DTC U128D (Telematics Control Unit)

DTC U128D  : Lost Communication with Meter on B-CAN

DTC (Telematics System)

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• Check the connectors for poor connections or loose terminals.

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
   U128D Lost Communication with Meter on B-CAN

   Is DTC U128D indicated?

   YES 

   The failure is duplicated, go to step 2.

   NO 

   Intermittent failure, the system is OK at this time.

2. Open wire check (B CAN-H line, B CAN-L line)

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

   -2. Disconnect the following connectors.

   Telematics control unit connector A (36P)

   Gauge control module connector A (32P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Telematics control unit connector A (36P): disconnected
   	Gauge control module connector A (32P): disconnected
   Test circuit	B CAN-H
   Test point 1	Telematics control unit connector A (36P) No. 33 (RED)
   Test point 2	Gauge control module connector A (32P) No. 25 (RED)

   Test circuit	B CAN-L
   Test point 1	Telematics control unit connector A (36P) No. 34 (WHT)
   Test point 2	Gauge control module connector A (32P) No. 26 (WHT)

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

   Is there continuity?

   YES 

   Replace the gauge control module .

   NO 

   Repair an open in the wire (s) between the telematics control unit and the gauge control module.