General

When a key is inserted in the ignition, contacts located in the steering column (ignition) lock cylinder contact a resistor pellet located in the ignition key. The PASS-Key� II theft deterrent module measures the resistance of the key pellet and then compares this value to a value stored in memory. The PASS-Key� II theft deterrent module, then performs one of the following functions:
^ If the values match, the PASS-Key� II theft deterrent module performs the following (system enable) functions:
- Provides a ground for the starter enable relay at terminal A4 (CKT 625, YEL/BLK), thus enabling the starter to operate.
- Sends a proper pulse width modulated (PWM) signal to the PCM, via circuit 229 (DK BLU), terminal A3. When the PCM receives this input, it enables the fuel delivery system.
^ If the values do not match, the PASS-Key� II theft deterrent module performs the following (system disable) functions for approximately three minutes:
- No ground provided to the starter enable relay, disabling the starter.
- No command to the PCM to enable the fuel delivery system.

If the ignition switch is turned to the RUN position anytime during the system disable interval, the PASS-Key� II theft deterrent module disregards the key pellet value until the three minute system disable interval is complete (even if the correct key pellet value was used).

After approximately three minutes, the PASS-Key� II theft deterrent module measures the key pellet resistance and compares it to a value stored in memory. If the values match, the PASS-Key� II theft deterrent module performs the system enable function (see above). If the values do not match, the PASS-Key� II theft deterrent module performs the system disable functions again (see above).

If the PASS-Key� II theft deterrent module is unable to measure the key pellet resistance (due to a damaged or missing pellet), the PASS-Key� II theft deterrent module does not perform the system enable or disable functions (no three minute interval is performed, a measurable key with the correct resistance value can be used to start the vehicle).