This category on the website [ Sensors and Wiring ] we are giving you all of the information related to the individual sensors in the Buick Turbo Regal, along with the associated wiring, connector plugs, etc.
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VEHICLE APPLICATION:
Buick Regal, T-Type, Turbo T, Limited, Grand National, GNX
SENSOR NAME:
Twilight Sentinel Photo Cell Sensor
PURPOSE OF SENSOR:
gives readings to the the Twilight Sentinel module
TURNS ON-OFF / FUNCTIONS / USED WHEN:
senses ambient light levels and turns the headlights on when it is getting dark
LOCATION IN VEHICLE:
top of dash, center
(connector runs down between steering column and radio, left side of HVAC controls)
ORIGINAL GM PART NUMBER:
16502712
25513466 (original part) discontinued April 1984
25502553 discontinued August 1989
10045823 discontinued April 1995
25521070 (final replacement) discontinued January 1996
SENSOR / BASE COLOR:
black, blue
CONNECTOR PLUG COLOR (SENSOR SIDE):
black
WIRES ATTACHED (SENSOR SIDE):
2, white
CONNECTOR PLUG COLOR (HARNESS SIDE):
black
NUMBER OF WIRES ATTACHED (HARNESS SIDE):
2
COLOR & PURPOSE OF (HARNESS SIDE) WIRES:
black, goes to (junction) to head light switch “B”
white, goes to (junction) to sentinel amplifier “J” (photocell input)
THINGS TO KNOW ABOUT THIS ITEM:
The dial on dash adjusts the sensitivity (turn on point) for the Twilight Sentinel system.
[most users turn it all the way down]
[SEE the Twilight Sentinel relay post]
[SEE the Twilight Sentinel switch post]
OTHER NOTES:
The photo cell sensor works with the Twilight Sentinel Module Relay Switch.
T82 rpo option code on trunk sticker
Not all Turbo Regals have the factory wiring in place, but generally if you have the factory alarm system the wiring is already there for the twilight system.
The last photo herein shows the “Twilight Sentinel Photo Cell Holder & Retainer”
(GbodyParts has these available as repops. They say: The holder part is louvered to allow a certain amount of light into the photo cell. We have also reproduced the Rubber Foam Ring which was never available from GM. This ring is what holds the cell tight in place.)
The Twilight Sentinel option was available on all of the other G-body vehicles as well.
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you can see here: 1984/1985 sensor locations
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PHOTOS OF SENSOR AND CONNECTED WIRES:
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Here’s a list of all of the sensors in the Buick Regal:
(you can click the links to go to the one you need info about, after they’re published)
* Air Temperature Intake Sensor (IAT; MAT; ATS)
* Camshaft Sensor (CAM)
* Coolant Temperature Sensor (CTS)
* Crank Sensor
* Knock Sensor
* Mass Air Flow Sensor (MAF)
* Manifold Air Pressure Sensor (MAP)
* Oxygen Sensor (O2, narrowband)
* Throttle Position Sensor (TPS)
* Turbo Boost Gage Sensor
* Twilight Sentinel Photo Cell Sensor
* Vehicle Speed Sensor
* Wideband Oxygen Sensor (WBO2)
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