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Directed Electronics, Inc.
3. Start and run the vehicle.
4. Probe the wire you suspect of being the tachometer wire with the red probe of the meter.
5. If this is the correct wire the meter will read between 1V and 6V. Increase the R.P.M., and the
voltage should increase approximately 1V.
Finding the WAIT-TO-START Bulb Wire for Diesels
In diesel vehicles it is necessary to interface with the wire that turns on the WAIT TO START light
in the dashboard. This wire illuminates the bulb until the vehicle’s glow plugs are properly heated.
When the light goes out the vehicle can be started. This wire is always available at the connector
leading to the bulb in the dashboard. It can also be found at the Engine Control Module (ECM)
in many vehicles. However, there are some instances of diesel vehicles without WAIT TO START
wires. In this case, please contact Technical Support.
To test and determine the polarity of this wire:
1. Set your multimeter to DCV or DC voltage (12 or 20V is fine).
2. Attach the (+) probe of the meter to (+)12V.
3. Probe the wire that you suspect leads to the bulb with the (-) probe of the meter.
4. Turn the ignition switch to the ON position.
5. If the meter indicates 12 volts until the light goes out you have isolated the correct wire and the
wire's polarity is negative (ground while the bulb is on).
6. If the meter reads zero volts until the light goes out and then reads 12 volts, you have isolated
the correct wire and the wire's polarity is positive.
After the Installation
➤
Test all functions. The Using Your System section of the Owner's Guide is very helpful when
testing.
➤
Review and complete the Safety Check section of this guide prior to the vehicle reassembly.
Vehicle Anti-Theft Systems (Immobilizers)
Vehicle anti-theft systems (immobilizers) require a bypass module. The bypass module allows for
easy interfacing, while still maintaining the OEM security system’s integrity. For vehicle listings and
required bypass, see DirectFax Document 1059, available only to authorized dealers through the
technical resources listed at the front of this guide.