DTC U129D (Gauge Control Module) (2014 2015 2016 2017)

DTC U129D  : Gauge Control Module Lost Communication With Precision All Wheel Steer Control Unit

NOTE:  Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .

DTC (Gauge Control Module)

1. CAN gateway system DTC check

   -1. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off
   U0047-00 CAN Gateway F-CAN ch B Bus Off
   U0056-00 CAN Gateway F-CAN ch C Bus Off
   U3000-49 CAN Gateway Internal Failure

   Is DTC U0029-00, U0047-00, U0056-00, and/or U3000-49 indicated?

   YES 

   Go to the troubleshooting for CAN gateway system DTC (s) .

   NO 

   Go to step 2.

2. F-CAN circuit communication check

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   Which result is indicated?

   GAUGE CONTROL MODULE (Bus A) is Not Available

   Go to step 3.

   PRECISION ALL WHEEL STEER CONTROL UNIT (Bus C) is Not Available

   Go to step 5.

   GAUGE CONTROL MODULE and PRECISION ALL WHEEL STEER CONTROL UNIT are Detected

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the CAN gateway, and the precision all wheel steer control unit.

3. Open wire check (F-CAN A_H line)

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

   -2. Disconnect the following connectors.

   CAN gateway 24P connector

   Gauge control module connector A (32P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	Gauge control module connector A (32P): disconnected
   Test circuit	F-CAN A_H
   Test point 1	CAN gateway 24P connector No. 14 (BLU)
   Test point 2	Gauge control module connector A (32P) No. 27 (BLU)

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

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 4.

   NO 

   Repair an open in the F-CAN A_H wire between the gauge control module and the CAN gateway.

4. Open wire check (F-CAN A_L line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	Gauge control module connector A (32P): disconnected
   Test circuit	F-CAN A_L
   Test point 1	CAN gateway 24P connector No. 15 (PNK)
   Test point 2	Gauge control module connector A (32P) No. 28 (PNK)

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

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the gauge control module. Substitute a good-known gauge control module , then recheck. If DTC U129D is not indicated the gauge control module was substituted, replace the original gauge control module .

   NO 

   Repair an open in the F-CAN A_L wire between the gauge control module and the CAN gateway.

5. Open wire check (F-CAN C_H line)

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

   -2. Disconnect the following connectors.

   CAN gateway 24P connector

   Precision all wheel steer control unit connector A (16P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	Precision all wheel steer control unit connector A (16P): disconnected
   Test circuit	F-CAN C_H
   Test point 1	CAN gateway 24P connector No. 9 (PUR)
   Test point 2	Precision all wheel steer control unit connector A (16P) No. 6 (PUR)

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

   Is there continuity?

   YES 

   The F-CAN C_H wire is OK. Go to step 6.

   NO 

   Repair an open in the F-CAN C_H wire between the precision all wheel steer control unit and the CAN gateway.

6. Open wire check (F-CAN C_L line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	Precision all wheel steer control unit connector A (16P): disconnected
   Test circuit	F-CAN C_L
   Test point 1	CAN gateway 24P connector No. 8 (PNK)
   Test point 2	Precision all wheel steer control unit connector A (16P) No. 14 (PNK)

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

   Is there continuity?

   YES 

   The F-CAN C_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the precision all wheel steer control unit. Update the precision all wheel steer control unit if it does not have the latest software, or substitute a known-good precision all wheel steer control unit , then recheck. If DTC U129D goes away and the precision all wheel steer control unit was updated, troubleshooting is complete. If DTC U129D is not indicated the precision all wheel steer control unit was substituted, replace the original precision all wheel steer control unit .

   NO 

   Repair an open in the F-CAN C_L wire between the precision all wheel steer control unit and the CAN gateway.