Trouble Shooting
- To resolve any cruise control system malfunction, perform a visual inspection of all components. Check system to ensure there are no blown fuses, damaged or disconnected electrical wires or poor connections. Check high mounted brakelight bulbs; if burned out, cruise control system will not function.
- With ignition switch in RUN position, battery voltage is applied to terminal "F" of cruise control module. See Fig 1. When cruise control switch slider is moved to ON position, battery voltage is applied to terminal "A" of module connector.
- When brake pedal is released, battery voltage should be present at module terminal "D". When brake pedal is depressed, battery voltage should be present at module terminal "G". When cruise switch slider is moved to R/A position, battery voltage should be present at terminal "C" of module connector.
- With SET button depressed, battery voltage should be present at module terminal "B". With vehicle moving faster than 25 MPH, voltage at module terminal "K" will oscillate from 0-5 volts. Module ground is at terminal "E".
Courtesy of GENERAL MOTORS CORP.