Type H: Negative (-) Multiplex - Viper 480XV Installation Manual

Type H: Negative (-) Multiplex

S S i i n n g g l l e e - - R R e e s s i i s s t t o o r r T T y y p p e e
If one resistor is used in the door lock switch/key cylinder, the wire will pulse ground in one
direction and resistance to ground when operated in the opposite direction.
T T w w o o - - R R e e s s i i s s t t o o r r T T y y p p e e
If two resistors are used in the factory door lock switch/key cylinder, the door lock switch/key
cylinder will read resistance to ground in both directions.
D D e e t t e e r r m m i i n n i i n n g g t t h h e e P P r r o o p p e e r r R R e e s s i i s s t t o o r r V V a a l l u u e e s s
To determine the resistor values, the door lock switch/key cylinder must be isolated from the factory
door lock system. For testing, use a calibrated digital multimeter that is set to ohms.
IMPORTANT! To ensure an accurate resistance reading, do not touch the resistor or
leads during testing.
1. Cut the output wire from the door lock switch/key cylinder in half.
2. Test with the meter from the switch side of the cut door lock switch/key cylinder wire to a
reliable ground source. Some good ground references are the ground input source to the door
lock switch/key cylinder or battery ground.
3. Operate the door lock switch/key cylinder in both directions to determine the resistor values.
If the multimeter displays zero resistance in one direction, no resistor is needed for that
direction.
4. Once the resistor value(s) is determined, refer to the diagram for proper wiring.
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