DTC U1281, U128F (Gauge Control Module)

DTC U1281  : Gauge Control Module Lost Communication with MICU (Body Control Module) (MICU Frame)DTC U128F  : Gauge Control Module Lost Communication with BSI Unit

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 (s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the gauge control module.
• Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC (Gauge Control Module)

1. Problem verification

   -1. Clear the DTC 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
   U1281 Gauge control module lost communication with MICU (body control module) (MICU frame)
   U128F Gauge control module lost communication with BSI unit

   Are any DTCs indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control units and the gauge control module.

2. Open wire check (B-CAN_H line, B-CAN_L line)

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

   -2. Disconnect the receiving control unit connector.

   Gauge control module connector A (32P)

   -3. According to the detected DTC on the following table, disconnect the transmitting control unit connector (s).

   DTC	Connector
   U1281	Body control module connector A (66P)
   U128F	Left side BSI radar unit 6P connector Right side BSI radar unit 6P connector

   -4. 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 Gauge control module 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
   U1281	B-CAN_H	Gauge control module connector A (32P)	No. 22	Body control module connector A (66P)	No. 54
   	B-CAN_L		No. 23		No. 55
   U128F	B-CAN_H	Gauge control module connector A (32P)	No. 22	Left side BSI radar unit 6P connector	No. 3
   	B-CAN_L		No. 23		No. 5
   U128F	B-CAN_H	Gauge control module connector A (32P)	No. 22	Right side BSI radar unit 6P connector	No. 3
   	B-CAN_L		No. 23		No. 5

   Is there continuity?

   YES 

   The B-CAN_H wire and the B-CAN_L wire are OK.

   According to the detected DTC on the following table, substitute or replace the control unit based on the instructions (see table).

   DTC	Operation for transmitting control unit
   U1281	Substitute a known-good body control module , then recheck. If DTC U1281 goes away after substitution, replace the original body control module .
   U128F	Substitute a known-good left side BSI radar unit and right side BSI radar unit , then recheck. If DTC U128F goes away after substitution, replace the original BSI radar unit .

   NO 

   Repair an open in the B-CAN_H wire and/or the B-CAN_L wire between the gauge control module and the transmitting control unit.