Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
The Passlock™ module supplies power to the Passlock™ sensor on CKT 812.
When the Passlock™ sensor is powered and the ignition switch is rotated to the CRANK position, the hall effect security sensor will latch holding an internal code value. The Passlock™ module will compare this code to the value that the Passlock™ module measured in the last ignition cycle. If the latched value is the same as the last ignition cycle value, the test has passed. When the ignition switch is turned to the OFF position, the sensor is no longer powered and the sensor latch circuit resets.
In the next ignition cycle, the Passlock™ sensor waits for an ignition switch crank input. The Passlock™ sensor compares the ignition switch crank to the last recognized code. If the Passlock™ sensor power is shorted to ground, the sensor circuitry will not function and produce the required code.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.