Autopage C3-RS-625 Installation Manual page 15

Important! This connection is a safety wire and must be connected
as shown and tested as specified. Failure to do so may result in
personal injury or property damage. See detail of wiring in the following
diagram. This wire may also be used if the vehicle brake light circuit
switches ground to the brake lights. An isolation diode must be used
for ground switched brake light circuits and must be connected to the
output of the brake switch.
WHITE/RED WIRE—Tachometer Signal connection—
This input provides the remote start system with information about the
engine's revolutions per minute (RPM). It can be connected to the
negative side of the coil in a vehicle with conventional coils. In multi-coil
and high energy ignition system locating a proper signal may be more
difficult. Once connected, you must Program the Start Feature D – 2 to
"Tachometer checking type" and teach the system the RPM signal. (See
Start Feature D – 2 Programming.)
To test for a tachometer wire, a multi-meter capable of testing AC
voltage must be used. The tachometer wire will show between 1V and
6V AC at idle, and will increase as engine RPM increases. In a
multi-coil ignition system, the system can learn individual coil wire.
Individual coil wires in a multi-coil ignition system will register lower
amounts of AC voltage. Also, if necessary, the system can use a fuel
injector control wire for engine speed sensing. Common locations for a
tachometer wire are the ignition coils itself, the back of the gauges,
engine computers, and automatic transmission computers.
IMPORTANT! Do not test tachometer w ires with a test light or logic
probe. The vehicle will be damaged.
How to find a tachometer wire with your multi-meter
1. Set the ACV or AC voltage (12V or 20V is fine.)
2. Attach the (-) probe of the meter to chassis ground.
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.
NOTE: No connection of this wire is required if you use the voltage or
timer checking type mode.
GRAY/BLACK WIRE: 200 mA (-) Second Starter Output.
This line can be used if a second starter line is needed. Some vehicles
require two starter line to remote start. This wire provides a negative
output that will work the same way as the Violet starter line in connector
H1
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