1. System Switch Issues:
* Cruise Control Switch: The switch on the steering wheel itself might be faulty. Try pressing it firmly and ensuring it's making good contact. If the switch is worn or broken internally, it will need replacement.
* Brake Pedal Switch: The cruise control disengages automatically when the brake pedal is pressed. A faulty brake light switch can prevent cruise control from engaging or cause it to disengage unexpectedly. This is a common culprit. Check your brake lights – if they don't work, the brake switch is a prime suspect.
* Clutch Pedal Switch (if applicable): Manual transmission Ventures have a clutch pedal switch; if it's faulty, the cruise control won't engage.
2. Vacuum System Problems (Most Likely for Older Models):
* Vacuum Leaks: Cruise control on older vehicles often relies on vacuum to control the throttle. Leaks in the vacuum lines can prevent it from functioning properly. A mechanic can inspect these lines for cracks, holes, or loose connections.
* Vacuum Pump/Booster: If the vacuum pump or booster is failing, it won't supply the necessary vacuum for the cruise control.
3. Electrical Issues:
* Fuses: Check the fuse box for blown fuses related to the cruise control system. Your owner's manual will show you the location of the fuse box and which fuse is responsible.
* Wiring: Worn, corroded, or damaged wiring can interrupt the electrical signal to the cruise control system. This is often harder to diagnose without a wiring diagram and multimeter.
* Cruise Control Module (CCM): This is the electronic control unit for the cruise control. If it's malfunctioning, it may require replacement. This is usually diagnosed by a mechanic using diagnostic tools.
4. Speed Sensor Issues:
* Vehicle Speed Sensor (VSS): The cruise control needs to know the vehicle's speed to maintain it. A faulty VSS will prevent the cruise control from functioning. This sensor typically provides data to the transmission control module (TCM) as well as other systems, so other symptoms like speedometer malfunction may be present.
Troubleshooting Steps:
1. Check the fuses: This is the easiest and quickest check.
2. Inspect the brake lights: If they're not working, the brake light switch is highly suspect.
3. Test the cruise control switch: Make sure it's making good contact.
4. Check your owner's manual: It might offer specific troubleshooting steps or diagnostic codes for your Chevy Venture's cruise control system.
When to See a Mechanic:
If you've checked the fuses, brake lights, and switches, and the cruise control still doesn't work, it's best to take your Venture to a qualified mechanic. They have the tools and expertise to diagnose more complex problems like vacuum leaks, wiring issues, or a faulty CCM. They can also use a scan tool to check for any diagnostic trouble codes (DTCs) stored in the vehicle's computer.
