TECHNICAL ASSISTANCE
Should you need help. First check our website at www.bulldogsecurity.com/wires.htm or call our toll-free
Tech Support Hotline Monday through Friday 9AM-8PM and Saturday 10AM-4PM EST at 800-878-8007.
You must give the following information:
•Name
•Telephone Number with Area Code (Fax number if applicable)
•Year, Make, and Model of the vehicle
•The model number of the system you are installing
•The type of assistance you are requesting
If you give the above information you will be called back as soon as possible, usually within 10 minutes.
1
PASSLOCK HISTORY
The Bulldog Model 721 interface module is used when installing remote start products in GM vehicles
equipped with he PASSKEY, PASSLOCK I and PASSLOCK II anti-theft system. This model allows easy
interfacing while maintaining the OEM system’s integrity. The Model 721, when installing with the
passlock I system will provide a ground to the “bulb check” wire, immediately after the vehicle starts,
it will provide the proper resistor code (R-Code) to the instrument panel cluster (IPC). The Model
721 has no affect on the Passkey or Passlock system when the remote start is not in use. The factory
Passlock anti-theft system remains fully functional.
The GM Passlock system is a key-based, fuel shutdown, anti-theft system. The system requires that
the key cylinder be mechanically turned using a key. When the key cylinder is properly turned, it
generates the R-Code, which is sent to the IPC. The IPC, which houses the Passlock decoder, then
interprets the signal. Unlike the Passkey system, Passlock must see the correct resistance code at
the correct time. When the ignition switch is turned to the CRANK position, the “bulb check” wire
is switched to ground. This starts a time window during which the IPC analyzes the R-Code. If the
R-Code is valid and received in the proper window of time, the IPC sends a code via data bus to the
power train control module (PCM) to enable the fuel system. The vehicle will then start and stay
running. If the R-Code is incorrect, the vehicle will start and run for a moment and then shut off.
PASSKEY INSTALLATION
NOTE: Never connect the wiring on the Passkey or Passlock system without first setting the dipswitch
positions. Installing the unit with all dipswitches in the down or (0) position could cause damage
in your vehicle and/or Passkey or Passlock system.
1. Locate the 2 wire harness in the steering column coming from the ignition switch cylinder. This
harness should contain 2 WHITE wires or 1 WHITE or 1 PURPLE wire.
2. To measure resistance on the passkey pillet on the key, see figure 1.
3. Cut the WHITE or PURPLE wire in half.
4. Strip back the other WHITE or PURPLE wire to expose the copper for a connection.
5. Look up the value read from the meter on the chart and set the switches remembering a (1) on the
chart indicates a switch in the “up” position.
6. Attach the GREEN wire to the key cylinder end of the cut WHITE or purple wire.
7. Attach the YELLOW wire to the remaining end of the cut WHITE or PURPLE wire.
8. Attach the BLUE wire to the stripped back WHITE or PURPLE wire.
9. Attach the RED wire to a fused constant 12V wire fused at 10 Amps.
10.The ORANGE wire and PURPLE wire are not used.
11.Connect the WHITE wire to the (-) WHITE 16awg on the remote starters relay pack.
12.Set switch 11 to the “on” or “down” position and 12 to the “off” or “up” position.
For testing resistor value on Passkey systems, see figure 1.
(11 pages)
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