DTC U0104: Gauge Control Module Lost Communication With ACC/Multipurpose Camera Unit

DTC (Gauge Control Module)

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .
• If you have any loss of communication DTCs for the PCM, troubleshoot those DTCs first.

• 1. Problem verification:

  1. Clear the DTCs with the HDS.

  Clear DTCs

  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
  U0104 Gauge Control Module Lost Communication With ACC/Multipurpose Camera Unit

  Is DTC U0104 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 fuses.

  Fuse	No. B24 (7.5 A)
  Location	Under-dash fuse/relay box

  Is each fuse OK?

  YES 

  Go to step 3.

  NO 

  Replace the fuse. If the fuse blows again, repair a short to ground in the No. B24 (7.5 A) fuse circuit.

• 3. Open wire check (IG1 VSA/ABS line):

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

  2. Disconnect the following connector.

  Multipurpose camera unit 20P connector

  3. Turn the vehicle to the ON mode.

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

  Test condition	Vehicle ON mode Multipurpose camera unit 20P connector: disconnected
  Test point 1	Multipurpose camera unit 20P connector No. 19
  Test point 2	Body ground

  Is there battery voltage?

  YES 

  The IG1 VSA/ABS wire is OK. Go to step 4.

  NO 

  Repair an open or high resistance in the wire.

• 4. Open wire check (GND lines):

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

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

  Test point 1	Multipurpose camera unit 20P connector No. 14
  Test point 2	Body ground

  Is there continuity?

  YES 

  The GND wires are OK. Go to step 5.

  NO 

  Repair an open or high resistance in the ground wire or poor ground (G502).

• 5. Open wire check (F-CAN lines):

  1. Disconnect the following connector.

  Gauge control module connector A (32P)

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

  Test condition	Vehicle OFF (LOCK) mode Multipurpose camera unit 20P connector: disconnected Gauge control module connector A (32P): disconnected
  Test point 1	Multipurpose camera unit 20P connector No. 2
  Test point 2	Gauge control module connector A (32P) No. 19

  Test point 1	Multipurpose camera unit 20P connector No. 13
  Test point 2	Gauge control module connector A (32P) No. 20

  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 multipurpose camera unit and the gauge control module.