
3
FIGURE 2a
Testing for Resistor Value, Passlock I
FIGURE 2b
Testing for Resistor Value, Passlock II
CUT
00.00
COM VΩ
ACV
Ω
OFF
DCV
1
2
3
The Passlock I
Key Cylinder
To Instrument
Panel Cluster
(IPC)
Test during
cranking.
Red/White
Orange/Black
Yellow
THREE 18 GA. WIRES
IN IGNITION WIRE
HARNESS
CUT
00.00
COM VΩ
ACV
Ω
OFF
DCV
1
2
3
The Passlock I
Key Cylinder
To Instrument
Panel Cluster
(IPC)
Test with the key
in the “run”
position.
White or Black/White
Black
Yellow or Black
THREE-WIRE RIBBON
CABLE
MAKING CONNECTIONS
TWO-WIRE PASSKEY SYSTEM
CUT
1
2
The Passkey
Cylinder
VATS
White or Purple
White or Purple
ALL WIRES ARE
22 AWG
BULLDOG
MODEL 721
Green
Blue
Yellow
THREE-WIRE PASSLOCK I AND PASSLOCK II SYSTEMS
CUT
1
2
3
To instrument
Panel Cluster
(IPC)
White or Red/White
Black or Orange/Black
Yellow (Black)
CUT
Green
Blue
Yellow
ALL WIRES ARE
20 AWG
BULLDOG
MODEL 721
WIRING DIAGRAM
WIRE CONNECTION GUIDE FOR PASSKEY
RED (+) • Constant Power Input: Connect to a fused source of constant 12V.
WHITE (-) • Negative Input: Connect to a wire from the remote start system which provides
(-) ground during ignition. (WHITE wire 16 awg on relay harness)
BLUE • Resister Relay Output #87: This wire will apply the selected resistor value to the Passkey
system. Connect this wire to (small WHITE or PURPLE 20 awg) wire in the vehicle.
GREEN • Resister Relay, normally closed #87a: Connect to the ignition switch side of the (small WHITE
or PURPLE 20 awg) wire in the vehicle.
YELLOW • Resistor Relay, common #30: Connect to the small (WHITE or PURPLE 20 awg) wire facing away
from the ignition switch in the vehicle. The ORANGE and PURPLE wires are not used.
WIRE CONNECTION GUIDE FOR PASSLOCK I
RED (+) • Constant Power Input: Connect to a fused source of constant 12V.
ORANGE (-) Connect to a wire on your remote start system that supplies a (-) ground only when cranking
(Bulldog 16 awg YELLOW WITH BLACK STRIPE wire on relay harness) wire from the remote start system
which provides (-) ground only while the vehicle is cranking.
PURPLE (-) • Output to Bulb Check Wire: Connect to the 20 ga. BLACK “bulb check” wire in the ignition
switch power harness. This wire will test (-) ground when the ignition switch is turned to the
“start” position.
PURPLE (-) Output to Bulb Check Relay #85
WHITE (-) Negative Input
ORANGE Starter Input
YELLOW Module Side
GREEN Key Side
BLUE Resistance Output
RED (+) Constant Power Input
BULLDOG
MODEL 721
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