DTC U0104 (Gauge Control Module) (2014 2015)

DTC U0104 : Gauge Control Module Lost Communication With ACC Unit

DTC Description	DTC
U0104 Gauge Control Module Lost Communication With ACC Unit

DTC (Gauge Control Module)

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

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) .

Go to step 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.

ACC UNIT (Bus B) is Not Available

Go to step 5.

ACC UNIT (Bus C) is Not Available

Go to step 7.

GAUGE CONTROL MODULE and ACC 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 ACC unit.

Open wire check (F-CAN A_H line)

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

-2. Disconnect the following connectors.

Gauge control module connector A (32P)

CAN gateway 24P connector

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

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

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

Is there continuity?

YES

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

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

Open wire check (F-CAN A_L line)

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

Test condition	Vehicle OFF (LOCK) mode
	Gauge control module connector A (32P): disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN A_L
Test point 1	Gauge control module connector A (32P) No. 28 (PNK)
Test point 2	CAN gateway 24P connector No. 15 (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 U0104 is not indicated the gauge control module was substituted, replace the original gauge control module .

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

Open wire check (F-CAN B_H line)

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

-2. Disconnect the following connectors.

ACC unit 20P connector

CAN gateway 24P connector

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

Test condition	Vehicle OFF (LOCK) mode
	ACC unit 20P connector: disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN B_H
Test point 1	ACC unit 20P connector No. 2 (LT BLU)
Test point 2	CAN gateway 24P connector No. 11 (LT BLU)

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

Is there continuity?

YES

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

Repair an open in the F-CAN B_H wire between the ACC unit and the CAN gateway.

Open wire check (F-CAN B_L line)

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

Test condition	Vehicle OFF (LOCK) mode
	ACC unit 20P connector: disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN B_L
Test point 1	ACC unit 20P connector No. 18 (GRY)
Test point 2	CAN gateway 24P connector No. 10 (GRY)

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

Is there continuity?

YES

The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the ACC unit. Update the ACC unit if it does not have the latest software, or substitute a known-good ACC unit , then recheck. If DTC U0104 goes away and the ACC unit was updated, troubleshooting is complete. If DTC U0104 goes away and the ACC unit was substituted, replace the original ACC unit .

Repair an open in the F-CAN B_L wire between the ACC unit and the CAN gateway.

Open wire check (F-CAN C_H line)

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

-2. Disconnect the following connectors.

ACC unit 20P connector

CAN gateway 24P connector

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

Test condition	Vehicle OFF (LOCK) mode
	ACC unit 20P connector: disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN C_H
Test point 1	ACC unit 20P connector No. 4 (PUR)
Test point 2	CAN gateway 24P connector No. 9 (PUR)

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

Is there continuity?

YES

The F-CAN C_H wire is OK. Go to step 8.

Repair an open in the F-CAN C_H wire between the ACC unit and the CAN gateway.

Open wire check (F-CAN C_L line)

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

Test condition	Vehicle OFF (LOCK) mode
	ACC unit 20P connector: disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN C_L
Test point 1	ACC unit 20P connector No. 15 (PNK)
Test point 2	CAN gateway 24P connector No. 8 (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 ACC unit. Update the ACC unit if it does not have the latest software, or substitute a known-good ACC unit , then recheck. If DTC U0104 goes away and the ACC unit was updated, troubleshooting is complete. If DTC U0104 goes away and the ACC unit was substituted, replace the original ACC unit .

Repair an open in the F-CAN C_L wire between the ACC unit and the CAN gateway.