Ignition Key
The ignition key for vehicles which are equipped with the PASS-Key®
II system consists of the following components:
| • | A typical square ignition key blank |
The PASS-Key® II ignition key has the same mechanical key cuts as
a non-PASS-Key® II ignition key. You can not service the key blank and
the resistor pellet separately. There are 15 different ignition key assemblies,
each with a deferent key pallet resistance value.
Steering Column (Ignition) Lock Cylinder
The steering column (ignition) lock cylinder that is used with the PASS-Key®
II system contains a set of electrical terminals. The terminals are used in
order to contact the resistor in the ignition key.
The wire routing for the contacts inside the steering column is very
critical. When you service the lock cylinder, maintain proper wire routing.
When you replace a steering column lock cylinder, make new keys. The
new keys must match the following items:
| • | The PASS-Key® II code of the PASS-Key® II system |
| • | The mechanical cut of the new steering column (ignition) lock
cylinder |
Theft Deterrent Module
The theft deterrent module contains the software in order to perform
the following actions:
| • | Monitor the inputs for the PASS-Key® II system. |
| • | Control the outputs for the PASS-Key® II system. |
The following circuits are the theft deterrent module inputs:
| • | The battery voltage (CKT 1642, RED) input to the module
draws about 1 milliamp when the ignition is OFF. |
| • | The ignition voltage (CKT 1020, PNK) input (Buick) is used
in order to wake up the module. When you turn the ignition switch to the RUN
position, the module continuously measures the ignition key resistor. When
the ignition switch is in OFF, LOCK, or ACCY, the module does not measure
the ignition key resistor. |
| • | The ignition voltage (CKT 439, PNK) input (Oldsmobile)
is used to wake up the module. When you turn the ignition switch to the RUN
position, the module continuously measures the ignition key resistor. When
the ignition switch is in OFF, LOCK, or ACCY, the module does not measure
the ignition key resistor. |
| • | Ground (CKT 851, BLK/WHT) |
| • | The key resistor (CKT 1073, WHT/BLK) and the key resistor
ground (CKT 1074, PPL/WHT) inputs are used in order to determine if
you are using the correct key in order to start the vehicle. |
The following circuits are the theft deterrent module outputs:
| • | The theft deterrent relay (CKT 625, YEL/BLK) output controls
the theft deterrent relay. |
| • | The fuel enable (CKT 229, DK BLU) output commands the PCM
in order to enable the fuel delivery. When the theft deterrent module sees
the proper ignition key resistance, the module sends a pulse width modulated
(PWM) signal to the PCM. If the theft deterrent module does not see the
proper ignition key resistance, the module does not send a PWM signal to
the PCM. |
| • | The SECURITY indicator (CKT 264, DK GRN) output controls
the indicator that is located within the instrument cluster. |
Theft Deterrent Relay
The theft deterrent relay allows the engine to crank only when CKT 625
(YEL/BLK) is grounded by the theft deterrent module.
Powertrain Control Module (PCM)
The PCM monitors CKT 229 (DK BLU) in order to determine when
to enable the fuel delivery system.
The PCM has some diagnostic features associated with the PASS-Key®
II system. Some of the features are the diagnostic trouble codes.
