When the ignition switch is in the RUN position, ignition positive voltage is applied on CKT 639 (PNK) to terminal F of the cruise control module. When the cruise control ON/OFF lever switch is moved to the ON position, ignition positive voltage is applied on CKT 397 (GRY) to terminal A of the cruise control module connector. If the brake pedal is not depressed or the cancel lever is not depressed, ignition positive voltage is present on CKT 696 (LT GRN) at the cruise control module terminal D. If the brake pedal is depressed, battery positive voltage (B+) is present on CKT 17 (WHT) at the cruise control module terminal G.

When the cruise control lever switch is moved to the R/A position, ignition positive voltage is applied on CKT 87 (GRY/BLK) to terminal C of the cruise control module. When the cruise control lever switch is moved to the SET/COAST position, ignition positive voltage is present on CKT 84 (DK BLU) at terminal B of the cruise control module. CKT 817 (DK GRN/WHT) at terminal K of the cruise control is the vehicle speed signal input from the PCM. In operation, vehicle speed signal voltage oscillates between a high of battery positive voltage (B+) and a low of 0.5 volts. CKT 150 (BLK) at terminal E of the cruise control module is ground. CKT 396 (LT BLU/BLK) at terminal J of the cruise control module is the cruise control engaged output signal to the PCM. CKT 83 (DK GRN) at terminal H of the cruise control module is the cruise inhibit input signal from the PCM.

The PCM has the ability to disable the cruise control if conditions are detected which would make cruise control operation undesirable. The PCM inhibits cruise control operation under any of the following conditions:

If the cruise status signal on CKT 396 (LT BLU/BLK) indicates that cruise control is still engaged when the PCM is inhibiting cruise control operation, DTC P1554 sets.