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Body Integrated Unit

WARNING: This page is about a different car, the 2005 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Body Integrated Unit Terminals Specification
G03809378Courtesy of SUBARU OF AMERICA, INC.
BODY INTEGRATED UNIT TERMINALS SPECIFICATION

Content Terminal No. Measuring condition
Door switch (Except driver's door) b7 (INPUT) 0 V is present when any door is open (Except driver's door).
Door switch (Driver's door) b8 (INPUT) 0 V is present when driver's door is open.
Door lock switch b11 (INPUT) 0 V is present when the door lock switch is turned to UNLOCK.
Door lock switch b12 (INPUT) 0 V is present when the door lock switch is turned to LOCK.
Keyless entry control unit (LOCK) b13 (INPUT) Battery voltage is present when the transmitter LOCK/ARM button is pressed.
Keyless entry control unit (UNLOCK) b14 (INPUT) Battery voltage is present when the transmitter UNLOCK/DISARM button is pressed.
Ignition switch (ON) b19 (INPUT) Battery voltage is present when ignition switch is turned to ON.
Key warning switch b20 (INPUT) Battery voltage is present when the key is inserted into ignition switch.
Power supply a2 Battery voltage is constantly present.
Ground a4 0 V is constantly present.
Room light a5 (OUTPUT) 0 V is present when the transmitter UNLOCK/DISARM button is pressed.
Door and rear gate lock actuator a6 (OUTPUT) Battery voltage is present when the transmitter LOCK/ARM button is pressed.
Door and rear gate lock actuator (Except driver side) a7 (OUTPUT) Battery voltage is present when the transmitter UNLOCK/DISARM button is pressed two times.
Door lock actuator (Driver side) a8 (OUTPUT) Battery voltage is present when the transmitter UNLOCK/DISARM button is pressed one time.
Ground a13 0 V is constantly present.