WINTER indicator lamp: Notes

Fig 1: Identifying WINTER Indicator Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Communication Diagram - WINTER Indicator Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

To facilitate moving off on slippery road surfaces, the TCM has a winter mode, i.e. the car starts in 3rd gear when the Winter button (W) beside the selector lever is depressed.

The lamp is powered by the main instrument unit and is grounded internally by the main instrument unit. TCM sends continuous bus information WINTER ON, unit ON/OFF.

When WINTER ON is active, the control module will ground the output for the lamp, which then comes on.

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.
• When the transmission fluid temperature is above 140°C.