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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Did the vehicle start fine prior to the tuneup?
You mentioned checking the start relay then you mentioned the starter comes on. I need to confirm it will crank?
Thanks so you have 2 issues now. A no crank and a no start.
At the removed starter relay are there 2 pins with battery voltage when trying to start?
With the key on, is the theft light off?
You will need to hold the key in the start position to check the starter relay.
The theft light is in the instrument cluster.
The theft light should go off when the key is on meaning the key code is valid. This will allow the computer to ground the starter relay and allow the engine to crank and start. Have you tried your spare key? Does your vehicle have an aftermarket alarm or remote start?
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