CAR ALARM AND REMOTE START INSTALLATION GUIDE
Copyrght 2002-2004 Triple S Customs 47
TESTING REVERSE POLARITY DOOR LOCKS
• Some models use a reverse polarity door lock system. Interfacing with a reversing polarity door lock
system requires two relays. It is critical to identify the proper wires and locate the master switch to
interface properly.
1. Locate a wire that shows 12V on lock and a wire that shows 12V on unlock.
2. Cut one of the suspect wires and check operation of the locks from both switches. If one switch loses
operation in both directions and the other switch operates in one direction only, you have located one of the
target wires.
3. The switch that lost all operation is the master switch.
4. If both switches still operate, but one door has stopped responding entirely, you have cut a motor lead.
Reconnect it and continue to test for another wire.
5. Once both wires have been located and the master switch identified, cut both wires and interface with two
relays as shown below:
WIRING RELAYS FOR REVERSE POLARITY DOOR LOCKS
Use relays to interface with a reverse polarity door lock system as shown:
NOTE: If not connected correctly, the system or factory switch may be damaged.
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