Cadillac Repair: auto theft warning/random start on 91 cadillac seville, cadillac seville, gauge wires

Question
First, Thanks for this help and other Q & A's i've read.

I bought my 91 cadillac seville 2 years ago. When I bought it, it had a starting problem, but would start seconds later. Overtime and after a few things have been worked on, the anti theft/wait 3 mins. would pop up, the car would start after that. Well now, 2 yrs later, since it has been heating up outside, It won't start (randomly, but def. not when its been sitting in the sun for a while). I have had to wait up to 45 mins for it to finally start. I found that fideling with the temp (off and auto) seems to kick it in gear, then it starts, of course after i wait another 3 mins. for the anti theft warnings.      I did find these codes when i ran that test:
RO26
RO33
RO61
Clear Sir? I did.

I am thinking it has something to do with the ignition lock/switch/column, the wiring/or computer. but my cadillac dealer told me its probably the starter with a big maybe. but they didn't know what the problem was when i bought it from them either.

Any help/ideas appreciated, Thanks!!

Answer
Hi irritated,

    
   I think you have the right idea in that the ignition lock cylinder is the problem. Whats happening is that the 2 small 20 gauge wires coming down from the ignition lock cylinder have broken in half and the only thing holding the wire ends together is the insulation. Here's what you need to do to prove that right.

    Look under the dash below the steering column (you will need to remove the panel under the dash if you haven't already) You will see 2 white wires with an orange coating at a 2 wire connector...those are the wires coming from the lock cylinder. Take your key and ohmmeter and place a meter lead on each side of the pellet and see what the resistance is. Then put the key in the ignition and install the meter leads from the backside of the connector after unplugging it so they touch the terminal and wedge against the plastic connector cavity to the side going to the steering column. At that point the meter should show the same resistance. Turn the ignition key from lock to start at least 10 times and the resistance should remain the same. If not then the wire is open and the lock cylinder needs to be replaced along with the 2 keys to keep it factory. However if all you want is a quick fix...and this will allow the engine to start if the vehicle is broken into...is to wire a 1/4 watt resistor as close to the value you got but soldiering one white wire to each end of the resistor after cutting the wire. The resistor needs to go on the fuse box side. Radio Shack is where I go for resistors.

    As for the R codes they are suspension codes and might have been set while the car was last in for service. What I do is clear the codes and then go for a drive and see what ones come back and then I will know which one to fix. If you drive too long several codes will set after the first one but the frist code is the only one that might need to be fixed. And most times it doesn't require replaceing the computor...it turns out to be a strut or sensor. Hope that makes sense.

    Try that and let me know if you need anymore help. Bill