Cruise control troubleshooting

rubberhead · 12-24-2006, 08:10 AM

I have a 1990 C1500 with a cruise control problem. It does absolutely nothing! What part is most likely to fail? I'd say the switch? What is the best approach on troubleshooting my problem?

mudseeker · 12-24-2006, 08:18 AM

could also be a vacum problem. mine coincidently went out while it was at the shop to have the actuater for the 4x4 replaced.

rubberhead · 12-24-2006, 08:25 AM

Quote:

Originally Posted by mudseeker

could also be a vacum problem. mine coincidently went out while it was at the shop to have the actuater for the 4x4 replaced.

Mine doesn't do anything, no dash light, nothing! I took the cover off of the CC actuator module(?) and it looked good and undamaged, wiring looked good, but I didn't notice any vacuum lines. Would this shut down the whole system?

Chevy808 · 12-24-2006, 09:38 AM

Quote:

Originally Posted by rubberhead

Mine doesn't do anything, no dash light, nothing! I took the cover off of the CC actuator module(?) and it looked good and undamaged, wiring looked good, but I didn't notice any vacuum lines. Would this shut down the whole system?

I don't think it has a indicator light for 1990. If there isn't any obvious problems like leaking vacuum, blown fuse or broken wire then the problem probably lies in the switch that sets the speed.

vanhal · 12-24-2006, 09:33 PM

check your brake switch ...i have a 98 and when it does not work it is the brake switch but then i dont know about a 1990 ...just my 2 cents worth ..........pete

rubberhead · 08-13-2007, 08:54 PM

Quote:

Originally Posted by vanhal

check your brake switch ...i have a 98 and when it does not work it is the brake switch but then i dont know about a 1990 ...just my 2 cents worth ..........pete

Does the brake light switch serve more of a purpose than just energizing your brake lights?

crabtruck · 08-13-2007, 09:52 PM

I believe there are 4 wires coming off the column for the cruise control. With the key on look for one to be hot. If not look for problem towards fuse / conv center. If got one, hit on for cruise and there should be a second hot. if not = bad switch. If now 2 hots there, check brake pedal switch for hot from there. Really two sw there and on older a vac sw. Get right sw sholud be easy to see which is which. Lots of those switches went bad and was recall for some years. If good and you have a clutch check same thing there. If all that is good, you have problems with controller, or ecm info, etc. Not common.

And where you been for 8 months ? LOL

12-24-2006, 08:10 AM	#1
rubberhead Full Member Join Date: Dec 2006 Location: Southeast Alabama Posts: 13	Cruise control troubleshooting I have a 1990 C1500 with a cruise control problem. It does absolutely nothing! What part is most likely to fail? I'd say the switch? What is the best approach on troubleshooting my problem?

12-24-2006, 08:18 AM	#2
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,374	could also be a vacum problem. mine coincidently went out while it was at the shop to have the actuater for the 4x4 replaced. __________________ i'd rather be hunting

12-24-2006, 09:33 PM	#5
vanhal Senior Member Join Date: Mar 2005 Location: ontario, canada Posts: 102	cruise control check your brake switch ...i have a 98 and when it does not work it is the brake switch but then i dont know about a 1990 ...just my 2 cents worth ..........pete __________________ I am gm all the way ....... black 98 Z71 3 door short box 5.7

08-13-2007, 09:52 PM	#7
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,364	I believe there are 4 wires coming off the column for the cruise control. With the key on look for one to be hot. If not look for problem towards fuse / conv center. If got one, hit on for cruise and there should be a second hot. if not = bad switch. If now 2 hots there, check brake pedal switch for hot from there. Really two sw there and on older a vac sw. Get right sw sholud be easy to see which is which. Lots of those switches went bad and was recall for some years. If good and you have a clutch check same thing there. If all that is good, you have problems with controller, or ecm info, etc. Not common. And where you been for 8 months ? LOL Last edited by crabtruck; 08-14-2007 at 06:21 AM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
cruise control	vanhal	Chevy Truck Forum	3	12-19-2006 06:09 PM
01 Sierra Cruise & Blower Motor Question	jim5434	GMC Truck Forum	4	08-25-2006 10:55 AM
2001 GMC 2500 Cruise Control Problem	jim5434	GMC Truck Forum	1	07-18-2006 01:03 PM
Cruise Control Lever 1988 Jimmy	cheesebone	GMC Truck Forum	2	06-27-2006 08:44 PM
cruise control	vanhal	Chevy Truck Forum	1	02-11-2006 11:52 PM