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Keyless Entry Control Module

WARNING: This page is about a different car, the 2005 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Keyless Entry Control Module Terminals
G03752472Courtesy of SUBARU OF AMERICA, INC.
KEYLESS ENTRY CONTROL MODULE - ELECTRICAL SPECIFICATION

Content Terminal No. Measuring condition
Integrated module 1 (OUTPUT) 0 V is present when pressing the transmitter LOCK/ARM button.
Integrated module 2 (OUTPUT) 0 V is present when pressing the transmitter UNLOCK/DISARM button.
Security control module 3 -
Security control module 4 -
Door lock switch 5 (INPUT) 0 V is present when operating the door lock switch.
Ignition switch (ON) 6 (INPUT) Battery voltage is present when ignition switch is turned to ON.
Key warning switch 7 (INPUT) Battery voltage is present when inserting the key into the ignition switch.
Door unlock switch 8 (INPUT) 0 V is present when operating the door lock switch.
Trunk room light switch (Sedan), rear gate latch switch (Wagon) 9 (INPUT) 0 V is present when trunk lid or rear gate is open.
Door switch 10 (INPUT) 0 V is present when any door is open.
Ground 11 0 V is constantly present.
Turn signal light (Left) 12 (OUTPUT) Battery voltage is present when pressing the transmitter UNLOCK/DISARM or LOCK/ARM button.
Horn relay 13 (OUTPUT) 0 V is present when pressing the transmitter LOCK/ARM button three times within 5 seconds.
Power supply 14 Battery voltage is constantly present.
Power supply (Back-up) 15 Battery voltage is constantly present when back-up fuse is energized.
Keyless buzzer 16 (OUTPUT) 0 V is present when pressing the transmitter UNLOCK/DISARM or LOCK/ARM button.
Security control module 17 -
Turn signal light (Right) 18 (OUTPUT) Battery voltage is present when pressing the transmitter UNLOCK/DISARM or LOCK/ARM button.