Cruise control power source

[mkc1962]

I'm Adding cruise to my 2000 TJ. Vehicle was prewired from factory and I have checked all wires for continuity/ All ok. I found a mount correct servo for my 2000 as well as the switches for the steering wheel, switches tested good for function based on continuity checks based on FSM schematic. Solid vacuum source. Brake kill ckt tests ok. ALL connections for the system test good. I Installed a new Clock spring as that was the only item it did not have. But no CRUISE light activation at startup or when pushing the ON/OFF button.

I assume a bulb is in the cruise socket from the factory? but even if its not, there is no action going down the road. I've never seen a failed or lacking bulb to cause issues with a cruise,

Based on FSM section on speed control, the PCM sends a 5v signal to the wheel on/off switch so I assume there is not another fuse of any sort on the cruise system? Surely cant find one.

I have yet to check for 5v coming into the switch. But assume if I don't see 5v at the switch, coming in from Pin32/C3 there is possibly an issue with the PCM Cruise output?

 

[Luke Markham]

Can't speak to the voltage on the switches, but to test the bulb in the dash you can hold the trip button (next to the odometer) down when you turn the key to the on position. This initializes a self test that will run through every light in the gauge cluster. That will at least confirm the bulb works.

As for the switches, are you sure the switches have the correct resistance? Different years have switches with differing resistance values. Don't remember what they are or the year ranges, but I'm sure someone will post them.

 

[mkc1962]

Can't speak to the voltage on the switches, but to test the bulb in the dash you can hold the trip button (next to the odometer) down when you turn the key to the on position. This initializes a self test that will run through every light in the gauge cluster. That will at least confirm the bulb works.

As for the switches, are you sure the switches have the correct resistance? Different years have switches with differing resistance values. Don't remember what they are or the year ranges, but I'm sure someone will post them.

Thanks for the tip on the test. I just went out to shop and tried that.....Cruise light came on, so not the bulb.

I got the switches from an ebay jeep parts seller, he had them listed for my year, they have the part number 56009437 which is the same part number I have seen a few on here as well as Utube for the 2000 vintage. But at the same time have seen what you mention about the resistors. I had to break these down and clean the contacts to make them work proper, while in there checked the resistors, I show 900 ohm on one of them and 6600 ohm on the other.,,, The O2 FSM I have shows a third resistor across the switches (not on mode), but there is no third in my switches. I read in the FSM a 3rd was added just to aid in diagnostic testing.

Would be nice to know what the resistor values are supposed to be just for reference. Easy enough to change them if need be. Have done some searching but not found any values. Only comments about the subject.

 

[Luke Markham]

https://www.wranglerforum.com/threads/cruise-control-switch-differences.1106466/

Found this relating to the resistance values. Can't verify this is correct, but the numbers listed for the older style switches looks right compared to when I installed cruise on my 98.

 

[mkc1962]

https://www.wranglerforum.com/threads/cruise-control-switch-differences.1106466/

Found this relating to the resistance values. Can't verify this is correct, but the numbers listed for the older style switches looks right compared to when I installed cruise on my 98.

I see that mentions for a 2004, I Just read a post that shows the values I am reading on the switches I have as specific to a 98.
https://wranglertjforum.com/threads/97-cruise-control-resistance-values.57575/
I found another post that shows various part numbers for various years. The part number on the one I have is none of these, but these could be superseded
1997 56007530AB and 56007531AB,
1998 56007530AC and 56007531AC,
1999-2002 56007530AD and 56007531AD
2003-2006 56042310AC and 56042311AC

nothing about various resistance values, especially for a 2000

 

[mkc1962]

After many hours of searching the other night I've found lots of data I plan to post here for others as it relates to resistor values and model years. But im out of town at moment and will do so when back home.

I did prove it's not a 5v from pcm issue, and due to my research have found that my 2000 model needs a 500ohm for the ON/OFF function. Making headway, but still a ways to go.

 

[mkc1962]

It appears that many sellers of these switches clearly market them as fitting 97-06, which is clearly not true. Just about every year between those ranges, the internal resistor values as well as physical makeup of the switches is somewhat different. For example, a set of 97/98 switches cannot be made to have a cancel function, as the 3 cluster section is actually just a 2 section with one going straight to ground (0 ohms no place to have a resistor)....but who needs a cancel anyway, early cruises never had them. Also there is not much info on this subject all in one place, rather scattered all over many posts on several jeep forums. Here is what I have discovered and what worked for my 2000 TJ.

