Anti-Theft System: Operation

When mechanical key turns the PASSLOCK(R) lock cylinder, a Resistance Code (R-Code), is created by a rotating magnet turning past a stationary hall effect sensor. R-Code is sent to the TBC module. The module determines the validity of the R-Code within a preset time window, then send a coded password over the Class 2 serial data line to the Powertrain Control Module (PCM)/Vehicle Control Module (VCM), which then allows the fuel injectors to operate normally.

If TBC module sends a password that is different than learned password in PCM/VCM, PCM/VCM will go into NO START MODE. During this mode, the fuel injectors will be shut off for 10 minutes and SECURITY light will stay on. Vehicle may crank and temporarily start, but will soon stall due to fuel shut-off. If a large magnet is placed near PASSLOCK(R) sensor, a tamper signal will be sent to TBC. System is continually self diagnosing certain functions. If a malfunction exists, system will store a DTC. TBC does not illuminate MIL light. If a PASSLOCK(R) DTC exists, TBC illuminates SECURITY indicator light.