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Old 04-14-2004, 10:28 AM   #1
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Default Need Help Diagnosing Cruise Problem on 94

My cruise control on my 94SE doesn't work. Here is what I have verified as far as I can. Fuse OK in fuse panel. 3rd barke light bulb OK. Vacuum lines in good shape. Good vacuum at servo. Brake switch functions correctly. Servo is free and internal solenoid seems to operate properly.

I'm think it is the switch. Before I buy a new one, is there any reasonably easy way to verify it is the switch by wiring up a couple of switches (momentary or rocker to replace on-off and set buttons) to see if it is indeed the turn signal stalk switch.

Has someone done this and can anybody provide details? I don't mind buying a new switch if I know for sure that'* it but I don't want to buy a switch only to find out it is something else.

Any help would be appreciated.
Thanks,

Mike
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Old 04-14-2004, 12:01 PM   #2
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The easiest way to check it is to hook up a scantool and drive it. The PCM monitors part of the CC system.
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Old 04-14-2004, 12:13 PM   #3
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Default Need Help Diagnosing Cruise Problem on 94

I'd love to do that but I don't have ascan tool and the local GM dealer wants $40.00 to check the codes.
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Old 04-15-2004, 12:59 AM   #4
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Don is on the money here, too. Other than simply replacing parts one by one, there really isn't a good way to do this. We don't simply mean pulling codes, either. We're talking about a 'drivealong' to verify all the individual components. Even your TPS is a suspect at this point. Too many variables.
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Old 04-16-2004, 02:00 PM   #5
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Quote:
Originally Posted by willwren
Don is on the money here, too. Other than simply replacing parts one by one, there really isn't a good way to do this. We don't simply mean pulling codes, either. We're talking about a 'drivealong' to verify all the individual components. Even your TPS is a suspect at this point. Too many variables.
Replacing the switch is a major investment in time and effort to do just on the theory that it might fix the problem. At minimum I think you'd want to check for the correct voltages, etc., at the underdash connector where the harness going up the steering column to the switch plugs in.

Having said that, I have had personal experience with the thin-gauge wires to the switch breaking inside their insulation at the point where they jump the gap from steering column to turn-signal lever, from flexing when signalling turns over the years. However, this was easy to diagnose since the system did still work most of the time, but would fall out of cruise mode if you wiggled the turn-signal lever while driving. If yours is completely DOA right now, I wouldn't go pulling the steering column apart in the absence of any clear proof that that'* where the problem is.

I'm sure the manual has one or more problem-diagnosis trees on this problem, and it'll really help you to locate a copy.
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