Transmission high temperature warning lamp (Instruments)

Transmission high temperature warning lamp

The transmission high temperature warning lamp within the instrument pack utilises a red LED and a clear legend. On vehicles fitted with automatic gearboxes, the transmission high temperature warning lamp is utilised to provide the driver with a visible warning that the automatic gearbox oil has exceeded a normal operating temperature. The warning lamp will extinguish if the gearbox oil returns back to normal operating temperature.

When the ignition is switched on, the instrument pack illuminates the LED to provide a self-check, providing there is no fault it will remain illuminated for 3 seconds or until the ignition is switched off.

The power input for the LED is supplied by the instrument pack via fuse 13. The temperature sensor provides the earth path to illuminate the transmission high temperature warning lamp.

The transmission high temperature warning lamp is controlled according to the voltage present on the temperature sensor to instrument panel earth path: l < 1.8 volts = warning lamp on. l > 7.7 volts = warning lamp off.