Tach Threshold On/Off - Directed Electronics 554A Installation Manual

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NOTE: For parking light circuits that draw 10 amps or more, the jumper must be switched to a (-)

light flash output. P/N 8617 or a standard automotive SPDT relay must be used on the H1/2 light

flash output harness wire.

IMPORTANT! DO NOT connect the H1/2 light flash wire to a negative vehicle light

flash wire before changing the programming jumper to the negative polarity position or

damage to vehicle light circuit may occur.

Tach Threshold On/Off

In most cases, this jumper can be left in the OFF position. Some new vehicles use less than 12 volts

in their ignition systems. The unit may have trouble learning the tach signal in these vehicles.

Changing the jumper to the ON setting changes the trigger threshold of the digital tach circuit so it

will work properly with these vehicles. The vehicles affected include many newer

Dodge/Chrysler/Plymouth vehicles, such as the Neon, Cirrus, Stratus, Breeze and LH-based vehicles.

System Features Learn Routine

The System Features Learn Routine dictates how the unit operates. Due to the number of steps,

they have been broken up into three menus. It is possible to access and change any of the feature

settings using the integrated LED/Valet

using the 998T Bitwriter

. Any of the settings can be changed and then assigned to a particular

transmitter, up to four, a feature called Owner Recognition. Each time that particular transmitter is

used to disarm the system, the assigned feature settings will be recalled. Owner Recognition is only

possible when programming the unit via the 998T Bitwriter

If the system was previously programmed using the 998T Bitwriter

locked. If the siren generates one long chirp when attempting to program the unit, the learn routine

is locked and must be unlocked using the 998T Bitwriter

1. O O p p e e n n a a d d o o o o r r . . (The H1/5 GREEN wire or the H1/7 VIOLET wire must be

connected.)

2. I I g g n n i i t t i i o o n n . . Turn the ignition on, then back off: (The heavy gauge PINK wire of

the relay satellite must be connected.)

2003

Directed Electronics, Inc.

switch. However, this process can be greatly simplified by

, the learn routine may be

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