LEMON Manuals: Even more car manuals for everyone
Home >> Acura >> 2020 >> ILX >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Seat Heater System (Front) - Diagnostics (Except Hybrid)) >> DTC Troubleshooting >> DTC B1C57

DTC B1C57

WARNING: This page is about a different car, the 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, and 2018 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1C57  : Passenger'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
B1C57 Passenger's heater thermistor circuit open  

DTC (Front Seat Heater 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 front passenger's seat heater switch ON.

    -4. Wait for at least 90 seconds.

    -5. Check for DTCs with the HDS.

    DTC Description DTC
    B1C57 Passenger's heater thermistor circuit open  

    Is DTC B1C57 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.

    Front seat heater 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
    Front seat heater control unit 24P connector: disconnected
    Test point 1 Front seat heater control unit 24P connector No. 13
    Test point 2 Front seat heater control unit 24P connector No. 23
    GHH397729Courtesy of HONDA, U.S.A., INC.

    Is resistance value within the range?

    YES 

    Replace the front seat heater control unit .

    NO 

    Go to step 3.

  3. Seat heater check 2

    -1. Disconnect the following connector.

    Front passenger'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
    Front seat heater control unit 24P connector: disconnected
    Front passenger's seat heater connector A (4P): disconnected
    Test point 1 Front passenger's seat heater connector A (4P) (male terminals) No. 3:
    Test point 2 Front passenger's seat heater connector A (4P) (male terminals) No. 4:
    GHH397732Courtesy of HONDA, U.S.A., INC.
    GHH397733Courtesy of HONDA, U.S.A., INC.

    Is resistance value within the range?

    YES 

    Replace the front seat heater control unit .

    NO 

    Go to step 4.

  4. Open wire check (TH+ AS line)

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

    Terminal A Front passenger's seat heater connector A (4P) (female terminals) No. 3:
    Terminal B Body ground
    GHH397735Courtesy of HONDA, U.S.A., INC.

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

    Test condition Vehicle OFF (LOCK) mode
    Front seat heater control unit 24P connector: disconnected
    Front passenger's seat heater connector A (4P): disconnected
    Front passenger's seat heater connector A (4P): jumped to body ground
    Test point 1 Front seat heater control unit 24P connector No. 13
    Test point 2 Body ground

    Is there continuity?

    YES 

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

    NO 

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

scientia non olet · About LEMON Manuals