By using many forum posts as well as checking as many tech/diagnostic manuals as I could find, I obtained the resistor values for various years. I started with a quick functional check, by changing the ON/OFF resistor to see could I even get the CRUISE Light to come on. I only got success when I got to the value for the 2005 model year (ON/OFF = 500 / .5k ohm). I also had to add the 20.3K across the 2 supply leads (seen in the 2005 schematic below). to get the cruise to stay engaged. In the case of my 2000, the 2005 values worked for me.

I might add the following if you find yourself in this same situation. Testing the resistor values you have is quite easy. Opening the switches is easy, gaining access the the existing resistors is easy, but from there its a bit tougher than just an easy solder job. I worked as an electronics tech near my entire working career, soldering circuits was a very common thing. The internals of these switches is a very hard thick brass fittings, they don't like to take solder very well at all. I suggest if possible, break the center section of the resistor and leave the leads then solder to the old leads. The OE leads are factory arc placed, not soldered. I drilled tiny holes outside the connection point and mounted my new resistors on the back side of the push button section having the leads come up and over to the old leads (the ones I was able to leave)

Hope this helps others should they be in the same situation

MODERATOR, for the benefit of future searchers, it would be nice if you could change the title of this thread to maybe say, CRUISE CONTROL RESISTOR VALUES COMPILED

This is the unit I had bought being sold as works with a 2000.....it did not.

2005

2006

 

[Cprems]

This is great info. I bookmarked it for future use. I'm having issues with my CC. Can you tell me what pins on the C3 PCM connector to check for continuity? I have checked pin 4, 5 &11 and all have continuity to the servo and Pin 11 to the brake inside the vehicle. I feel that I'm missing one to check (pin 32?) But I only have 31 pinholes in my C3 connector. Hope this makes sense.

 

[Moglocker]

I'm Adding cruise to my 2000 TJ. Vehicle was prewired from factory and I have checked all wires for continuity/ All ok. I found a mount correct servo for my 2000 as well as the switches for the steering wheel, switches tested good for function based on continuity checks based on FSM schematic. Solid vacuum source. Brake kill ckt tests ok. ALL connections for the system test good. I Installed a new Clock spring as that was the only item it did not have. But no CRUISE light activation at startup or when pushing the ON/OFF button.

I assume a bulb is in the cruise socket from the factory? but even if its not, there is no action going down the road. I've never seen a failed or lacking bulb to cause issues with a cruise,

Based on FSM section on speed control, the PCM sends a 5v signal to the wheel on/off switch so I assume there is not another fuse of any sort on the cruise system? Surely cant find one.

I have yet to check for 5v coming into the switch. But assume if I don't see 5v at the switch, coming in from Pin32/C3 there is possibly an issue with the PCM Cruise output?

When I did mine it wouldn’t work until I got the correct speedo gear in the t case.but if I recall I had the light,probably have the wrong switches.

 

[mkc1962]

This is great info. I bookmarked it for future use. I'm having issues with my CC. Can you tell me what pins on the C3 PCM connector to check for continuity? I have checked pin 4, 5 &11 and all have continuity to the servo and Pin 11 to the brake inside the vehicle. I feel that I'm missing one to check (pin 32?) But I only have 31 pinholes in my C3 connector. Hope this makes sense.

Based on your profile I see you also have a 2000 TJ, here are the PCM pinouts that I used as found in the 2002 FSM. I was able to check ALL of the wires from the CC back to the ECM.

C3 is the GRAY one all the way to the left of the PCM as you look at it sitting behind the battery. they are 1,2,3 right to left.

 

[mkc1962]

When I did mine it wouldn’t work until I got the correct speedo gear in the t case.but if I recall I had the light,probably have the wrong switches.

The wrong switches will work IF you have the proper resistor values to match the voltages that the PCM wants to see. Only issue on mine was the cancel switch. There was no way to insert a 3rd resistor for it. I had the 97-98 year switches but have a 2000. on the 97-98 the cancel is a zero resistance which on the 97/98 switches is buss configured to just be a direct short of the contact points on the buss....On the 2000 you need a 900 ohm for the cancel function. There was just no place to install one. Works great, just no cancel function.

