ZJ Cruise Doesn't work

ZJ5point2GCL · 10-01-2009, 03:40 AM

HI,
I have looked through everything else, but i was hoping somebody had and ideas. My cruise hasn't worked since i bought the jeep, its a 93 so no dash light but, i have replaced the servo 3 times from the wrecker think i was getting bad ones. i put new vacuum line from the manifold to the servo and the vacuum revisor (which holds vacuum, doesn't leak) and i replaced the check valve (right off manifold, before tubing). so after i fixed the all the vacuum lines i test for voltage at the servo connector, when the jeep is just idling or off there is no power, also no power when the cruise switch is off but when i start driving and attempt to turn it on 12 something volts come to all three positive leads. I originally thought it was going to be an easy fix, because when i first bought it it didn't work, but the line going to the servo was broken off. Also i just replaced the clock spring, due to an unrelated issue.

Thanks for your Help!

**Marcos** · 10-01-2009, 08:27 AM

Maybe the brake switch

**HighLonesome** · 10-01-2009, 09:03 AM

There is a 12vdc CC enable that runs through the steering wheel switch, clockspring, brake switch and then on up to the servo. Check for that 12vdc at the servo with the ignition on and the CC enabled. If it's not there (I'm betting it isn't), trace it on back to the source. You really need a diagram. This is how I found a broken wire in my steering column harness.

ZJ5point2GCL · 10-01-2009, 02:20 PM

Quote:

Originally Posted by five.nein

There is a 12vdc CC enable that runs through the steering wheel switch, clockspring, brake switch and then on up to the servo. Check for that 12vdc at the servo with the ignition on and the CC enabled. If it's not there (I'm betting it isn't), trace it on back to the source. You really need a diagram. This is how I found a broken wire in my steering column harness.

Ok Thanks I'll try that today, if there is no 12vdc at any of the terminals at the servo, would it work to give power to one of them or a combination to get the servo to "pull" at idle ?

ZJ5point2GCL · 10-01-2009, 02:21 PM

Ok Thanks I'll try that today, if there is no 12vdc at any of the terminals at the servo, would it work to give power to one of them or a combination to get the servo to "pull" at idle ? - oops srry new to the forum didn't mean to post twice

ZJ5point2GCL · 10-01-2009, 02:25 PM

Quote:

Originally Posted by Marcos

Maybe the brake switch

I don't think it is, because my remote start works fine, which cuts out when you touch the breaks. And my lights go on and off when they should.

**ZeJokee** · 10-01-2009, 02:40 PM

Check your brake switch. I had cruise control problems too. I had a remote start installed and it worked fine with the brake switch, my lights and everything else worked fine too except the cruise and overdrive. As soon as I replaced it my cruise control worked and my overdrive worked correctly too.
What are your RPMS when you are cruising 55mph?

ZJ5point2GCL · 10-01-2009, 02:53 PM

Quote:

Originally Posted by ZeJokee

Check your brake switch. I had cruise control problems too. I had a remote start installed and it worked fine with the brake switch, my lights and everything else worked fine too except the cruise and overdrive. As soon as I replaced it my cruise control worked and my overdrive worked correctly too.
What are your RPMS when you are cruising 55mph?

Oh really? ok then I ll check it, I'll probably see it pretty quick but is the break switch obvious ? is there any way of testing it? like wit a multi meter? I am trying to think what rpms its at, i take it for a cruise this afternoon, i do remember that it was considerably higher that my first jeep, and it should have been lower because of oversized tires. I might be wrong but i am also thinking that the light by the od switch doesn't come on anymore if i take it off, but i don't remember if it actually made a difference in the engine speed, if it was on or off. I ll get back to you with the 55mph RPMs, Thanks for your help.
Oh just for a baseline what should the rpms be ? or what is yours at?

**ZeJokee** · 10-01-2009, 02:59 PM

Mine was at 2200 before I replaced the switch, no I am at 1800 or so at 55mph after replacing it. The switch is easy to find. I believe if you hold the gas lightly and the press the brake or tap while driving it should kick you out of overdrive, if it does not then it is probably bad. I think that is the only way to test it, I sure you can do it with a meter but never thought to try.

frankie_b11 · 10-01-2009, 02:59 PM

I have a problem getting it to turn on from the steering wheel. I have to press the button like 10 times before it comes on. Anybody know an easy fix? Do I have to take the wheel apart and clean or exchange something.
Thanks

**ZeJokee** · 10-01-2009, 03:02 PM

You should be able to pull the switch out and clean it or swap it with a different one. Mine did this before it quit working totally, it could also be your brake switch going bad

StellaTheZJ · 10-01-2009, 03:58 PM

Mine cuts off when I decelerate for a while, and then it will not come on until I shut the Jeep off, and restart. Otherwise, it seems to work very well. Anyone seen that kind of thing?? Anyone know how it might be fixed?

**ZeJokee** · 10-01-2009, 04:07 PM

vacuum perhaps?

**HighLonesome** · 10-01-2009, 04:51 PM

Quote:

Originally Posted by ZJ5point2GCL

Ok Thanks I'll try that today, if there is no 12vdc at any of the terminals at the servo, would it work to give power to one of them or a combination to get the servo to "pull" at idle ?

Not sure, but I'm thinking that if you applied the 12vdc directly, the brakes nor the on/off switch would shut off the CC.

tomk864 · 10-01-2009, 07:18 PM

I just replaced the steering wheel on my 96 ZJ last weekend.
The one I picked up from the junk yard came with the cruise control switches.

Before the change, my cruise on/off switch was flaky. I'd have to try several times to get action.
The "new" switch seems to be much better.

Re. how hard? The important thing is to disconnect the battery and wait 5 minutes to disable the airbag!
After that, it's pretty simple. 3 bolts on the back side of the wheel to pull the airbag module. Then a simple screw holds in the switch. I doubt that it's something one could clean.

tomk