SHIFT UP indicator lamp: Notes

Fig 1: SHIFT UP Indicator Lamp Communication Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: SHIFT UP Indicator Lamp Circuit Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

To achieve low fuel consumption, the SHIFT-UP indicator lamp on the main instrument unit lights up when a higher gear should be engaged.

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

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

When the shift has been made, the engine control module changes the status of the information to SHIFT UP OFF and the lamp goes out.