View Single Post
Old 05-31-2015, 8:19pm   #22
Y2Kvert4me
Administrator
Barn Stall Owner #7
Barn Raising I,II,IV

NCM Supporter '13,'14
Points: 34,926, Level: 100
Activity: 0%
 
Y2Kvert4me's Avatar
 
Join Date: Oct 2009
Location: Pewaukee,WI
Posts: 8,215
Thanks: 1,044
Thanked 5,024 Times in 2,237 Posts
Gameroom Barn Bucks: $30682687
Default

Yes, that helps a lot, and that is most likely the problem.

It appears the ignition lock cylinder (GM part#12458190) contains the key pellet sensor, and electrical pigtail which connects to the BCM. It's about a $100 part and appears to be readily available.

I've never dug into this before, but since you seem to be good with electrical stuff, I believe you can bypass this sensor by unplugging that lock cyl connector (the one that contains just 2 white wires), and connecting a resistor of the same ohm value as your key pellet into the connector that leads to the BCM (leaving the switch pigtail disconnected). Might be worth trying before you drop $100+ on a new cylinder....If you have a Radio Shack or source for electronic resistors near you that is...


To measure your key pellet, just set your meter to ohms, and probe each side of the pellet in the key. There are 15 possible resistance values:

402 (ohms)
523
681
887
1.13k
1.47k
1.87k
2.37k
3.01k
3.74k
4.75k
6.04k
7.50k
9.53k
11.80k

You may need a combination of resistors in series to add up to the correct value needed to match your key. Solder the resistor(s) to some wires to create a jumper loop that plugs into the connector leading back to the BCM.
That should bypass it, and the car should then start and run. If it does, then you'll need to replace the ign lock cylinder to correctly fix it.

Y2Kvert4me is offline   Reply With Quote
The Following User Says Thank You to Y2Kvert4me For This Useful Post: