DTC U0155-00: Lost Communication With The Gauge Control Module (Multi Purpose Camera Unit) (With ACC)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Adaptive Cruise Control (ACC) and How to Troubleshoot the Collision Mitigation Braking System (CMBS) .

1. CAN gateway system DTC check

   -1. Turn the vehicle to the ON mode.

   - 2. 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

   DTC Description	DTC
   U3000-49 CAN Gateway Internal Failure

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

   YES 

   Go to the indicated DTCs troubleshooting.

   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.

   Multipurpose camera unit (Bus A) is Not Available

   Go to step 4.

   Multipurpose camera unit and gauge control module are Detected

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting - Refer to: How to Troubleshoot the Adaptive Cruise Control (ACC) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

3. Open wire check (F-CAN A_L, F-CAN A_H lines)

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

   - 2. Disconnect the following connectors.

   CAN gateway 24P connector

   Gauge control module 32P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	Gauge control module 32P connector: disconnected
   Test point 1	CAN gateway 24P connector No. 15
   Test point 2	Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Connector for Inputs and Outputs (Without SH-AWD) (2015-17) or Gauge Control Module Connector for Inputs and Outputs (With SH-AWD) (2015-17) or Gauge Control Module Connector for Inputs and Outputs (2018-19)

   Test point 1	CAN gateway 24P connector No. 14
   Test point 2	Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Connector for Inputs and Outputs (Without SH-AWD) (2015-17) or Gauge Control Module Connector for Inputs and Outputs (With SH-AWD) (2015-17) or Gauge Control Module Connector for Inputs and Outputs (2018-19)

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

   Is there continuity?

   YES 

   Check for loose terminals in the CAN gateway 24P connector and the gauge control module 32P connector. If they are OK, substitute a known-good gauge control module , then recheck. If DTC U0155-00 is not indicated after substitution, replace the gauge control module .

   NO 

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

4. Open wire check (F-CAN A_L, F-CAN A_H lines)

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

   - 2. Disconnect the following connectors.

   CAN gateway 24P connector

   Multipurpose camera unit 20P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	Multipurpose camera unit 20P connector: disconnected
   Test point 1	CAN gateway 24P connector No. 15
   Test point 2	Multipurpose camera unit 20P connector No. 13 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2015-17) or Multipurpose Camera Unit Connector for Inputs and Outputs (2018-19)

   Test point 1	CAN gateway 24P connector No. 14
   Test point 2	Multipurpose camera unit 20P connector No. 2 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2015-17) or Multipurpose Camera Unit Connector for Inputs and Outputs (2018-19)

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

   Is there continuity?

   YES 

   The F-CAN A_L and F-CAN A_H wires are OK. Go to step 5.

   NO 

   Repair an open in the wire between the CAN gateway and the multipurpose camera unit.

5. Multipurpose camera unit check (update)

   -1. Reconnect the following connectors.

   CAN gateway 24P connector

   Multipurpose camera unit 20P connector

   - 2. Update the multipurpose camera unit if it does not have the latest software.

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

   - 4. Turn the vehicle to the ON mode, then wait for at least 5 seconds.

   - 5. Check for DTCs with the HDS.

   Is DTC U0155-00 indicated?

   YES 

   Check for loose terminals in the multipurpose camera unit 20P connector. If the multipurpose camera unit was updated and the symptom/indication is still present, replace the multipurpose camera unit .

   NO 

   Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTC's troubleshooting.