Rheostat
| Rheostat |
| General |
The rheostat is integrated in the main lights switch and gives the SID information on the driver's selected rheostat setting.
The rheostat is a potentiometer which is supplied with +5 V via pin 21 of the control module. The rheostat is grounded through pin 22.
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
| Diagnosis |
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.
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