Fleetwood Brougham V8-350 5.7L (1991)
Ambient Light Sensor: Technical Service Bulletins
Twilight Sentinel/Antitheft - Operational Differences
Bulletin No.: T-93-36
File in Group: 9
Number: 92
Corp.Ref.No.: 219011R
Date: Dec. 1992
SUBJECT:
TWILIGHT SENTINEL AND THEFT DETERRENT OPERATION DIFFERENCES
MODELS AFFECTED:
1990-1992 DEVILLES, FLEETWOODS, AND BROUGHAMS
This bulletin supersedes T-90-72 which should be discarded. It is being revised to include new part numbers and additional system operation differences.
Some 1990-1992 DeVilles, Fleetwoods, and Broughams with option code T82 may exhibit one of the following conditions:
1.
With the twilight switch on or off, in dark ambient conditions, keyoff:
A.
When the park lamps only are turned on, the headlamps will turn on for the delay set by the twilight control switch then turn off. With the
twilight switch off, the beadlamps turn on for the minimum delay when the park lamps are turned on.
B.
When the theft deterrent is activated, the headlamps will turn on. The headlamps and park lamps will not flash. The horns will sound on and
off normally.
2.
With the twilight sentinel enabled in dark ambient conditions, when the ignition is turned off, the headlamps will turn off when either the driver's
door is opened or the brake pedal is depressed. The twilight delay is cancelled and the headlamps appear to time out early.
3.
The lights cycle on and off at dusk or on overcast days when set in twilight mode.
4.
The lights will turn off only at high light intensity levels. Complaint: Lights remain on too long as morning light increases after dawn.
5.
The lights time out in less than 90 seconds after key off when the delay switch is set at maximum delay. Service modules marked with a black X on
the lower left hand corner of the yellow label have incorporated changes to ensure a 90 second delay time. These modules must be used to repair
this condition.
To repair any or all of these conditions, replace the twilight sentinel module with GM Service P/N 16518842. Refer to Service Information Manual,
Section 9C, for replacement procedure.
Parts are currently available from GMSPO.
WARRANTY INFORMATION
