( TL19E00K769000U1280FAAT00 )

DTC Troubleshooting: U1280

DTC U1280:
Communication Bus Line Error (BUS-OFF)

1. Clear the DTCs with the HDS.

1. Turn the ignition switch to LOCK (0) and then back to ON (II).

1. Wait for 6 seconds or more.

1. Check for DTCs with the HDS.

Is DTC U1280 indicated?

YES | - | Go to Step 5 .
NO | - | Intermittent failure, the system is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition and the charging system.■

1. Turn the ignition switch to LOCK (0).

1. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.

   Control Unit | Connector
   --- | ---
   Passenger's MICU | Passenger's under-dash fuse/relay box connector A (38P)
   Door multiplex control unit | 37P connector
   Gauge control module | 32P connector
   Immobilizer-keyless control unit | 7P connector
   Audio unit | Connector B (20P)
   Heater control unit/Climate control unit | Connector B (12P)
   Hands Free Telephone control unit *1 | 28P connector
   Headlight leveling control unit *2 | 16P connector
   Automatic lighting/rain sensor *3 | 6P connector
   Power seat control unit *4 | 40P connector
   Parking and back-up sensor control unit *5 | 16P connector

   *1: | With Hands Free Telephone system
   *2: | With headlight leveling system
   *3: | With automatic wiper
   *4: | With DPMS
   *5: | With parking and back-up sensor system

Is DTC U1280 indicated with each individual unit disconnected?

YES | - | Go to Step 7 .

NO

-

Go to the input test for the control unit that was disconnected when DTC U1280 did not reset and perform all power and ground input tests. If the tests prove OK, replace that unit.■

- Passenger's MICU input test
- Door multiplex control unit input test
- Gauge control unit input test
- Immobilizer-keyless control unit input test
- Heater control unit input test
- Climate control unit input test
- Hands Free Telephone control unit input test
- Headlight leveling control unit input test
- Automatic lighting/rain sensor input test
- Power seat control unit input test
- Parking and back-up sensor control unit input test

1. Turn the ignition switch to LOCK (0).

1. Disconnect each control unit connector in the table.

   Control Unit | Connector
   --- | ---
   Passenger's MICU | Passenger's under-dash fuse/relay box connector A (38P)
   Door multiplex control unit | 37P connector
   Gauge control module | 32P connector
   Immobilizer-keyless control unit | 7P connector
   Audio unit | Connector B (20P)
   Heater control unit/Climate control unit | Connector B (12P)
   Hands Free Telephone control unit *1 | 28P connector
   Headlight leveling control unit *2 | 16P connector
   Automatic lighting/rain sensor *3 | 6P connector
   Power seat control unit *4 | 40P connector
   Parking and back-up sensor control unit *5 | 16P connector

   *1: | With Hands Free Telephone system
   *2: | With headlight leveling system
   *3: | With automatic wiper
   *4: | With DPMS
   *5: | With parking and back-up sensor system

1. Disconnect driver's under-dash fuse/relay box connector P (20P).

1. Check for continuity between driver's under-dash fuse/relay box connector P (20P) No. 5 and No. 6 terminals.

Is there continuity?

YES | - | A short between the B-CAN wires.■
NO | - | Go to Step 11 .