From 1986 Pontiac Service Manual,
Voltage is applied at all times through the CTSY/LID fuse to the trunk release switch. With the switch closed, voltage is applied through the trunk release switch to the trunk release relay coil and contact.
When the parking brake is applied, the parking brake switch closes, and provides ground for the relay coil. Voltage is applied from the CTSY/LID fuse to the trunk release switch. Voltage is then applied to the trunk release relay. The relay operates and voltage is applied from the closed relay contact to the trunk release solenoid, releasing the lock.
Voltage is applied from the closed trunk release switch through the release relay coil to the gear selector switch. With the ingition switch not in start and the gear selector switch in park or neutral, the starter solenoid provides ground for the relay. The relay contacts close and voltage is applied to the trunk release solenoid, releasing the lock.
AUTO TRANS
I
I Yellow/Black (from switch)
___I_________________________
I I
I Trunk Release Relay I
I I
I___________________________I
I I
I Black/White I Yellow
I to trunk I
I Solenoid I
I _____I___________
I I Gear I
I I Selector I
I I Switch I
I I_______________I
I I
I I Purple
I I to starter
I I solenoid
MANUAL TRANS
I
I Yellow/Black (from switch)
___I_________________________
I I
I Trunk Release Relay I
I I
I___________________________I
I I
I Black/White I Tan/white
I to trunk I
I Solenoid I
I _____I_____
I I I
I I Diode I
I I__________I
I I
I ITan/white
I __I__
I I
I I Purple
I ____ I_____
I I Parking I
I I Brake I
I I Switch I
I__________I
From: Scott Backer