DTC U1281, U128D (Keyless Access Control Unit)
DTC U1281 : Keyless Access Control Unit lost communication with MICU
DTC U128D : Keyless Access Control Unit lost communication with 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 Checks .
- Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table below.
- The DTC may be stored due to the grounding failure or the power source failure at the transmitting control unit (the grounding inspection and the power source inspection on each control unit are required prior to this checking process).
| DTC Description | DTC |
|---|---|
| U1281 Keyless Access Control Unit lost communication with MICU | |
| U128D Keyless Access Control Unit Lost Communication with Gauge Control Module |
DTC (Keyless Access Control Unit)
- 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 U1281 Keyless Access Control Unit lost communication with MICU U128D Keyless Access Control Unit Lost Communication with Gauge Control Module Are DTC U1281 or U128D indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
- Open wire check (B-CAN_H, B-CAN_L line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the receiving control unit connector.
Keyless access/TPMS control unit connector C (20P) -3. Disconnect the transmitting control unit connectors.
Gauge control module connector A (32P) Under-dash fuse/relay box connector M (12P) -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 as specified in the table while in the vehicle OFF (LOCK) mode.
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 table).
DTC Operation for transmitting control unit U1281 Under-dash fuse relay box - Refer to: Under-Dash Fuse/Relay Box Removal and Installation (2019) or Under-Dash Fuse/Relay Box Removal and Installation U128D Gauge control module NO
Repair an open or high resistance in the B-CAN_H and/or B-CAN_L wire.