V40 L4-1.9L Turbo VIN 29 B4204T3 (2002)
In case of this defect, troubleshooting is not followed by verification.
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Attempt New Test - Checking display
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Fault-Tracing Information
Fault-tracing information
Condition
The rheostat signal to the audio unit comes from the central electronic module (CEM). The signal is used to set the luminance of the front panel on the
audio unit to match the other instrument lighting in the car.
Substitute value
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None.
Possible source
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Contact resistance or oxidation in the connectors
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Open-circuit, short-circuit to ground or short-circuit to voltage in the signal cable between the audio unit and the central electronic module
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Faulty signal from the central electronic module (CEM).
Fault symptom[s]
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The rheostat function on the audio unit is not working.
