Where is the starter relay on 02 Chevy trail blazer?

The starter relay on a 2002 Chevy Trailblazer isn't a standalone component like in some older vehicles. The starting system uses the Body Control Module (BCM) to control the starter solenoid via a signal wire. There isn't a separate relay in the traditional sense that you'd find and replace. Therefore, there's no single location to point to for a "starter relay."

Problems with starting are more likely to be related to:

* The BCM itself: A faulty BCM can prevent the signal to the starter solenoid.

* The starter solenoid: This is the part directly on the starter motor that engages the motor.

* The starter motor: The motor itself could be failing.

* Wiring: A break or short in the wiring between the BCM and the starter solenoid.

* Ignition switch: A faulty ignition switch could be preventing power from reaching the BCM or the starter solenoid.

* Neutral Safety Switch: If the vehicle doesn't believe the transmission is in park or neutral, it won't start.

If you're having starting issues, it's best to take it to a mechanic or use an automotive scanner to diagnose the problem rather than looking for a non-existent "starter relay." A scanner can read diagnostic trouble codes (DTCs) to pinpoint the actual cause.