DTC U128D (Telematics Control Unit)
DTC U128D : Telematics Control Unit Lost Communication with Gauge Control Module
| DTC Description | DTC |
|---|---|
| U128D Telematics control unit lost communication with Gauge control module |
DTCs (Telematics System)
NOTE:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
- According to the detected DTC, check for the power circuit and the ground circuit of the control unit which cannot communicate with the telematics control unit.
- Check the connectors for poor connections or loose terminals.
- Problem verification
-1. Clear the DTCs with the HDS.
-2. Turn the vehicle to the OFF (LOCK) mode.
-3. Open the driver's door, and wait more than 1 minute.
-4. Turn the vehicle to the ON mode.
-5. Wait for at least 6 seconds.
-6. 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.
- Open wire check (B-CAN H line, B-CAN L line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Open the driver's door, and wait more than 1 minute.
-3. Disconnect the receiving control unit connector.
Telematics control unit connector A (32P) -4. Disconnect the transmitting control unit connector (s).
Refer to the DTC shown on the display, then disconnect the connector (s) based on the instructions (see table).
DTC Connector U128D Gauge control module connector A (32P) -5. Check for continuity between the receiving control unit and the transmitting control unit on the B-CAN H circuit and the B-CAN L circuit.
Test condition Vehicle OFF (LOCK) mode Telematics control unit connector A (32P): disconnected Transmitting control unit connector (s) for indicated DTCs: disconnected DTC Circuit name Receiving control unit Transmitting control unit Connector Terminal Connector Terminal U128D B-CAN H Telematics control unit connector A (32P) No. 22 Gauge control module connector A (32P) No. 31 B-CAN L No. 23 No. 30 Is there continuity?
YES
The B-CAN H wire and the B-CAN L wire are OK. Refer to the DTC shown on the display, then replace the control unit based on the instructions (see chart).
DTC Operation for transmitting control unit U128D Gauge control module NO
Repair an open in the B-CAN H wire and/or the B-CAN L wire.