DTC U1100 (Gauge Control Module) (2014 2015)

DTC U1100  : Gauge control module lost communication with LKAS control unit

DTC (Gauge Control Module)

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
   U1100 Gauge control module lost communication with LKAS control unit

   Is DTC U1100 indicated?

   YES 

   Go to step 2.

   NO 

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

2. Fuse check

   - 1. Check the following fuse.

   Fuse	No. D11 (7.5 A)
   Location	Driver's under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Replace the fuse. If the fuse blows again, repair a short to ground in the No. D11 (7.5 A) fuse circuit.

3. Open wire check (IG1 METER line)

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

   - 2. Disconnect the following connector.

   LKAS camera/control unit 8P connector

   - 3. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode LKAS camera/control unit 8P connector: disconnected
   Test circuit	IG1 METER
   Test point 1	LKAS camera/control unit 8P connector No. 1 (PNK)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IG1 METER wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the wire.

4. Open wire check (GND 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 LKAS camera/control unit 8P connector: disconnected
   Test circuit	GND
   Test point 1	LKAS camera/control unit 8P connector No. 8 (BLK)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 5.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G501).

5. Open wire check (F-CAN lines)

   - 1. Disconnect the following connectors.

   Gauge control module connector A (32P)

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

   Test condition	Vehicle OFF (LOCK) mode LKAS camera/control unit 8P connector: disconnected Gauge control module connector A (32P) : disconnected
   Test circuit	F-CAN_H
   Test point 1	Gauge control module connector A (32P) No. 27 (WHT)
   Test point 2	LKAS camera/control unit 8P connector No. 3 (WHT)

   Test circuit	F-CAN_L
   Test point 1	Gauge control module connector A (32P) No. 28 (BLK)
   Test point 2	LKAS camera/control unit 8P connector No. 7 (BRN)

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

   Is there continuity?

   YES 

   The F-CAN wires are OK. Replace the gauge control module .

   NO 

   An open or poor connection in the F-CAN wires between the LKAS camera/control unit and the gauge control module.