Chevrolet 2006 Colorado Owner's Manual page 170

Lock 2: On vehicles with an automatic transmission,
this mode locks all of the doors when the vehicle
is shifted out of PARK (P) and unlocks the driver's door
when the vehicle is shifted into PARK (P).
On vehicles with a manual transmission, this mode
locks all of the doors when the vehicle speed is greater
than 15 mph (24 km/h) and unlocks the driver's door
when the key is removed from the ignition.
Lock 3: On vehicles with an automatic transmission,
this mode locks all of the doors when the vehicle
is shifted out of PARK (P). The doors will not
automatically unlock.
On vehicles with a manual transmission, this mode
locks all of the doors when the vehicle speed is
greater than 15 mph (24 km/h). The doors will not
automatically unlock.
Remote Keyless Entry Feedback
This feature allows you to program your remote keyless
entry feedback to a preferred setting.
To set your choice for this feature, perform the
following steps:
1. With the engine off, turn the key to LOCK. Do not
remove the key from the ignition.
2. Press and hold the lock and unlock buttons on the
remote keyless entry transmitter at the same time.
Hold both buttons until the DIC display shows
the current remote keyless entry feedback mode.
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3. To view the next available mode, press and hold
the reset stem for approximately two seconds.
Release the reset stem and press and hold again to
view each mode.
4. Once the desired mode is shown on the DIC
display, briefly press the reset stem to set your
choice. The DIC display will then clear.
The following are the available modes:
RFA 1 (default): This mode flashes the parking lamps
when you press the lock or unlock buttons on the
remote keyless entry transmitter.
RFA 2: This mode flashes the parking lamps and
sounds the horn when you press the lock button on the
remote keyless entry transmitter. This mode also
flashes the parking lamps when you press the unlock
button on the remote keyless entry transmitter.
RFA 3: This mode flashes the parking lamps and
sounds the horn when you press the lock or unlock
buttons on the remote keyless entry transmitter.
RFA 4: This mode disables remote keyless entry
feedback. There will be no feedback when you press
the lock or unlock buttons on the remote keyless
entry transmitter.