U0126

U0126

Diagnostic information - CAN

Communication with control unit not possible

NOTE: Internal function test completed.

Diagnostic conditions
The PAS control unit initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.
Wake-up of the control unit by:
- Event-controlled CAN message
- Key contact (terminal S)
- Ignition ON

Possible fault causes
- No power supply of the control unit
- Incorrect coding of the control unit
- Short circuit or open circuit in CAN network
- Control unit faulty (in most cases, faulty coding is the cause and not the control unit)

Fault effects
- Communication no longer possible via the CAN bus
- The control unit is no longer addressable for all other control units