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Cruise control fix- courtesy of Keydiver


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Galant VR-4 org Post #: 298812 posted 01/26/06 07:40 AM     Remind Me!  Send Private Message   Edit Post      
The following is from the original thread, describing the problem and the solution:

My cruise control won't work. Here's what's happening: I turn it on, wait a couple of seconds, then push the set button and it turns off when I do. Anybody had this same problem or have any insight?

Dave,

If it acts up again, you may need to do what I just did to mine last week. My symptoms were EXACTLY like yours: I would turn the cruise on, the little red light was on, but as soon as I hit the "Set" button, the red light went out.

I traced the problem to a little relay that is built into the circuit board that is part of the complete stalk assembly, about $400 from a dealer if I recall! The contacts on the relay get pitted and corroded over time, and resistance builds up. Then, as soon as you put the complete load across the contacts when you try to set the speed, the voltage drops completely across the bad contacts. My solution: I went to Radio Shack and bought a small 12 volt SPDT relay. I removed the stock relay, without removing the complete assembly from the steering column, which was quite a trick in itself. Then, I just soldered 4 small wires on to where the original coil, Common, and NO relay contacts were, and ran them down behind the dash to the new relay. If you're not sure which wire is which, just remember: the tiny blue and white wires are the 2 that go down to the connector harness that get shorted together when the relay is energized, so you want one of them to the Common, and one to the Normally Open contact. The other two relay contacts are the 12-volt coil contacts. Have someone familiar with relays help you out. Good luck, mine worked perfect the whole 1100 miles back to Florida!

Another tip: remove the cap from the top of the original relay, and you will easily be able to see which of the 4 legs on the back are which. You can plainly see which ones lead to the contacts, and which ones lead to the coil of the relay. The hardest part is turning the steering wheel to try to get to all of the screws that hold the assembly on to the steering column. I managed to do the whole job without pulling the steering wheel, or even dropping the column down from the dash.

Have fun!

Link to original thread


edit: If you opt to remove the steering wheel, here's a thread that includes info on that.


Edited by steveVR4 (01/26/06 08:57 AM)

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keydiver
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Galant VR-4 org Post #: 299889 posted 01/28/06 07:19 PM     Remind Me!  Send Private Message   Edit Post   
I can add some pictures:
After you remove the plastic shields under the steering wheel and surrounding the column assembly, you need to rotate the steering wheel, to get at a few screws that hold the assembly in place:

Here's a picture of the whole board, as it is installed into the column switch assembly:

This is what the board looks like once removed from the assembly. The relay in question is in the lower, lefthand corner, with a white plastic cover:

Here's what the relay looks like with its cover removed. If you have a small file, emery board, or some sandpaper, you could try just cleaning up the Common and Normally Open contacts, which are the ones that get pitted from repeated use:

As I've said before, the symptoms are that the red power light will turn off as soon as you hit the "SET" button, killing the cruise control power completely, and you need to turn it back on again.
Good luck!

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