor and the parking and back-up sensor control unit.

   NO 

   The SOR SIDE R wire is not shorted to power, go to step 6.

6. Shorted wire check (SOR SIDE R line)

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

   -2. Disconnect the following 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 Right rear corner sensor 6P connector: disconnected Parking and back-up sensor control unit 24P connector: disconnected
   Test point 1	Right rear corner sensor 6P 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 SIDE R wire between the right rear corner sensor and the parking and back-up sensor control unit.

   NO 

   Repair an open or high resistance in SOR SIDE R wire between the right rear corner sensor and the parking and back-up sensor control unit.

7. Open wire check (BOR SIDE R, E2 SIDE R lines)

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

   -2. Disconnect the following connector.

   Right rear center sensor 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode Right rear corner sensor 6P connector: disconnected Right rear center sensor 6P connector: disconnected
   Test point 1	Right rear corner sensor 6P connector (female terminals) No. 6:
   Test point 2	Right rear center sensor 6P connector (female terminals) No. 5:

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

   Is there continuity?

   YES 

   Repair an open or high resistance in E2 SIDE R wire between the right rear corner sensor and the right rear center sensor.

   NO 

   Repair an open or high resistance in BOR SIDE R wire between the right rear corner sensor and the right rear center sensor.

8. Open wire check (BOR CTR R, E2 CTR R lines)

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

   -2. Disconnect the following connectors.

   Right rear center sensor 6P connector

   Left rear center sensor 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode Right rear center sensor 6P connector: disconnected Left rear center sensor 6P connector: disconnected
   Test point 1	Right rear center sensor 6P connector (female terminals) No. 6:
   Test point 2	Left rear center sensor 6P connector (female terminals) No. 5:

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

   Is there continuity?

   YES 

   Repair an open or high resistance in E2 CTR R wire between the right rear center sensor and the left rear center sensor.

   NO 

   Repair an open or high resistance in BOR CTR R wire between the right rear center sensor and the left rear center sensor.

9. Open wire check (BOR CTR L, E2 CTR L lines)

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

   -2. Disconnect the following connectors.

   Left rear center sensor 6P connector

   Left rear corner sensor 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode Left rear center sensor 6P connector: disconnected Left rear corner sensor 6P connector: disconnected
   Test point 1	Left rear center sensor 6P connector (female terminals) No. 6:
   Test point 2	Left rear corner sensor 6P connector (female terminals) No. 5:

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

   Is there continuity?

   YES 

   Repair an open or high resistance in E2 CTR L wire between the left rear center sensor and the left rear corner sensor.

   NO 

   Repair an open or high resistance in BOR CTR L wire between the left rear center sensor and the left rear corner sensor.

10. 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 corner sensor 6P 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 corner sensor 6P connector: disconnected
    Test point 1	Parking and back-up sensor control unit 24P connector No. 14
    Test point 2	Left rear corner sensor 6P connector (female terminals) No. 6:

    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 corner 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 corner sensor.