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Home >> Acura >> 2017 >> MDX Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Gauge Control System - Diagnostics (Except Hybrid) >> Troubleshooting >> DTC U128F (Gauge Control Module (Without Auto Idle Stop System)) (2014 2015 2016)

DTC U128F (Gauge Control Module (Without Auto Idle Stop System)) (2014 2015 2016)

DTC U128F  : Gauge control module lost communication with BSI unit

DTC Description DTC
U128F Gauge control module lost communication with BSI unit  

DTC (Gauge Control Module)

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2014 2015 2016) .

  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
    U128F Gauge control module lost communication with BSI unit  

    Is DTC U0128F indicated?

    YES 

    Go to step 2.

    NO 

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

  2. Determine possible failure area (BSI radar unit power and ground, B CAN line)

    - 1. Select B-CAN CONTROL UNITS INFORMATION from the BODY ELECTRICAL SYSTEM SELECT menu, and then select CHECK CONNECTED CONTROL UNITS.

    - 2. Check the DETECT/NOT AVAILABLE information of the BSI RADAR UNIT

    Is DETECT indicated?

    YES 

    Go to step 7.

    NO 

    Go to step 3.

  3. Fuse check

    - 1. Check the following fuse.

    Fuse No. F13 (7.5 A)
    Location Rear fuse/relay box

    Is the fuse OK?

    YES 

    Go to step 4.

    NO 

    Replace the fuse. If the fuse blows again, repair a short to ground in the No. F13 (7.5 A) fuse circuit.

  4. Open wire check (IG1 ECU RR line)

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

    - 2. Disconnect the following connector.

    Left side BSI radar unit 6P connector - Refer to:
    BSI Radar Unit Removal and Installation (2016 2017 2018 2019 2020), or
    BSI Radar Unit Removal and Installation (2014 2015)

    - 3. Turn the vehicle to the ON mode.

    - 4. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
    Left side BSI radar unit 6P connector: disconnected
    Test circuit IG1 ECU RR
    Test point 1 Left side BSI radar unit 6P connector No. 1 (LT GRN)
    Test point 2 Body ground
    GHH321813Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The IG1 ECU RR wire is OK. Go to step 5.

    NO 

    Repair an open or high resistance in the wire.

  5. Open wire check (SGND line)

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

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

    Test condition Vehicle OFF (LOCK) mode
    Left side BSI radar unit 6P connector: disconnected
    Test circuit SGND
    Test point 1 Left side BSI radar unit 6P connector No. 6 (BLK)
    Test point 2 Body ground
    GHH321814Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The SGND wire is OK. Go to step 6.

    NO 

    Repair an open or high resistance in the ground wire or poor ground (G605).

  6. Open wire check (B-CAN lines)

    - 1. Disconnect the following connector.

    Gauge control module connector A (32P)

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

    Test condition Vehicle OFF (LOCK) mode
    Left side BSI radar unit 6P connector: disconnected
    Gauge control module connector A (32P): disconnected
    Test circuit B-CAN_H
    Test point 1 Left side BSI radar unit 6P connector No. 3 (PNK)
    Test point 2 Gauge control module connector A (32P) No. 25 (PNK)
    GHH321815Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    An open or poor connection in the B-CAN_L wire between the left side BSI radar unit and the gauge control module.

    NO 

    An open or poor connection in the B-CAN_H wire between the left side BSI radar unit and the gauge control module.

  7. Open wire check (B-CAN lines)

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

    - 2. Disconnect the following connector.

    Left side BSI radar unit 6P connector - Refer to:
    BSI Radar Unit Removal and Installation (2016 2017 2018 2019 2020), or
    BSI Radar Unit Removal and Installation (2014 2015)
    Gauge control module connector A (32P)

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

    Test condition Vehicle OFF (LOCK) mode
    Left side BSI radar unit 6P connector: disconnected
    Gauge control module connector A (32P): disconnected
    Test circuit B-CAN_H
    Test point 1 Left side BSI radar unit 6P connector No. 3 (PNK)
    Test point 2 Gauge control module connector A (32P) No. 25 (PNK)
    GHH321816Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    An open or poor connection in the B-CAN_L wire between the left side BSI radar unit and the gauge control module.

    NO 

    An open or poor connection in the B-CAN_H wire between the left side BSI radar unit and the gauge control module.

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