Power Locks: Description and Operation

POWER DOOR LOCK SYSTEM

System Description
Power is supplied at all times
- through 50 A fusible link (letter g, located in the fuse and fusible link box)
- to BCM (body control module) terminal 70 and
- through 10 A fuse (No. 25, located in the fuse and fusible link box)
- to key switch terminal 2
- through 10 A fuse [No. 18, located in the fuse block (J/B)]
- to BCM terminal 57.

Ground is supplied to terminal 67 of BCM through body grounds M57, M61 and M79.

INPUT
With the key in the ignition key cylinder, power is supplied
- through key switch terminal 1
- to BCM terminal 37.

With front door LH open, ground is supplied
- to BCM terminal 47
- through front door switch LH terminal 2
- through front door switch LH case ground.

With front door RH open, ground is supplied
- to BCM terminal 12
- through front door switch RH terminal 2
- through front door switch RH case ground.

With rear door LH open, ground is supplied
- to BCM terminal 48
- through rear door switch LH terminal 2
- through rear door switch LH case ground.

With rear door RH open, ground is supplied
- to BCM terminal 13
- through rear door switch RH terminal 2
- through rear door switch RH case ground.

With back door open, ground is supplied
- to BCM terminal 43
- through back door switch terminal 3
- through back door switch terminal 1
- through body grounds D406 and D652.

With the key inserted in the key cylinder LH and turned to LOCK, ground is supplied
- to BCM terminal 8
- through front door lock assembly LH (key cylinder switch) terminal 5
- through front door lock assembly LH (key cylinder switch) terminal 4
- through body grounds M57, M61 and M79.

With the key inserted in the key cylinder LH and turned to UNLOCK, ground is supplied
- to BCM terminal 7
- through front door lock assembly LH (key cylinder switch) terminal 3
- through front door lock assembly (key cylinder switch) LH terminal 4
- through body grounds M57, M61 and M79.

With the key inserted in the back door key cylinder and turned to LOCK, ground is supplied
- to BCM terminal 8
- through back door key cylinder switch terminal 1
- through back door key cylinder switch terminal 2
- through body grounds D406 and D652.

With the key inserted in the back door key cylinder and turned to UNLOCK, ground is supplied
- to BCM terminal 7
- through back door key cylinder switch terminal 3
- through back door key cylinder switch terminal 2
- through body grounds D406 and D652.

With the main power window and door lock/unlock switch pressed to LOCK, ground is supplied
- to BCM terminal 45
- through main power window and door lock/unlock switch terminal 10
- through main power window and door lock/unlock switch terminal 14
- through body grounds M57, M61 and M79.

With the power window and door lock/unlock switch RH pressed to LOCK, ground is supplied
- to BCM terminal 45
- through power window and door lock/unlock switch RH terminal 1
- through power window and door lock/unlock switch RH terminal 3
- through body grounds M57, M61 and M79.

With the main power window and door lock/unlock switch pressed to UNLOCK, ground is supplied
- to BCM terminal 46
- through main power window and door lock/unlock switch terminal 11
- through main power window and door lock/unlock switch terminal 14
- through body grounds M57, M61 and M79.

With the power window and door lock/unlock switch RH pressed to UNLOCK, ground is supplied
- to BCM terminal 46
- through power window and door lock/unlock switch RH terminal 2
- through power window and door lock/unlock switch RH terminal 3
- through body grounds M57, M61 and M79.

OUTPUT

Unlock
Ground is supplied
- to front door lock assembly LH (actuator) terminal 1, front door lock actuator RH terminal 2, rear door lock actuator LH and RH terminal 2 and back door lock actuator terminal 2
- through BCM terminal 65.

FRONT DOOR LH
Power is supplied
- to front door lock assembly LH (actuator) terminal 2 and
- through BCM terminal 59.

FRONT DOOR RH
Power is supplied
- to front door lock actuator RH terminal 1
- through BCM terminal 66.

REAR DOOR LH AND RH
Power is supplied
- to rear door lock actuator LH and RH terminal 1
- through BCM terminal 66.

BACK DOOR
Power is supplied
- to back door lock actuator terminal 4
- through BCM terminal 66.

With power and ground applied as described, the doors are unlocked.

Lock
Ground is supplied
- to front door lock assembly LH (actuator) terminal 2
- through BCM terminal 59 and
- to front door lock actuator RH terminal 1, rear door lock actuator LH and RH terminal 1 and back door lock actuator terminal 4
- through BCM terminal 66.

Power is supplied
- to front door lock assembly LH (actuator) terminal 1
- front door lock actuator RH terminal 2
- rear door lock actuator LH and RH terminal 2
- back door lock actuator terminal 2
- through BCM terminal 65.

With power and ground applied as described, the doors are locked.

OPERATION
- The main power window and door lock/unlock switch on front door LH trim and door lock/unlock switch RH on front door RH trim can lock and unlock all doors.
- With the key inserted in the front door key cylinder LH or back door key cylinder, turning it to LOCK locks all doors; turning it to UNLOCK once unlocks the front door LH; turning it to UNLOCK again within 5 seconds of the first unlock operation unlocks all other doors [signal from door key cylinder switch (part of front door lock assembly LH)].

Key Reminder
When performing a door locking operation using either the main power window and door lock/unlock switch or the power window and door lock/unlock switch RH, all the doors will lock and then will immediately unlock if
- the key switch is in INSERTED position (key is in ignition key cylinder) and
- the ignition switch is in the OFF position and
- any door is open.