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 .
• The connection order of the sensor is 1st -> 2nd -> 3rd -> 4th from the side near the control unit.

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. 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 (SOR_SIDE_L, E2_SIDE_L lines) 1

   -1. Disconnect the following connector.

   Parking and back-up sensor control unit 16P connector

   -2. Measure the resistance 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
   Test point 2	Parking and back-up sensor control unit 16P connector No. 12

   Is there 1.0 MΩ or more?

   YES 

   Go to step 10.

   NO 

   Go to step 3.

3. Shorted wire check (SOR_SIDE_R, E2_SIDE_R lines) 1

   -1. Disconnect the following connector.

   Right rear center sensor 6P connector

   -2. Measure the resistance 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:
   Test point 2	Right rear center sensor 6P connector (female terminals) No. 1:

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

   Is there 1.0 MΩ or more?

   YES 

   Go to step 5.

   NO 

   Go to step 4.

4. Shorted wire check (SOR_SIDE_R, E2_SIDE_R lines) 2

   -1. Disconnect the following connector.

   Right rear corner sensor 6P connector

   -2. Measure the resistance 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:
   Test point 2	Right rear center sensor 6P connector (female terminals) No. 1:

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

   Is there 1.0 MΩ or more?

   YES 

   Replace the right rear corner sensor .

   NO 

   Repair a short in the SOR_SIDE_R and E2_SIDE_R wires.

5. Shorted wire check (SOR_CTR_R, E2_CTR_R 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. Measure the resistance 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:
   Test point 2	Left rear center sensor 6P connector (female terminals) No. 1:

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

   Is there 1.0 MΩ or more?

   YES 

   Go to step 7.

   NO 

   Go to step 6.

6. Shorted wire check (SOR_CTR_R, E2_CTR_R lines) 2

   -1. Disconnect the following connector.

   Right rear center sensor 6P connector

   -2. Measure the resistance 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:
   Test point 2	Left rear center sensor 6P connector (female terminals) No. 1:

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

   Is there 1.0 MΩ or more?

   YES 

   Replace the right rear center sensor .

   NO 

   Repair a short in the SOR_CTR_R and E2_CTR_R wires.

7. Shorted wire check (SOR_CTR_L, E2_CTR_L 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. Measure the resistance 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:
   Test point 2	Left rear corner sensor 6P connector (female terminals) No. 1:

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

   Is there 1.0 MΩ or more?

   YES 

   Go to step 9.

   NO 

   Go to step 8.

8. Shorted wire check (SOR_CTR_L, E2_CTR_L lines) 2

   -1. Disconnect the following connector.

   Left rear center sensor 6P connector

   -2. Measure the resistance 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:
   Test point 2	Left rear corner sensor 6P connector (female terminals) No. 1:

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

   Is there 1.0 MΩ or more?

   YES 

   Replace the left rear center sensor .

   NO 

   Repair a short in the SOR_CTR_L and E2_CTR_L wires.

9. Shorted wire check (SOR_SIDE_L, E2_SIDE_L lines) 2

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

   Test condition	Vehicle OFF (LOCK) mode Left rear corner sensor 6P connector: disconnected Left rear corner sensor 6P connector: disconnected
   Test point 1	Parking and back-up sensor control unit 16P connector No. 14
   Test point 2	Parking and back-up sensor control unit 16P connector No. 12

   Is there 1.0 MΩ or more?

   YES 

   Replace the left rear corner sensor .

   NO 

   Repair a short in the SOR_SIDE_L and E2_SIDE_L wires.

10. Shorted wire check (SOR_SIDE_L line)

    -1. Measure the resistance 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
    Test point 2	Body ground

    Is there 1.0 MΩ or more?

    YES 

    Replace the parking and back-up sensor control unit .

    NO 

    Repair a short to ground in the SOR_SIDE_L wire.