WINTER indicator lamp: Notes

Fig 1: Identifying Winter Indicator Lamp Communication Flow Line

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Winter Indicator Lamp Communication Flow Line

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 3: Winter Indicator Lamp - Circuit Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

To make starting easier on slippery road surfaces, the TCM transmission is equipped with a winter mode, i.e. the car starts in 3rd gear when the winter button (W) on the selector lever is pressed.

The lamp is supplied with power in the main instrument unit and grounded internally by the main instrument. TCM continuously sends bus information WINTER ON, unit ON/OFF.

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

The indicator lamp goes out under the following conditions:

• When the Winter button is pressed again.
• When the transmission is in Limp-home mode.
• If the ignition is turned off and then on again.
• The oil temperature in the gearbox is above 140°C.
• Kick-down is activated (returns to WINTER when kick-down is disengaged)
• Gear position L or M is selected