C5 Will Not Start-help
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Intermediate
Joined: Sep 2004
Posts: 34
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C5 Will Not Start-help
Came out to start my 1998 C5. Turned the ignition key-nothing-dashboard lights on gauges came on-starter motor did not work-no clicking from a solenoid or any sounds. Ten minutes later-tried to start the car-turned right over as nothing was wrong.
Bad ignition switch???????????? or something else???
Thanks for any help.
bruce@optonline.net
Bad ignition switch???????????? or something else???
Thanks for any help.
bruce@optonline.net
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I answered the same question for another forum member last night! 
I had a 98 coupe MN6. A few weeks out of warrenty my car did the same thing! I would turn the key 5-6 times and it would finially start. One day it stranded me (luckily I was home) and would not start!
There are two things that could also be giving you problems and I recommend that you take a look at them.
The first is the Theft Deterrant Relay. The BCM get inputs from the key security system (pellet in the key), The vehicle security system, and a few other things. Once the BCM has all of the proper inputs, it allows power to the Theft Deterrant relay which energizes and allows power to go to the starter.
The other componet in this circuit is the netural safety switch (on an automatic) OR clutch safety switch (on a manual vehicle)
My Theft deterrant relay had water in it from condenstaion from the AC system.
The Theft Deterrant Relay is located in the passengers foot well behind the toe board. You have to remove the toe board, them remove the carpeted knee bolster on the bottom of the dash. The relay is on the fire wall jst above the silver box (BCM)
I removed the plastic cover from the relay and found the relay componets inside was trashed!!!
If you need additional assistance i can dig DEEPER!!
Bill C
I had a 98 coupe MN6. A few weeks out of warrenty my car did the same thing! I would turn the key 5-6 times and it would finially start. One day it stranded me (luckily I was home) and would not start!
There are two things that could also be giving you problems and I recommend that you take a look at them.
The first is the Theft Deterrant Relay. The BCM get inputs from the key security system (pellet in the key), The vehicle security system, and a few other things. Once the BCM has all of the proper inputs, it allows power to the Theft Deterrant relay which energizes and allows power to go to the starter.
The other componet in this circuit is the netural safety switch (on an automatic) OR clutch safety switch (on a manual vehicle)
My Theft deterrant relay had water in it from condenstaion from the AC system.
The Theft Deterrant Relay is located in the passengers foot well behind the toe board. You have to remove the toe board, them remove the carpeted knee bolster on the bottom of the dash. The relay is on the fire wall jst above the silver box (BCM)
I removed the plastic cover from the relay and found the relay componets inside was trashed!!!
If you need additional assistance i can dig DEEPER!!
Bill C
