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Vladgmru, Automotive Electrician
Category: Chevy
Satisfied Customers: 2668
Experience:  I've been working with American made cars since 1992.
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where is the starter relay located on a1998 chevy monte carlo

Resolved Question:

where is the starter relay located on a1998 chevy monte carlo 3.1 liter auto trans? I have voltage to the starter relay fuse in the start position but none to the solonoid wire. I can jump voltage to the solonoid &start the car.I don't have any dtc on pcm. Ken
Submitted: 5 years ago.
Category: Chevy
Expert:  Vladgmru replied 5 years ago.
HelloKen and welcome to JustAnswer.
My name is Vladimir.
Your model does not have a starter relay. There is a theft deterrent relay that may interrupt starter control circuit. The relay is controlled by the theft deterrent module and both of them are located behind the RH side of instrument panel.
The theft module monitors your ignition key pellet resistance when you insert the key into the lock cylinder and turn it ON. If it does not read proper value, it will not actuate the relay so you get no crank issue. It sounds like there is problem with this system.
Even if you bypass the relay and get your starter cranking, the engine won't start because the engine computer needs to get a signal from the theft module to pulse injectors.
The most common problem with these anti-theft systems is an ignition lock cylinder failure. There are two contacts inside the ignition lock cylinder that touch the key pellet when the key is inserted and two thin wires that come out of the lock cylinder and then go to the vehicle wiring harness . These two thin White wires are prone to brake in the area where they leave the lock cylinder.

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Customer: replied 5 years ago.
Vladimir I reicived your reply . This vehicle does start and run with key on by using my jumper switch on the solonid so i would think that the injectors were pulsing. I suspected a defective relay or an open circuit to it or from it to the solonid or possiblyaneutral safty switch . ken
Expert:  Vladgmru replied 5 years ago.
Hi Ken,
If it starts with a jumper to the solenoid terminal, then you are right it could be wiring or safety switch issue.
We should not guess , we need to check.
You will need a test light for quick and easy wiring checking .
Use the wiring diagram I provided above.
1) check for +12V out of the ignition switch ( Yellow wire) with the key in the start position.
2) If you have +12V on the yellow wire then check for +12 V on the Purple wire at the transmission range switch connector with the key in the start position. If there is no power on the purple = check 5A fuse.
3) If you get power to the purple wire, then check for power out of the transmission switch on the Yellow wire ( the switch must be connected, transmission is in PARK or NEUTRAL and key on START).
Let me know if you need more assistance.
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