 

[Moglocker]

The wrong switches will work IF you have the proper resistor values to match the voltages that the PCM wants to see. Only issue on mine was the cancel switch. There was no way to insert a 3rd resistor for it. I had the 97-98 year switches but have a 2000. on the 97-98 the cancel is a zero resistance which on the 97/98 switches is buss configured to just be a direct short of the contact points on the buss....On the 2000 you need a 900 ohm for the cancel function. There was just no place to install one. Works great, just no cancel function.

I used 2000 xj switches on my 2002 tj

 

[Cprems]

Based on your profile I see you also have a 2000 TJ, here are the PCM pinouts that I used as found in the 2002 FSM. I was able to check ALL of the wires from the CC back to the ECM.

C3 is the GRAY one all the way to the left of the PCM as you look at it sitting behind the battery. they are 1,2,3 right to left.

View attachment 590922

View attachment 590923

I have traced C4, 5 and 11. I do not have C32 on my plug. last one labeled is C31. I'll count them tomorrow to make sure. Thanks for the pin out. It'll give me something to track down.

 

[mkc1962]

I have traced C4, 5 and 11. I do not have C32 on my plug. last one labeled is C31. I'll count them tomorrow to make sure. Thanks for the pin out. It'll give me something to track down.

All the pins are numbered on the face of the plug, Not easy to see, but there.

 

[Cprems]

All the pins are numbered on the face of the plug, Not easy to see, but there.

Now that I have counted - I do in fact have 32 pins. Now I am trying to find out where C32 enters the vehicle.

 

[mkc1962]

Now that I have counted - I do in fact have 32 pins. Now I am trying to find out where C32 enters the vehicle.

Matters not how they enter the vehicle, just check point to point if your wanting to confirm

 

[Cprems]

View attachment 591107

Matters not how they enter the vehicle, just check point to point if your wanting to confirm

View attachment 591109

View attachment 591107

I have continuity from the PCM Pin 4, 5, 11 and 32. Got the brake switch and through the clockspring and into the switches. Checking to see if they're the correct ones and will check resistance throught them

 

[Cprems]

The resistances were close to the 2005. I don't know if they need to be closer. I have all the pins and plugs checked out and still no engagement. My dash cluster doesn't have the cruise control sign on it or the symbol. I'm wondering If I need to go get one from pullapart? The servo also holds vacuum and no vacuum leaks on the Jeep.

 

[Moglocker]

The resistances were close to the 2005. I don't know if they need to be closer. I have all the pins and plugs checked out and still no engagement. My dash cluster doesn't have the cruise control sign on it or the symbol. I'm wondering If I need to go get one from pullapart? The servo also holds vacuum and no vacuum leaks on the Jeep.

Get the correct switches

 

[mkc1962]

The resistances were close to the 2005. I don't know if they need to be closer. I have all the pins and plugs checked out and still no engagement. My dash cluster doesn't have the cruise control sign on it or the symbol. I'm wondering If I need to go get one from pullapart? The servo also holds vacuum and no vacuum leaks on the Jeep.

the values, whatever year they match, needs to be very close to the values for the year. For example for the 2005 switches, the ON/OFF should be around 500 ohm, but may be 490-510 usually resistors tolerance tends to be on the high side. my 500 is 509....give or take a few ohm is ok.

You and I both have 2000 model TJ's.

In my case due to not having the proper switches I found that the values for the 2005 switch is what worked for my 2000 PCM. I did try the values for the 2000 first but it did not work. If the light comes on and stays on you should be good. If you are showing the values for the 2005, (without having altered them) then you should also have the 20.3 - 20.7K across the 2 wires for all the switches without any switches being pushed. That resistor is what keeps the cruise on once told to turn on.

IN my case in order for the light to come on the engine had to be running, once I discovered the 2005 were the values that worked for my PCM the light would only come on then go off until I added the 20.3K....I just added it across one of the plugs was easier than trying to install in the actual switch housing.

If you can find the exact switch that is great, but as stated in my case had I bought a definite set of 2000 switches, then would not have worked for me as my PCM needed the 2005 values.

BE SURE AND DO THE LIGHT TESTING AS SEEN IN POST 2 ABOVE. THIS WILL PROVE IF YOUR CRUISE LIGHT IS WORKING OR NOT. If my bottom of the line TJ sport has it, no doubt your Sahara does.