My C5 is not starting help!!!
Tech Contributor
Joined: Jan 2007
Posts: 19,475
Likes: 1,171
From: Dyer, IN
-IGN2 fuse
-CRK fuse
If this is true, then you have to check the park neutral position switch. You should have 12 volts with the key to start of the PNP purple wire terminal E. Have you checked that?
Melting Slicks
Joined: Sep 2008
Posts: 3,138
Likes: 802
From: Espanola New Mexico
I don't belive you have to get underneath the car, but rather remove the console to get access to the neutral safety switch. Before doing so have you checked for 12v at the TDR, using standard DVM leads you can insert them into the TDR socket across the yellow and yellow black strip wires. The Ignition switch should of course be held in the start position. If you see zero volts it may be because you don't have a ground on the yellow black stripped wire, there has to be a difference in potential when measuring voltage.
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Thread Starter
Heel & Toe
Joined: May 2025
Posts: 18
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So I just tried measuring the resistance of the ground wire the yellow and black wire from the TDR and I am not getting no readings like there is no ground or the ground is bad. Does this ground go to the BCM. I connected one prong of the multimeter to the yellow/black wire and the other one to another ground and I try to start it but no resistance on the meter is showing.
Last edited by RolyCorvetteC5; May 14, 2025 at 09:45 PM.
Instructor
Joined: May 2024
Posts: 155
Likes: 54
From: New Jersey, USA
I don't belive you have to get underneath the car, but rather remove the console to get access to the neutral safety switch. Before doing so have you checked for 12v at the TDR, using standard DVM leads you can insert them into the TDR socket across the yellow and yellow black strip wires. The Ignition switch should of course be held in the start position. If you see zero volts it may be because you don't have a ground on the yellow black stripped wire, there has to be a difference in potential when measuring voltage.
Tech Contributor
Joined: Jan 2007
Posts: 19,475
Likes: 1,171
From: Dyer, IN
Melting Slicks
Joined: Sep 2008
Posts: 3,138
Likes: 802
From: Espanola New Mexico
By jumpering C1 to C2 you are providing 12v directly to the TDR coil and completely bypassing the neutral safety switch. Somebody posted the starter wiring diagram do you know how to read a wiring diagram? In order for the TDR to energize you need 12v and ground across the relay coil, the yellow and yellow black strip wires. You might try placing a separate ground wire with the yellow black strip wire and try jumpering C1 to C2, if that doesn't work I would replace the TDR.
Tech Contributor
Joined: Jan 2007
Posts: 19,475
Likes: 1,171
From: Dyer, IN
How did you make the connection to C1 and C2. Be specific on "not starting". Does the engine crank?