LW2 V6-3.0L VIN R (2000)
Decklid/Liftgate Release
The trunk/liftgate release is controlled by the body control module (BCM) circuit 362 providing battery voltage to the release solenoid. The BCM limits
the amount of time the solenoid can be activated to 9 seconds to prevent damage to the solenoid. Reactivation may not be allowed for as much as 30
seconds.
Release of the decklid/liftgate can be initiated by either the transmitter or the decklid/liftgate release switch. Activating the decklid/liftgate release switch
provides battery voltage to circuit 56. Because remote keyless entry is an internal function of the BCM, no additional external wiring is necessary for
transmitter input to the BCM. Decklid/liftgate release is not allowed by the BCM when vehicle speed is detected. The BCM receives vehicle speed serial
data from the engine controller. Trunk release in sedan vehicles has a valet switch to limit trunk access.
The BCM also monitors the state of the decklid/liftgate. When circuit 744 is grounded by the ajar switch, the BCM will alert the driver the
decklid/liftgate is ajar by turning On the ajar telltale.
Keyless Entry Transmitter
The BCM will set DTC B3109 - Keyless Entry Transmitter Low Battery when the transmitter battery voltage is below 2.5 volts. Nominal battery
voltage is 3.0 volts.
Dome/Rear Reading Lamps
Dome and rear reading lamp operation is through the Body Control Module (BCM) providing ground to circuit 156. When manually operated by their
respective local switches, the dome and rear reading lamps are grounded through circuit 450 and the right body ground splice pack.
Battery Rundown Protection
Battery rundown protection (inadvertent power) is controlled by the BCM for all devices powered by circuit 1732. The devices include glove
compartment lamp, rear dome lamps, cargo lamp, map lamps, reading lamps, sunshade mirror lamps and courtesy lamps.
Should any device be On, the BCM will turn inadvertent power OFF after 20 minutes to conserve battery energy if there has not been an ignition
switch transition to RUN or START an RKE LOCK or UNLOCK, a decklid/liftgate operation or a driver/passenger door open/close. Inadvertent
power shutoff is disabled in ignition RUN or START
IMPORTANT: To prevent battery rundown on newly delivered vehicles, inadvertent power is limited to three minutes until vehicle mileage
exceeds 15 miles.
Doors and Locks
Circuit Chart
CIRCUIT CHART
Circuit assignments for the Body Control Module (BCM) relating to doors and locks:
DOOR LOCKING/UNLOCKING
Door locking/unlocking, by Remote Keyless Entry (RKE) or driver/all door lock switches, is controlled through the BCM.
When a driver door unlock has been requested, the BCM switches circuit 1391 to battery voltage. This energizes the driver door unlock relay which
supplies power to the driver door lock motor. Grounding is achieved through the closed contacts of the all-door lock relay. Grounding is also achieved
through the windings of the all-door lock motors and the all-door unlock relay.
When an all-door unlock has been requested, the BCM switches circuit 194 to battery voltage. This energizes the all-door unlock relay which supplies
