With key on, do the warning lights and gauges come on? If yes, next is to check the start wire from ignition switch to the starter solenoid. The only time this wire has power is when the key is held in start. One could pull off the small wire at the starter solenoid on the starter, and check if it has power with the key held in start. If it does have power, may be a problem with the starter solenoid. But if no power on that wire, you will have to trace the wire from switch to starter. Not a direct path to the starter though. There is a park/neutral safety switch that the wire has to pass power through, so in park or neutral you would have power in and power out of the switch. If you have a manual transmission, substitute a clutch safety switch (or clutch inter-lock switch) for the park/neutral switch. If you have this, easy to check for power in/power out of the switch, with clutch pedal depressed and key held in start.
There is also likely a starter relay in the circuit. If you can find it and if you have a test light or voltmeter, you can do some checking here to see if your start wire still has power. Pull the relay out, key off. See if any terminals the relay plugs into has power. May or may not, depending on how the wiring is set up for the relay. But now if you hold key in start and check all the terminals, there should be at least one (maybe two) terminals that have power, where they didn't have before. That tells you the power is still getting out to this point.
If you have a theft deterrent system, and it is activated, at this relay is where it may come into play-not letting power pass through to the starter solenoid on the starter.
Sorry I do not have a wiring diagram so could give you more specifics. Hope you kind of get the picture, though. Large maxifuses pass power to the ignition switch. The switch sends the power out as demanded. The start wire out of the switch going through the start circuit to the starter solenoid only has power when the key is held in start.
SOURCE: 2005 Saturn Vue - Starting Problems
make sure to check your fuses and ground wires first. when you are set on which part is bad do a quick check of everything else before you jump into it.
SOURCE: 2006 Jeep Wrangler won't start
First, make sure you can turn the engine by hand. If you can't then the starter can't turn it either. Have someone else turn the key and look for the source of the click...may be a relay. Go over the starting circuit with a volt meter. Check for power at the starter main terminal and then with the key turned to "start" check for power at the trigger terminal on the starter. Check battery voltage and check relay operation.
You have a neutral safety switch on the transmission if its an automatic and a clutch switch if it's a stick. Check them as well. Make sure battery grounding on fender and block are also clean and secure.
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SOURCE: 2006 saturn ion door locks and trunk pop wont work....
The remote won't ework because the problem is in the vehicle. Just for test purposes and possible remedy. Remove and clean the negative battery cable. Ensure a clean , tight connection. Then find the body ground. Yhis ground is locted usually at the top rear of the engine. .I's a snall stainless steel strap bolted to the engine and fire wall, This must olsobe clean with a good contack. Might as well clean the + cable and connection on the battery while you are there. Good luck and keep me posted olease. Good Luck, Ned_
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SOURCE: STARTER WONT ENGAGE ONLY CLICKS UNDER HOOD STATER
If the clicking sound is coming from the engine bay, from the relay, you may want to have the starter itself checked out. You need to check if the ground cable from the engine to the chassis is secured. If that is OK, you may want to have the starter motor checked.
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