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DTC B1C55 (Ventilated Seat Control Unit)

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DTC B1C55  : Driver's Heater Thermistor Circuit Open

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
DTC Description DTC
B1C55 Driver's heater thermistor circuit open  

DTC (Ventilated Seat 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 driver's seat heater switch ON.

    -4. Wait for at least 90 seconds.

    -5. Check for DTCs with the HDS.

    DTC Description DTC
    B1C55 Driver's heater thermistor circuit open  

    Is DTC B1C55 indicated?

    YES 

    Go to step 2.

    NO 

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

  2. Seat heater check 1

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

    -2. Disconnect the following connector.

    Ventilated seat control unit 24P connector

    -3. Measure the resistance between test points 1 and 2, refer to the following table.

    Test condition Vehicle OFF (LOCK) mode
    Ventilated seat control unit 24P connector: disconnected
    Test point 1 Ventilated seat control unit 24P connector No. 12
    Test point 2 Ventilated seat control unit 24P connector No. 22
    GHH397603Courtesy of HONDA, U.S.A., INC.

    Is resistance value within the range?

    YES 

    Replace the ventilated seat control unit .

    NO 

    Go to step 3.

  3. Seat heater check 2

    -1. Disconnect the following connector.

    Driver's seat heater connector A (4P)

    -2. Measure the resistance between test points 1 and 2, refer to the following table.

    Test condition Vehicle OFF (LOCK) mode
    Ventilated seat control unit 24P connector: disconnected
    Driver's seat heater connector A (4P): disconnected
    Test point 1 Driver's seat heater connector A (4P) (male terminals) No. 3:
    Test point 2 Driver's seat heater connector A (4P) (male terminals) No. 4:
    GHH397606Courtesy of HONDA, U.S.A., INC.
    GHH397607Courtesy of HONDA, U.S.A., INC.

    Is resistance value within the range?

    YES 

    Replace the ventilated seat control unit .

    NO 

    Go to step 4.

  4. Open wire check (TH+ DR line)

    -1. Connect terminals A and B with a jumper wire.

    Terminal A Driver's seat heater connector A (4P) (female terminals) No. 3:
    Terminal B Body ground
    GHH397609Courtesy of HONDA, U.S.A., INC.

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

    Test condition Vehicle OFF (LOCK) mode
    Ventilated seat control unit 24P connector: disconnected
    Driver's seat heater connector A (4P): disconnected
    Driver's seat heater connector A (4P): jumped to body ground
    Test point 1 Ventilated seat control unit 24P connector No. 12
    Test point 2 Body ground

    Is there continuity?

    YES 

    Repair an open or high resistance in the TH- DR wire.

    NO 

    Repair an open or high resistance in the TH+ DR wire.

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