Chevrolet 2004 Impala Owner's Manual page 77

Power Door Locks
Press the top of the switch to unlock all doors, or press
the bottom part of the switch to lock all doors.
The rear doors do not have power door lock switches.
The manual lever on each rear door works only that
door's lock.
If your vehicle has the optional content theft-deterrent
system and it is armed, the power door lock switches will
be disabled. You must use your remote keyless entry
transmitter or your key to unlock the doors when
the system is armed.
A power door lock switch
is located on each front
door above the armrest.
Programmable Automatic Door
Locks
Programmable automatic power door locks are a
standard feature that is intended to provide enhanced
security and convenience by automatically locking
and unlocking doors.
Programmable Modes
Mode 1: No automatic door lock or unlock.
Mode 2: Automatic all-door lock when the transaxle is
shifted out of PARK (P); no automatic door unlock.
Mode 3: Automatic all-door lock when the transaxle is
shifted out of PARK (P); automatic unlock for the
driver's door only when the transaxle is shifted into
PARK (P).
Mode 4: Automatic all-door lock when the transaxle is
shifted out of PARK (P); automatic all-door unlock
when the transaxle is shifted into PARK (P).
Your vehicle was originally programmed to Mode 4. The
mode may have been changed since then. To
determine the current mode, or to change the mode,
see Vehicle Personalization on page 2-45.
Disconnecting the battery for up to a year will not
change the programmed mode of the programmable
automatic power door locks.
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