Chevrolet ranger rt Owner's Manual page 56

Alarms and Warnings
53
The detector may chirp every 15 seconds or so if the
coach batteries are running low.
The Carbon Monoxide and Propane Leak detector is located on
the passenger side, near the floor under the TV. These detectors
have a service life, beyond which point they need to be replaced.
The detector requires no maintenance other than periodic
replacement. See User Manual supplied with the unit for
replacement intervals.
Smoke alarm
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