SET+/RES switches (Engine management system - V8)

SET+/RES switches

The cruise control system uses two steering wheel switches labelled SET+ and RES.

The SET+ switch performs the set speed, tap up and accelerator functions. The RES switch performs the resume and suspend functions.

With the cruise control master switch on and the vehicle in the cruise control operating speed range, one press of the SET+ switch stores a speed value in the cruise control ECU. If the switch is pressed and held while the vehicle is under cruise control operation, speed increases until the switch is released. At this point the cruise control ECU stores the new speed value. If the switch is tapped (held down for less than 0.5 second) the cruise control ECU increases vehicle speed by 1 mph (1.5 km/h).

If the RES switch is pressed while the systems is inactive (no stored values) the system will not respond. If there is a stored value in the cruise control ECU memory and the switch is pressed, the cruise control system operates and holds the vehicle at the stored road speed. If the cruise control system is active and the RES switch is depressed, the cruise control ECU deactivates cruise operation but maintains the current set speed value.

Input/Output The input from the SET+ switch to the cruise control ECU is either 12 Volts or an open circuit.

The input from the RES switch to the cruise control ECU is either 12 Volts or an open circuit.

The following diagnostic information is available through TestBook: l The state of operator switch SET+. l The state of operator switch RES.

ECU operating parameters (connector connected)