Cruise control master switch (Engine management system - Td5)

Cruise control master switch

The cruise control master switch is located on the dashboard. When the driver activates the switch it requests the cruise control system to be active. The switch acts as a latching switch, on the first operation of the switch the cruise control system is activated, when the switch is pressed again the cruise control system is de-activated. The cruise control warning lamp is part of the switch and illuminates when the switch is activated.

Input/Output Input to the cruise control master switch is 12 volts via the main relay. When the switch is pressed the circuit is completed by the ECM providing an earth path for the relay via pin 15 of connector C0658 of the ECM.

The cruise control master switch can fail as follows: l Open circuit. l Short circuit to voltage supply. l Short circuit to vehicle earth. l Wiring loom fault.

In the event of a cruise control master switch failure cruise control does not operate.