9-5 SE Wagon (9600) V6-3.0L Turbo (B308) (2001)
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The rheostat is a potentiometer which is supplied with +5 V via pin 21 of the control module. The rheostat is grounded through pin 8.
The voltage across the integral rheostat in the SID is proportional to the actual resistance of the rheostat, see diagram. The SID uses this value to control
the button lighting and calculate the display lighting level.
Information on the rheostat level is sent as bus information, Rheostat level, unit (%). See: Rheostat Level
Diagnostics
An open circuit causes diagnostic trouble code B1736 to be generated.
A short-circuit to ground does not result in a diagnostic trouble code, the rheostat level is at "max" and cannot be altered with the rheostat.
A short-circuit to B+ will destroy the rheostat.
Interior Light Sensor
Interior Light Sensor
General
The sensor which measures the light intensity in the car is integrated in the SID. The measurement range is 0-2000 lux.
The SID uses the value to calculate a suitable display lighting level. The value is sent as bus information "LIGHTING INTENSITY IN CABIN" in lux.
See: Display Lighting Level
Bus Communication
Bus Communication
