DTC : U1281, U128D
DTC U1281 : Auto leveling control unit lost communication with MICU DTC U128D : Auto leveling control unit lost communication with Gauge control unit
NOTE:
- 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 Auto leveling control unit lost communication with MICU | |
| U128D Auto leveling control unit lost communication with Gauge control unit |
DTC (Headlight Leveling Control Unit)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to:
- Problem verification
-1. Clear the DTCs with the HDS.
Clear DTCs
- 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 Auto leveling control unit lost communication with MICU U128D Auto light 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.
Headlight leveling control unit 12P connector - 3. Disconnect the transmitting control unit connectors.
Gauge control module 32P connector 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_L to B-CAN_H wire is OK. Go to step 3.
NO
Repair an open or high resistance in the B-CAN_H and/or B-CAN_L wire (S) between the receiving control unit and the transmitting control unit.
- Determine possible failure area (the receiving control unit or the transmitting control unit)
-1. Reconnect all connectors.
- 2. Turn the vehicle to the ON mode.
- 3. Clear the DTCs with the HDS.
Clear DTCs
- 4. Check for DTCs with the HDS.
DTC Description DTC U1281 Auto leveling control unit lost communication with MICU U128D Auto leveling control unit lost communication with Gauge control unit Are DTC U1281 and U128D indicated?
YES
Check for loose terminals and poor connections in the headlight leveling control unit connector. Check is OK, replace the Headlight Leveling Control Unit - Removal and Installation .
NO
The headlight leveling control unit is OK at this time. Update or replace the transmitting control unit. (Refer to the DTC code shown on the display, and then update or replace the control unit based on the instructions in the table below.)
DTC TRANSMITTING CONTROL UNIT U1281 Auto leveling control unit lost communication with MICU Update or replace the MICU U128D Auto light control unit lost communication with gauge control module Replace the gauge control module