Hey guys my daily driver C5Z is acting up. Starting this week I started getting a service Column Lock error. I have also Noticed that when I turn the key off I do not hear the clicking from the bcm area of what I am guessing the LMC5 doing its work. I have also noticed that at the same time that when I go to start the car I can turn the key to start the starter will click like a bad solenoid. However before I let the key go you might hear another click or the starter engage. Seeing that the lmc5 says to look at the key switch I removed it from the car and put in a brand new ac delco unit. Bad news on that front as the new ignition switch would not crank the car over at all. Thank you made in china garbage. I took apart the old switch and the contacts were gross. I cleaned them up and put the old unit back in. I cleared the bcm and everything looked good. However on startup the starter clicked five times while holding the key in start. So I guess I will order another new switch while at work tomorrow. Thinking the switch could still be bad.

Anybody have their LMC5 Fail. The previous owner put the unit in. I saw it when I got power for my radio. Car still drives but I do not want to risk it dying on me so going to park the car till I figure this out.

Anything else I should look at it?

 

Check the LMC5 to see if the brown wire mod is done. May or may not help. Possibly swap the LMC5 for a new one, as the design has updated over the years. Really sounds like a low battery issue to me.

 

Might order a new module. It went in late 2017. Battery is a brand new AGM unit that went in January 22. 12.3 volts on the display after 1 hour of light on work in the car. I had got some error codes before when the old battery died.

 

If you get stuck, you can always furiously pound and jerk the steering wheel in frustration until if frees up. of course, not something a reasonable man would include in his travel plans, but good to know. if for no other reason that to explain why you are pounding on your stuck steering wheel like a mad man all of a sudden, just pretend it is a logical response.

 

A new LMC5 unit?... Mine has been in since 2003...😕 Do they ware-out?... How?

 

I have one,,,, pm me

 

Call Richard at Compliance Automotive.
I have talked to him numerous times on both the LMC5 and VATS bypass for my 99.
He is very helpful and knowledgeable.
He can likely help you troubleshoot.

http://www.complianceparts.com/contactus.html

 

Moved to C5 Tech.

 

I'd dump the LMC-5 for the old fashioned CLB

https://www.ebay.com/itm/11442726933...oAAOSwn25aGE~H

These are just WAY simpler, you never have to "call Richard" and never have to do the "brown wire mod."

 

How old is the battery? Very slight voltage drops cause lots of weird issues with these cars. A new battery has solved lots of issues for me with C5’s and C6’s over the years.

 

So went out today and played with some more. Fixed the new switch as it was not making contact. Still error codes. Figured it was not a switch problem. Decided to reset the bcm and pulled both bolts....well negative screwed out like normal. The positive fell out. Raided spare bolt I kept from junking a car a few months back and installed it. Well boom everything works. Starter clicking is gone, error messages are gone, starter is much stronger and my jumping voltage on the gauge has smoothed out to were it was when I bought the car. So seems it is fixed. All this over a one bad battery bolt.