DTC: U128F(Gauge Control Module) (2016 2017 2018 2019 2020 2021 2022)

DTC U128F  : Gauge Control Module Lost Communication With BSI Radar 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 .

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Press the engine start/stop button to select the OFF 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 Radar 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 5.

   NO 

   Go to step 3.

3. Fuse check

   -1. Check the following fuse.

   Fuse	No. B6 (7.5 A)
   Location	Under-dash 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. B6 (7.5 A) fuse circuit.

4. Open wire check (IG1 OPTION line)

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Disconnect the following connector.

   Left side BSI radar unit 6P connector

   -3. Press the engine start/stop button to select the ON mode.

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

   Test condition	ON modeLeft side BSI radar unit 6P connector: disconnected
   Test circuit	IG1 OPTION
   Test point 1	Left side BSI radar unit 6P connector No. 1 (WHT)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Repair an open or high resistance in the ground wire or poor ground (G701).

   NO 

   Repair an open or high resistance in the wire.

5. Open wire check (B CAN-H line)

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Disconnect the following connector.

   Left side BSI radar unit 6P connector

   Gauge control module 32P connector

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

   Without color multi-information display (MID) 

   Test condition	OFF modeLeft side BSI radar unit 6P connector: disconnectedGauge control module 32P connector: 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 32P connector No. 7 (PNK)

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

   With color multi-information display (MID) 

   Test condition	OFF modeLeft side BSI radar unit 6P connector: disconnectedGauge control module 32P connector: 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 32P connector No. 25 (PNK)

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

   Is there continuity?

   YES 

   The B CAN-H wire is OK. Go to step 6.

   NO 

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

6. Open wire check (B CAN-L line)

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

   Without color multi-information display (MID) 

   Test condition	OFF modeLeft side BSI radar unit 6P connector: disconnectedGauge control module 32P connector: disconnected
   Test circuit	B CAN-L
   Test point 1	Left side BSI radar unit 6P connector No. 4 (BLU)
   Test point 2	Gauge control module 32P connector No. 8 (BLU)

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

   With color multi-information display (MID) 

   Test condition	OFF modeLeft side BSI radar unit 6P connector: disconnectedGauge control module 32P connector: disconnected
   Test circuit	B CAN-L

   Test point 1	Left side BSI radar unit 6P connector No. 4 (BLU)
   Test point 2	Gauge control module 32P connector No. 26 (BLU)

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

   Is there continuity?

   YES 

   The B CAN-L wire is OK. Replace the left side BSI radar unit .

   NO 

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