Printable View
I am trying to figure out why the cruise control on my 92 IROC R/T Stopped working. I have checked the electrical connections, checked for vacuum. I replaced the vacuum servo. I checked the fuse. Still nothing. Does anyone have any other things to check or perhaps the troubleshooting list form the service manual. I am stumped.
Next on the list is to check resistance on the wires between the servo and SBEC.
Your speed sensor is functioning, correct?
Yes, my speedometer reads correctly.
Have you looked at the brake switch yet? That would be my next place to go.
What should I check on the brake switch? I know that it is functional for the tail lights. I tested the clutch switch, and that is still operating properly.
I had a problem with my cruise not working. Went through the steps of troubleshooting skipping the most important of checking for loose connections. When I went under the dash to check the brake switch I found that there was a connector under the dash for the brake switch that was not seated properly. I'm pretty sure my brake lights were working, but the cruise disable portion is a different wire than the brake lights. Pushed the connector back together and haven't had a problem since.
I had an issue with the brake switch a few weeks ago when I installed my remote start. I pulled up the wiring diagrams and I will check to make sure the wire that goes from the switch to the sbec is connected.
Update to come!
Yeah, it is a different switch for the cruise cars vs. the non cruise cars. There are a couple more wires running to it. I would think that a loose connection could be the cause or just the part of the switch that effects cruise could fail too.
Took the brake switch out of the car tonight, The SBEC grounded side of the switch was not working, I had the brake switch blow apart a few weeks ago. Anyways I "rebuilt" the switch tested the wire that goes from the switch to the SBEC and that was function right in the end. I took the car out for a drive and the cruise control worked one or twice. I am going to go ahead and pick up a new brake from the JY and try replacing it. I think mine is faulty. So I found the cause and I also have a solution. I call that a success.
Bradd be aware that there are 4 and 6 wire brake switches on factory cars depending on whether it had cruise or not. When I checked a couple years ago Rock Auto had very inexpensive aftermarket brake switches. They were as cheap as salvage yard. All aftermarket are 6 wire to my knowledge.
Thanks Todd,
I drove the car into work today and if I push up on the brake pedal, I can get the cruise to work. I am thinking the tab that holds the switch in needs a small tweak to hold the switch firmly. Happy to find the problem.
Looked on Rockauto and the switch is 20. I will just run to the JY and pull a couple. Always good to have spares!
Bent the tabs tighter on the clip that retains the brake switch and reinstalled my switch. Cruise working perfectly now!
Gald you got it working and was something simple.