Diagnosis Procedure
1.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Main line between HVAC and A-bag circuitBack-up lamp
Wiring Diagram
...
U1000 CAN comm circuit
Description
Refer to LAN-24, "CAN Communication Signal Chart".
DTC Logic
DTC DETECTION LOGIC
DTC
Trouble diagnosis name
DTC detecting condition
Possible cause
U1000
CAN COMM CIRCUIT
Driver seat control unit cannot communicate to other control
units.
...
U0100 lost communication (ECM A)
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PREPARATION BEFORE WORK
If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition
switch OFF and wait for at
least 10 seconds, then perform the next test.
2.PERFORM DTC CONFIRMATION PROCEDURE
Start the en ...