DTC : B2649

DTC B2649  : Rear Sensor Signal Short to Ground

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Go to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
• The count of the number of the sensor starts from the sensor near to the control unit.

DTC (Parking and Back-Up Sensor 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
   B2649 Rear sensor signal short to ground

   Is DTC B2649 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 (RSS L, RSG 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. 14 - Refer to: Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Parking and back-up sensor control unit 16P connector No. 12 - Refer to: Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2019 2020 2021) .

   Is there continuity?

   YES 

   Go to step 3.

   NO 

   Go to step 10.

3. Shorted wire check (RSS R, RSG R lines) 1

   - 1. Disconnect the following connector.

   Right rear center 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 Right rear center sensor 6P connector: disconnected
   Test point 1	Right rear center sensor 6P connector (female terminals) No. 3: (1)
   Test point 2	Right rear center sensor 6P connector (female terminals) No. 1: (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 (RSS R, RSG R lines) 2

   - 1. Disconnect the following connector.

   Right rear 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 Right rear center sensor 6P connector: disconnected Right rear corner sensor 6P connector: disconnected
   Test point 1	Right rear center sensor 6P connector (female terminals) No. 3: (1)
   Test point 2	Right rear center sensor 6P connector (female terminals) No. 1: (1)

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

   Is there continuity?

   YES 

   Repair a short in the RSS R and RSG R wires between the right rear center sensor and the right rear corner sensor.

   NO 

   Replace the right Rear Corner Sensor .

5. Shorted wire check (RSS CR, RSG CR lines) 1

   - 1. Reconnect the following connector.

   Right rear center sensor 6P connector

   - 2. Disconnect the following connector.

   Left rear center 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 16P connector: disconnected Left rear center sensor 6P connector: disconnected
   Test point 1	Left rear center sensor 6P connector (female terminals) No. 3: (1)
   Test point 2	Left rear center sensor 6P connector (female terminals) No. 1: (1)

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

   Is there continuity?

   YES 

   Go to step 6.

   NO 

   Go to step 7.

6. Shorted wire check (RSS CR, RSG CR lines) 2

   - 1. Disconnect the following connector.

   Right rear center 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 rear center sensor 6P connector: disconnected Right rear center sensor 6P connector: disconnected
   Test point 1	Left rear center sensor 6P connector (female terminals) No. 3: (1)
   Test point 2	Left rear center sensor 6P connector (female terminals) No. 1: (1)

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

   Is there continuity?

   YES 

   Repair a short in the RSS CR and RSG CR wires between the left rear center sensor and the right rear center sensor.

   NO 

   Replace the right Rear Center Sensor .

7. Shorted wire check (RSS CL, RSG CL lines) 1

   - 1. Reconnect the following connector.

   Left rear center sensor 6P connector

   - 2. Disconnect the following 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 16P connector: disconnected Left rear corner sensor 6P connector: disconnected
   Test point 1	Left rear corner sensor 6P connector (female terminals) No. 3: (1)
   Test point 2	Left rear corner sensor 6P connector (female terminals) No. 1: (1)

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

   Is there continuity?

   YES 

   Go to step 8.

   NO 

   Go to step 9.

8. Shorted wire check (RSS CL, RSG CL lines) 2

   - 1. Disconnect the following connector.

   Left rear center 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 rear corner sensor 6P connector: disconnected Left rear center sensor 6P connector: disconnected
   Test point 1	Left rear corner sensor 6P connector (female terminals) No. 3: (1)
   Test point 2	Left rear corner sensor 6P connector (female terminals) No. 1: (1)

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

   Is there continuity?

   YES 

   Repair a short in the RSS CL and RSG CL wires between the left rear corner sensor and the left rear center sensor.

   NO 

   Replace the left Rear Center Sensor .

9. Shorted wire check (RSS L, RSG 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 rear corner sensor 6P connector: disconnected
   Test point 1	Parking and back-up sensor control unit 16P connector No. 14 - Refer to: Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Parking and back-up sensor control unit 16P connector No. 12 - Refer to: Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2019 2020 2021) .

   Is there continuity?

   YES 

   Repair a short in the RSS L and RSG L wires between the parking and back-up sensor control unit and the left rear corner sensor.

   NO 

   Replace the left Rear Corner Sensor .

10. Shorted wire check (RSS 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. 14 - Refer to: Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Parking and Back-Up Sensor Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short to ground in the RSS L wire.

    NO 

    Replace the Parking and Back-Up Sensor Control Unit .