cruise control

[van hal]

on our 2002 impala cruise control stopped working i have checked all the fuses plus brake switch and all relays .
could it be in the steering wheel if so that is a big job.
or the control under the hood
any ideas ?
Peter

[chevymandan]

I have an 04 impala and this is what I did to Test it
Pin A: gray - cruise control on switch signal: 12VDC with cruise switch on
Pin B: dark blue - cruise control set/coast switch signal: 12VDC with switch pressed
Pin C: gray/black - cruise control resume/accel switch signal: 12VDC with switch pressed
Pin D: brown - cruise control release signal: 12VDC with brake pedal not pressed: 0V when pressed (this is the smaller and higher up of the 2 brake switches)
Pin E: black/white - ground
Pin F: brown - ignition 3 voltage: 12VDC with ignition on
Pin G: white - stop lamp switch signal: 0V with brake pedal not pressed: 12VDC when pressed (this is the lower larger one of the brake switches)
Pin H: dark green - cruise control inhibit signal: 0.1ohms to ground ,closed circuit when cruise is enabled by PCM (see below)
Pin J: white - cruise control engaged signal: voltage 12VDC signal engaged
Pin K: dark green - vehicle speed signal: AC voltage when driving

To Troubleshoot:
Unplug cruise control module.
Using 2 pieces of thin wire (speaker wire or thermostat) put one end in Pin E which is the ground, and the other end wrapped around the negative lead of the meter. Take the other wire and put it in the Pin you want to test and the other end wrapped around the positive lead. Now you can test all the pins without using another person. Test on Volts DC

You can test all of them except for Pin K and Pin H at this point

To test Pin K, hook up the same way and I placed the wire on the rubber (between the hood and windshield wipers)and closed the hood. Rolled down the window and put the wires through the opening so the wires dont get pinched. Put the meter to Volts AC and have someone else in the car to [COLOR=blue ! important][COLOR=blue ! important]drive[/color][/color] or watch the meter. You should get AC volatage as you drive and it will go away when you stop.

To test Pin H, hook up the same way, but put the meter on Ohms. When you get to a certain speed, temp, and everything is good, the PCM will put the circuit to ground, which will show a closed circuit (close to 0.1 ohms) on your meter. You will notice when you hit the brakes you will get an open (OL) between the two.

If you are unsure how to use a meter or do not have one, you can get a decent one for around $50, which is useful when dealing with any auto or house wiring. They are simple to use, I am sure you can youtube it.

my whole system checked out good so i replaced the cruise module with part ACDelco 12575408 which replaced the GM12575443 for my vehicle. I got it on [COLOR=blue ! important][COLOR=blue ! important]Ebay[/color][/color] new and shipped for $97. Easy to install if you have any sense. I finally got my Cruise light back on and it works like a champ.