Firstech CM900AS User Manual

Alarmand StarterSystem
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CM900 Master Guide
Copyright 2018 Firstech,
LLC.
Page 13
Numberof
Parking Light
Flashes
T ach Error
1
Option 2-10 is not in Tach setting
2
Key is in the off position
3
Bad tach signal. Find a different wire.
Tach Sensing
The default engine sensing mode is tachless (voltage sense). In cold weather climates we recommend using
Tach sense for more reliable and consistent starting. The CM900 can be switched to tach mode automatically
by performing the following steps. Firstech recommends using a digital multimeter when testing for tach.
STEP 1: Test wire and make connection. At idle, the tach wire should test between 1 to 4 Volts AC.
As the vehicle RPM’s increase the voltage on the meter will also increase. Always make a wire to
wire connection for tach when hardwiring.
STEP 2: Start the vehicle with the key. Allow time for the engine to idle down. (If you do not want to wait
for the vehicle to idle down, you can shift the vehicle into reverse while holding your foot on the
brake.).
STEP 3: Learn tach: Activate
the remote start sequence by
holding the Start Button for 3
seconds. The parking lights will
flash once, and the siren will
chirp once to confirm a good
tach signal. If the parking lights
flash 2 times and the sirens
chirps twice, this
would indicate the tach did not learn. A few seconds after the 2 flashes, the CM900 will flash
parking lights to indicate the tach learn error.
“EZ TACH” programming procedure (only available when set to tach mode feature 2-10 option 12)
STEP 1: Hold the foot brake (must be held down before vehicle is on)
STEP 2: Start the vehicle (with foot brake still held down)
STEP 3: Wait 30 seconds (with foot brake still held down) for the CM to capture the engine running
tach signal. The CM will flash the parking lights 1 time after 30 seconds to indicate it has
captured a good tach or engine running signal. If there is no or poor signal the CM will flash
the standard tach programming diagnostics as shown above.
STEP 4: Programming complete (This procedure will be disabled after the first time but can be enabled with
a main control module power cycle)
Alternator Sensing
Alternator sensing is another method the remote start can utilize to determine if the engine is running. This is
different than the tachless mode and a wire to wire connection must be made.
STEP 1: Change Option 2-10 to setting 3 - Alternator sensing.

Firstech CM900AS Specifications

General

Brand	Firstech
Model	CM900AS
Category	Remote Starter
Language	English