Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-1A57

Condition




The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that communication with the road traffic information module (RTI) is not operating.
The diagnostic trouble code (DTC) can be diagnosed when the ignition has been on for more than 10 seconds.

Note! In the event of CEM-1A5X diagnostic trouble codes (DTCs), the central electronic module (CEM) must not be replaced as the diagnostic trouble code (DTC) indicates a communication fault in the controller area network (CAN).

Substitute value
- None.

Possible source
- New software has been downloaded to the road traffic information module (RTI)
- No power supply to road traffic information module (RTI)
- Open-circuit in the ground lead for the road traffic information module (RTI)
- Contact resistance in the terminals
- Open-circuit in the wiring for the CAN low speed network to the road traffic information module (RTI)
- The road traffic information module (RTI) is not intended for this vehicle (for example a used control module with different software/hardware).

Hint: If several diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM) for communication faults with other control modules in the low speed network, this indicates a common fault in the controller area network (CAN). See the relevant wiring diagram.

Fault symptom[s]
- Traffic information is not displayed or updated.
- The display for the road traffic information module (RTI) does not function.