Insert the ignition key into the ignition cylinder. The
wire coils surrounding the ignition cylinder energizes a transponder pellet
located within the plastic portion of the ignition key. The energized transponder
transmits a unique value by radio frequency back to the coils which are
part of the PASS-Key® III module. When the PASS-Key® III
module detects the ignition voltage (the ignition switch is in RUN or START)
at terminal E (CKT 1020, PNK) the module measures the transponder
pellet value being received by the coils. The PASS-Key® III
module validates this value and performs the following functions:
| • | If the value is valid, the PASS-Key® III module performs
the following (system enable) functions: |
| - | The module sends a class 2 system enable message (a unique
password) to the PCM. |
| - | The PCM enables the fuel system. |
| - | The PCM provides a ground for the starter relays. |
| - | This function enables the engine to start. |
| • | If the value is invalid, the PASS-Key® performs the following
(system disable) functions for approximately 3 minutes: |
| - | The module sends a class 2 system disable message (a unique
password) to the PCM. |
| - | The PCM does not enable the fuel system. |
| - | The PCM does not provide a ground for the starter enable relays. |
| - | This function does not enable the engine to start for approximately
3 minutes. |
This password is unique for each PASS-Key® III module, thus
preventing a thief from swapping one of the following items in order to start
the vehicle:
| • | The PASS-Key® III module |
If the PCM receives an invalid password indicating a swapped PASS-Key®
III module or PCM, the following systems are not enabled:
If you turn the ignition switch to the RUN position at anytime during
the system disable interval, the PASS-Key® III module disregards
the transponder value until the 3 minute system disable interval
is complete (even if an ignition key using a valid transponder is used).
When the system disable interval expires, the PASS-Key® III
module measures the ignition key transponder value when the ignition switch
is turned to the RUN position.
If the PASS-Key® III module is unable to measure the ignition
key transponder value (due to a damaged or missing pellet), the PASS-Key® III
module performs the system disable functions. The module does not activate
the 3 minute system disable interval. An ignition key using a valid
transponder value may be used in order to start the vehicle.
The Ignition Key (Transponder)
The ignition key for PASS-Key® III equipped vehicles is a
typical ignition key using a transponder pellet located in the plastic end
of the key. This vehicle has the following 2 types of ignition keys:
| • | The master key (black plastic end) may perform the following functions: |
| - | Lock/unlock all of the door locks. |
| - | Lock/unlock all of the storage compartments. |
| - | Lock/unlock the rear compartment lid lock. |
| - | Lock/unlock the rear compartment valet lock out switch, which
is located on the IP. |
| • | The valet key (gray plastic end) may perform the following functions: |
| - | Lock/unlock all of the door locks. |
| • | The valet key cannot perform the following functions: |
| - | Lock/unlock all of the storage compartments. |
| - | Lock/unlock the rear compartment lid lock. |
| - | Lock/unlock the rear compartment valet lock out switch, which
is located on the IP. |
The ignition key transponder value determines if a valid ignition key
is being used in order to start the vehicle. There are approximately 3 trillion
different transponder values available. The transponder values may meet
the following conditions:
| • | Unable to service separately |
Steering Column Ignition Lock Cylinder
The ignition lock cylinder is located within the PASS-Key® III
module. The lock cylinder may lock separately. The ignition lock cylinder
also performs all of the functions of a non-PASS-Key® III vehicle.
When replacing the ignition lock cylinder, refer to PASS-Key® III
System Auto Learn Procedure.
PASS-Key® III Module
The PASS-Key® III module is located within the steering column.
The PASS-Key® III module inputs and outputs are the following types:
| • | Battery voltage (CKT 40, ORN) |
| • | Ignition voltage (CKT 1020, PNK) |
| • | G202 (CKT 351, BLK/WHT) |
| • | The class 2 serial data line (CKT 1807, PPL) |
Powertrain Control Module (PCM)
The PCM verifies that the following system passwords received by the
PASS-Key® III module via the class 2 serial data line are
valid:
The PCM disables the fuel and starter systems if any of the following
conditions occur:
| • | The passwords are invalid. |
| • | The system disable password is valid. |
| • | No passwords are received. |
If the system enable password is valid, the following conditions may
occur:
| • | The PCM enables the fuel system. |
| • | The PCM grounds the starter relays. |
