Circuit Description

The cruise control module pulls the cruise inhibit circuit up to about 12 volts. When PCM determines that cruise control is allowed, PCM grounds the cruise inhibit circuit. The cruise control module detects the low voltage signal and enables the system. The PCM grounds the cruise inhibit circuit through an internal solid state device called a driver. The driver supplies ground to the component being controlled. Each driver has a fault line which is monitored by the PCM. DTC will set if fault detection circuit senses a voltage other than what is expected.

Conditions for setting DTC are: there is a short to ground, open in circuit, or short to battery voltage is detected on control circuit and fault is present for at least 30 seconds.