cruise control

Hi wjperki, is this for the factory installed cruise control or an aftermarket unit?

For the factory cruise, you may not show any power at the servo unless it is engaged. Many aftermarket units will have two fused connections. One showing constant 12V+ and the other only showing 12V+ when the key is in the "RUN" position. For either it's important that there is resistance to ground on the cold side of the brake (white wire at brake switch) when the pedal is in the normal position (not pressed). If you have any brake lights out, this can prevent the cruise from engaging.

Also, if you do have the factory cruise control, you may want to check at your local library. They should have a Chilton's manual for your vehicle.  

the12volt

this is a factory installed unit.  if you wouldn't see any power at the servo unless the system is engaged, how you troubleshoot?  i guess i'm just not up to speed on the electrical side of my car.  mechanical is no problem.

i guess what i'm trying to figure out is how would i find out if i just have a faulty wire while i parked in my garage?  since i know there is power at the on/off switch and power at the switch on the brake...what next? 

hot side and cold side of the brake.....what's the difference?  i was assuming the hot side of the switch was where the current was going in.  In addition to this stuff, where would i find the cruise control module?  is it under the dash somewhere between the brake switch and the servo?

i really appreciat the help.  i can't afford to have to send this to the shop to do any electrical testing.

Hi wjperki, the hot side of the brake is the lead that always has 12V+ (Orange in your vehicle). The cold side of the brake (White in your vehicle) is the output of the brake switch that rests at ground and shows 12V+ when the pedal is pressed. For a wiring schematic for your factory cruise, try your local library. Many have Chilton manuals in stock available for check out.

Normally on GM vehicles that are out of warranty,  if the problem can't be discovered within half an hour or the unit is found to be bad, I end up replacing the factory unit with an aftermarket cruise and use the existing control arm. This takes a lot less time than hours of troubleshooting the factory unit as well as saving the customer's time and money. You can pick up an aftermarket cruise control for as little as $100 USD, maybe less in your area.

http://www.rostra.com/cruise-control.htm

the12volt

You might try cleaning the plug contacts under the hood. unplug & re-plug several times. G.M. vehicles are known for loosing continuity through the plugs.

I have gotten sevreal units working again this way.

I want to put cruise control on a car and need some help. A more accurate statement would be, I want to move a cruise control unit from one car to another.

Basic info: 1990 Toyota Celica, Manual Trans.

The doner vechile is the same as the user vechile, except the doner has factory cruise control and the user doesn't. (yet)

Now (for reason I don't really want to get into) I don't want to hook up "resume", "coast" etc. All I want is "on-off" and "set".

I have 3 wires in the steering column that goes to the "speed control" module and  to the brake switch. I have 3 wires that run from the "actavator control unit" (under the hood) back to the  "speed control" module and clutch switch.

My question is, what wires do I need (in addition to the about) to complete the circuit? I'm assuming I only need a couple from the "speed control" module.

I know I can buy an aftermarket unit and save myself time and money. However, (in my case)  half the fun is making something work.  Any help would be appreciated. 

trd8

Hi trd8, you'll also need to connect to the VSS (vehicle speed signal) , Ignition, Ground, and possibly a Tach signal. If the two vehicles are the same year and model, trace and double check each wire before you disconnect it and/or make sure you can find it in the new vehicle first and all should go well.   

Cruise Info for '90 Celica: https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1990-93&make=Toyota&model=Celica&ID=18965&type=Cruise

If you need help troubleshooting it once you have it installed, let us know.

the12volt

Let me ask my question in another way. Does anyone know (by color) what wires from the "speed control module" I need to use. Or maybe a diagram or pin out?

Thanks,

trd8

Hi trd8, if no one post the wiring info for your factory cruise here, you can probably find it at the library. Many have Chilton manuals and such available for checkout.

the12volt