WINTER indicator lamp: Notes

Fig 1: Identifying Winter Indicator Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Winter Indicator Lamp Wiring

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 supplied with current in the main instrument unit and grounded by the MIU's control module. 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.
• When the transmission fluid temperature is above 140 °C.