Selector lever position indicator

Fig 1: Identifying Communication Diagram - Selector Lever Position Indicator

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Communication Circuit Diagram - Selector Lever Position Indicator

Courtesy of SAAB-SCANIA OF AMERICA, INC.

On cars with automatic transmission, the selector lever position indicator shows which gear is selected by lighting up the corresponding gear symbol.

The selector lever position indicator consists of 7 segments, each with an LED beside the corresponding symbol (PRND321). The symbols are illuminated by a lamp, the brightness of which is controlled by the rheostat value.

The LEDs and the lamp are powered from the main instrument unit and grounded by the main instrument unit control module. TCM sends continuous bus information on all the selector lever positions, unit ON/OFF.