How do I find the starter rely on my 2002 astro van?

Horn relay is under the hood in the electric center , first check fuse behind left foot kick panel then the relay and last the switch in steering column

GM uses a direct connection to the starter solenoid from the ignition switch/cluster switch. There is no starter relay.

check for bad connection at the caliper

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Underneath where the motor and trans.meet.

Either the battery is on its way out and is not holding a charge or the battery cable terminals are not clean, not tight or are corroded causing a bad connection. This is the best case scenario, worst case would be the starter itself.

the starter is eazyist to get to be removing the driver's side front tire so u can access the wireing, the rest will be doen from under the van a hoist is perferable but it can be doen in your drive way with the factory jack

Check the fuse links down by the starter.

Check and clean all connections to the battery. Check all electrical connects at starter also.

sir change solenoid