CEM-DF01

Diagnostic trouble code (DTC) information CEM-DF01

Condition




The central electronic module (CEM) checks the voltage in the CAN wiring in the low speed network. The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers an open-circuit in CAN H or CAN L in the low speed network.

Note! The central electronic module (CEM) is the only control module that monitors the voltage level in the Control area network wiring. The central electronic module (CEM) is the only control module that can directly store diagnostic trouble codes (DTCs) for an open-circuit in these conductors. However other control modules can store diagnostic trouble codes (DTCs) as a result of the open-circuit. Do not replace the central electronic module (CEM) in the event of a CAN fault unless VIDA fault-tracing has indicated that the central electronic module (CEM) has an internal fault.

The diagnostic trouble code (DTC) can be diagnosed when the ignition has been on for more than 10 seconds.

Substitute value
- None.

Possible source
- Open-circuit in one of the control area network (CAN) cables on the low speed network
- Contact resistance in the terminals.

Fault symptom[s]
- No gauges working.
- The lighting in the instrument panel does not function.
- The central locking system does not function at all.