Code Alarm CA 521, Installation Instructions Manual

11

4.  TWO PIN DOOR LOCK/UNLOCK HARNESS, CONTINUED

Negative Lock Output  (GREEN)
Negative Unlock Output (BLUE)

The door lock / unlock outputs are designed to control several different types of systems which may require
additional parts.  Please review the wire and location chart to see which type of door lock system is in your
vehicle.  The most common types are shown in the diagrams below.

One wire Positive / Negative Multiplexed (resistor based system)

Locate the lock / unlock wire at the vehicle’s lock / unlock switch.

Verification: This wire will show variable positive voltage or ground when the switch is activated.  Please
consult the wire and location chart for specific resistor values and polarity for your vehicle.

Connect the GREEN and BLUE wires shown in the diagram below.  Use Code Alarm part HDRLY (an SPDT
relay, not included).

Aftermarket door lock / unlock actuators (not supplied use Code Alarm part # DA1 ):

Connect the GREEN and BLUE wires shown in the diagram below.  Use Code Alarm part HDRLY (an SPDT
relay, not included).

30

87

87a

86

85

Fused +12 Volt
Battery Source

Lock

Unlock

      Door 
Lock Switch

30

87

87a

86

85

    GREEN (-) Lock Output

    BLUE (-) Unlock Output

Fused +12 Volt Battery Source 
 For Positive Polarity Systems
                    Or
         Chassis Ground For 
    Negative Polarity Systems

 Resistor

 Resistor

Vehicle Door Lock
    Control Relays

30

87

87a

86

85

Fused +12 Volt
Battery Source

Door Lock
 Actuator

30

87

87a

86

85

Chassis
Ground

Chassis
Ground

    GREEN (-) Lock Output

    BLUE (-) Unlock Output

Fused +12 Volt
Battery Source

M