General Information

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(R) 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(R) II theft deterrent module, then performs one of the following functions:

^ If the values match, the PASS-Key(R) 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 A .When the PCM receives this input, it enables the fuel delivery system.

^ If the values do not match, the PASS-Key(R) II theft deterrent module performs the following (system disable) functions for approximately 3 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(R) 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 3 minutes, the PASS-Key(R) 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(R) II theft deterrent module performs the system enable function (see above). If the values do not match, the PASS-Key(R) II theft deterrent module performs the system disable functions again.

If the PASS-Key(R) II theft deterrent module is unable to measure the key pellet resistance (due to a damaged or missing pellet), the PASS-Key(R) 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).