DTC U128D (Telematics Control Unit)

DTC U128D  : Telematics Control Unit Lost Communication with Gauge Control Module

DTC (Telematics System)

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode, and then back to ON mode.

   -3. Wait for at least 6 seconds.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   U128D Telematics control unit lost communication with Gauge control module

   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, B-CAN L lines)

   -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 point 1	Telematics control unit connector A (36P) No. 33
   Test point 2	Gauge control module connector A (32P) No. 30

   Test point 1	Telematics control unit connector A (36P) No. 34
   Test point 2	Gauge control module connector A (32P) No. 31

   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.