When a key is inserted into the ignition, contacts that
are 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. The module 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: |
| - | The module provides a ground for the starter enable relay at terminal A4
(CKT 625, YEL/BLK). The ground enables the starter to operate. |
| - | The module sends a proper pulse width modulated (PWM) signal to
the PCM. The signal travels via CKT 229 (DK BLU), terminal A3.
When the PCM receives this input, the PCM 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 3 minutes: |
| - | No ground is provided to the starter enable relay. The starter
is disabled. |
| - | No command is given to the PCM to enable the fuel delivery system. |
If you turn the ignition switch to the RUN position anytime during the
system disable interval, the PASS-Key® II theft deterrent module disregards
the key pellet value until the 3 minute system disable interval
is complete. This action occurs even if you use the correct key pellet
value.
After approximately 3 minutes, the PASS-Key® II theft deterrent
module performs the following actions:
| • | The module measures the key pellet resistance. |
| • | The module compares the key pellet resistance to a value stored
in memory. |
If the values match, the PASS-Key® II theft deterrent module performs
the system enable function. If the values do not match, the module performs
the system disable functions again.
If the PASS-Key® II theft deterrent module is unable to measure
the key pellet resistance due to a damaged or a missing pellet, the module
does not perform the system enable or system disable functions. The 3 minute
interval does not occur. A measurable key with the correct resistance value
can be used in order to start the vehicle.
Security Indicator Operation
When you turn the ignition switch to the RUN position, the SECURITY
indicator illuminates for approximately 5 seconds. The indicator notifies
the driver that the system operates correctly.
The PASS-Key® II system indicator operates in the following 4 modes:
| • | The indicator illuminates when you turn the ignition switch to
RUN (5 second bulb check). This shows that the indicator and the system
are operating correctly. |
| • | The indicator illuminates after the engine starts. This indicates
that one of the following conditions has occurred: |
| - | The PASS-Key® II theft deterrent module is not properly programmed.
You may use more than one key code value in order to start the vehicle. The
improperly programmed module condition usually occurs on a vehicle where
the module has been recently replaced. Refer to Programming the PASS-Key®
II Theft Deterrent Module. |
| - | The PASS-Key® II theft deterrent module detected a malfunction
in the PASS-Key® II system while the engine was running. Verify that the
following conditions are met. For further diagnosis, refer to
Content Theft Deterrent (CTD) System Check
: |
| • | The PASS-Key® II theft deterrent module connections are secure. |
| • | You are using a good ignition key. |
| • | The indicator illuminates, but the engine does not start. The
PASS-Key® II theft deterrent module has detected an incorrect key pellet
resistance key code value. The system disable functions activate. Perform
the following steps: |
| 1. | Remove the key from the ignition. |
| 2. | Verify that the correct key code (key pellet) is being used in
order to start the vehicle. Use a J 35628-A
interrogator in order to measure each key pellet for the
vehicle. All key codes should match. |
| 3. | Wait approximately 3 minutes for the system disable timer
to expire. Use a known good key with the correct key code and attempt to
restart the engine. |
| • | The indicator flashes and the engine does not start. The PASS-Key®
II theft deterrent module has detected an open or short in the ignition key
resistor input circuit. During this mode of operation, the PASS-Key®
II theft deterrent module does not start the system disable timer. Refer
to
Content Theft Deterrent (CTD) System Check
. |
