K Yukon/Denali 4WD V8-5.7L VIN R (2000)
Lock Cylinder Switch: Description and Operation
The passlock (TM) sensor is inside the upper right side of the steering column. The passlock (TM) sensor contains 2 hall effect sensors. The tamper hall
effect sensor is on the top. The security hall effect sensor is under the tamper hall effect sensor. Both of the hall effect sensors monitor the magnet of the
lock cylinder through an opening. The tamper hall effect sensor is physically placed on top of the security hall effect sensor. The placement enables the
tamper hall effect sensor to engage first if an intruder attempts to bypass the passlock (TM) sensor by placing a large magnet around that area of the
steering column. There is a tamper resistor inside the passlock (TM) sensor in order to help prevent tamper to the system. Passlock (TM) equipped
vehicles have a selection of 10 different security resistors ranging up to 13K ohms. Install any of the security resistors inside the passlock (TM) sensor in
order to generate a unique passlock (TM) code. All 10 combinations of the passlock (TM) sensor have the same part number. However, you cannot
simply replace the passlock (TM) sensor and expect the system to operate properly. Always start by performing the Diagnostic System Check first and
following the instructions.