CHECK GEARBOX indicator lamp: Notes

Fig 1: Checking Gearbox Indicator Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Gearbox Indicator Lamp Wiring

Courtesy of SAAB-SCANIA OF AMERICA, INC.

If there is a fault in the automatic transmission or its control module, the TCM lights the CHECK GEARBOX warning lamp in the main instrument unit.

The lamp is supplied with current (+15 circuit) in the main instrument unit and grounded via terminal 6 (K20) in the transmission control module (TCM).

When the ignition is turned on, the TCM lights the lamp for approx. 3 seconds and if there is no fault the lamp will go out.