SHIFT UP indicator lamp: Notes

Fig 1: Identifying Communication Diagram - SHIFT UP Indicator Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Communication Circuit Diagram - SHIFT UP Indicator Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

To achieve low fuel consumption, the SHIFT UP indicator lamp in the main instrument unit comes on when a higher gear should be engaged (certain markets).

The lamp is powered by the main instrument unit and is grounded internally by the main instrument unit. The engine control module sends continuous bus information SHIFT-UP, unit ON/OFF.

On receiving SHIFT-UP ON, the control module grounds the output for the lamp which then lights up.

If a higher gear is engaged, the engine control module will change the status of the information to SHIFT-UP OFF and the lamp will go out.