Headlamp Control Module: Testing and Inspection

Description of frozen values

Explanation
Frozen values are parameter values that are stored when a diagnostic trouble code is generated. Not all parameters can be read out for all diagnostic trouble codes. The parameter values can only be read if they can provide additional information on the prevailing conditions when the code was generated.

Total mileage, value
Measurement range: 0-1,000,000 km
The value indicates the vehicle's total mileage when the Diagnostic Trouble Code (DTC) was generated.

MECU power supply, value
Measurement range: 0 - 63 V
Normal range: 12.0 - 14.5 V
The value indicates the power supply to the central electronic module (CEM) when the diagnostic trouble code was generated.

Passenger compartment temperature, value
Measurement range: -40 till +215 °C
The value indicates the passenger compartment temperature when the diagnostic trouble code was generated.

Outside temperature, value
Measurement range: -40 till +215 °C
The value indicates the outside temperature when the diagnostic trouble code was generated.

Power supply mode, status
The value indicates the status of the power supply mode when the diagnostic trouble code was generated.
Key removed
Key recently removed
Key approved
Ignition off after Accessory position
Accessory position
Accessory position after Ignition on
Ignition on
Running
Start attempt
Signal missing

Speed, value
Measurement range: 0 to 255 km/h (158 mph).
Indicates speed when the diagnostic trouble code was generated.

Steering wheel angle, value
Measurement range: -780 to +780 °.
Indicates current steering wheel angle.
The normal value when the steering wheel and front wheels point straight ahead is approx. 0°.