Diagnostic Trouble Code CEM-8D09
Condition
The central electronic module (CEM) supplies voltage to the emergency brake light directly via an output.
The diagnostic trouble code is stored if the control module detects:
- Incorrect signal lasts longer than 1 second.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Not activated brake light.
NOTE:
The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.
Substitute Value
- None.
Possible Source
- Contact resistance, oxidation or poor contact in connections.
- Open-circuit in the voltage supply cable.
- Short-circuit to battery voltage in the power supply.
Fault symptom[s]
- Tail light/Brake light does not work
- Tail light/Brake lights constantly lit