The interlock solenoid is provide with power by the Transmission control module (tcm) when the brake pedal is applied and then grounded by the gear selector switch in park. If you access the connector to the tcm, you can check to see if it's getting a ground signal and check the solenoid. Pull the harness connector off the tcm and apply 12v to the harness connector pin that leads to the white wire with a green stripe as seen in the diagram. If the solenoid clicks, you may have a bad tcm. If the solenoid does not click, you may have a bad solenoid, or bad selector switch. The tcm is under the front passenger footwell.
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