S40 L4-1.9L Turbo VIN 29 B4204T3 (2001)
The signal from the back-up (reversing) lamp switch controls whether or not all the navigation settings in the audio unit can be changed or not during
GPS navigation.
Substitute value
-
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 back-up (reversing) lamp switch
-
Defective or incorrectly installed back-up (reversing) lamp switch.
Fault symptom[s]
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The settings cannot be changed.
Checking The Back-Up (Reverse) Signal, Audio HU1205
Checking the back-up (reverse) signal, Audio HU1205
Checking the back-up (reverse) signal
Activate the diagnostic menu. See Diagnostic functions Audio HU1205 (audio module) See: Description and Operation/Diagnostic Functions Audio
HU1205 (Audio Module).
Check that the status of the signal from the back-up (reversing) lamp switch can change between "R" and "NOT R" according to 2.1 Circuit check
(parameter c). See Diagnostic functions Audio HU1205 (audio module) See: Description and Operation/Diagnostic Functions Audio HU1205 (Audio
Module).
