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Do you know how to test automotive electrical circuits ? Do you know what a electrical wiring diagram is. Have a DVOM - digital volt ohm meter ? How about a automotive relay , do you know what it is an how it works ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model ,engine . Under system click on engine , then under subsystem click on starting. Click the search button ,then the blue link . You will see all the componets involved in starting the vehicle. ignition switch , starter range switch , starter relay , PCM -powertrain control module . When you turn the ignition switch to the start position it sends a voltage signal to the PCM , this tells the PCM start is requested , in turn the PCM energize's the starter relay . This will close contacts inside the relay allowing B+ voltage at pin 30 of the relay to go to the starter solenoid . engaging the starter . Checking fuse's an power an ground , testing relay control . . Videos on youtube for electrical testing. Electric Testing Techniques You Need to Know Relays Understanding Diagnosis and Testing Relayed Circuits Pt1
Didn't see main relay, did see, eec power relay.
Hopefully, it is under hood, driver side, wheel well lining in relay pack. If several relays and you don't know which one, look at the wiring diagram for eec power relay, Match the wire colors with relay. If you can't read it, bbbind.com has free wiring diagrams, so does autozone.com.
park relay may be shorted. find relay in engine compartment relay box. Pull relay out--lights should go out. Put back in, does relay click? If no and lights come on again, replace relay.
If relay clicks, suspect your headlight switch is shorted. let me know if you have questions.