Section 35 (Cruise Control Systems): Operation: Switch

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The speed control system has 5 separate resistive switches that provide a single multiplexed (MUX) voltage inputs to the PCM. The switch names are ON, OFF, SET COAST, RESUME, ACCEL, COAST and CANCEL. Based on conditions when the buttons are pushed and released, the 5 voltage ranges provided to the PCM result in the following functions: ON, OFF, SET, COAST, RESUME, ACCEL, COAST and CANCEL.

Also the PCM receives an input from the brake switch to sense whether the brake pedal has been depressed. When the PCM receives the brake depressed input, it turns off power to the cruise control servo and disengages cruise control. Also the power to the servo is supplied through the brake switch, which opens the circuit when the brake pedal is depressed. The individual switches cannot be repaired. If one switch fails, the entire switch module must be replaced.