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DTC B2646

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DTC B2646  : Front sensor power failure

NOTE: 

DTC Description DTC
B2646 Front sensor power failure  

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
    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 (BOF_SIDE_L, E1_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. 7
    Test point 2 Parking and back-up sensor control unit 16P connector No. 13

    Is there 1.0 MΩ or more?

    YES 

    Go to step 10.

    NO 

    Go to step 3.

  3. Shorted wire check (BOF_SIDE_R, E1_SIDE_R lines) 1

    -1. Disconnect the following connector.

    Right front 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 front center sensor 6P connector: disconnected
       
    Test point 1 Right front center sensor 6P connector (female terminals) No. 5:
    Test point 2 Right front center sensor 6P connector (female terminals) No. 1:
    GHH380277Courtesy 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 (BOF_SIDE_R, E1_SIDE_R lines) 2

    -1. Disconnect the following connector.

    Right front 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 front center sensor 6P connector: disconnected
    Right front corner sensor 6P connector: disconnected
       
    Test point 1 Right front center sensor 6P connector (female terminals) No. 5:
    Test point 2 Right front center sensor 6P connector (female terminals) No. 1:
    GHH380280Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 MΩ or more?

    YES 

    Replace the right front corner sensor .

    NO 

    Repair a short in the BOF_SIDE_R and E1_SIDE_R wires.

  5. Shorted wire check (BOF_CTR_R, E1_CTR_R lines) 1

    -1. Reconnect the following connector.

    Right front center sensor 6P connector

    -2. Disconnect the following connector.

    Left front 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 front center sensor 6P connector: disconnected
       
    Test point 1 Left front center sensor 6P connector (female terminals) No. 5:
    Test point 2 Left front center sensor 6P connector (female terminals) No. 1:
    GHH380283Courtesy 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 (BOF_CTR_R, E1_CTR_R lines) 2

    -1. Disconnect the following connector.

    Right front 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 front center sensor 6P connector: disconnected
    Right front center sensor 6P connector: disconnected
       
    Test point 1 Left front center sensor 6P connector (female terminals) No. 5:
    Test point 2 Left front center sensor 6P connector (female terminals) No. 1:
    GHH380286Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 MΩ or more?

    YES 

    Replace the right front center sensor .

    NO 

    Repair a short in the BOF_CTR_R and E1_CTR_R wires.

  7. Shorted wire check (BOF_CTR_L, E1_CTR_L lines) 1

    -1. Reconnect the following connector.

    Left front center sensor 6P connector

    -2. Disconnect the following connector.

    Left front 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 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:
    GHH380289Courtesy 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 (BOF_CTR_L, E1_CTR_L lines) 2

    -1. Disconnect the following connector.

    Left front 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 front corner sensor 6P connector: disconnected
    Left front center 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:
    GHH380292Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 MΩ or more?

    YES 

    Replace the left front center sensor .

    NO 

    Repair a short in the BOF_CTR_L and E1_CTR_L wires.

  9. Shorted wire check (BOF_SIDE_L, E1_SIDE_L lines) 2

    -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
    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 1.0 MΩ or more?

    YES 

    Replace the left front corner sensor .

    NO 

    Repair a short in the BOF_SIDE_L and E1_SIDE_L wires.

  10. Shorted wire check (BOF_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. 7
    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 BOF_SIDE_L wire.

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