sensor CADILLAC CATERA 1999 1.G Owners Manual

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2-45
If you rotate the control dial all the way up, the lamps
will remain on for about three minutes after the ignition
has been turned to OFF or LOCK. If you rotate the
control dial all the way down, the lamps will go off
quickly. You can adjust the delay time from a few
seconds up to three minutes.
To turn the Twilight Sentinel off, press the OFF button
again. The indicator light in the button will be on. This
lets the driver know that the system has been turned off.
The Twilight Sentinel also turns off if the ignition is
turned to OFF or to LOCK.
This light in the instrument
panel will come on if the
ignition is on and:

the headlamps have not been manually turned on,

the Twilight Sentinel senses it is dark outside,

the Twilight Sentinel is OFF and

the transmission is not in PARK (P).Light Sensor
The light sensor for the
Twilight Sentinel is located
in the center of the front
defogger grille, near
the windshield.
If you cover the sensor, it will read ªdarkº and the
parking lamps and low
-beam headlamps will come on.

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2-64
Warning lights come on when there may be or is a
problem with one of your vehicle's functions. As you
will see in the details on the next few pages, some
warning lights come on briefly when you start the
engine just to let you know they're working. If you are
familiar with this section, you should not be alarmed
when this happens.
Gages can indicate when there may be or is a problem
with one of your vehicle's functions. Often gages and
warning lights work together to let you know when
there's a problem with your vehicle.
When one of the warning lights comes on and stays on
when you are driving, or when one of the gages shows
there may be a problem, check the section that tells you
what to do about it. Please follow this manual's advice.
Waiting to do repairs can be costly
-- and even
dangerous. So please get to know your warning lights
and gages. They're a big help.
Safety Belt Reminder Light
When the key is turned to ON or START, a tone will
come on for about eight seconds to remind people to
fasten their safety belts, unless the driver's safety belt is
already buckled.
The safety belt light will
also come on and stay on
for about four seconds, then
it will flash for about
60 seconds.
If the driver's belt is already buckled, neither the tone
nor the light will come on.
Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel, which shows the air bag symbol. The system
checks the air bag's electrical system for malfunctions.
The light tells you if there is an electrical problem. The
system check includes the air bag sensors, the air bag
modules, the wiring and the diagnostic module. For
more information on the air bag system, see ªAir Bagº
in the Index.

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2-69 Engine Coolant Temperature Gage
This gage shows the engine
coolant temperature. If the
gage pointer moves into the
red area, the engine is
too hot!
This reading means the same thing as the warning
light
-- the engine coolant has overheated. You should
stop the car and turn the engine off as soon as possible.
See ªEngine Overheatingº in the Index.
Low Coolant Warning Light
This warning light should
come on for a few seconds
while you are starting the
engine. If the light doesn't
come on, have it repaired.
Your vehicle is equipped with a low coolant level sensor
(switch and float) that is designed to detect when your
vehicle's coolant level drops below the set limit. If the
low coolant level sensor (under the coolant surge tank)
detects that the level drops while the engine is running,
the low coolant indicator will light and remain lit until
the ignition switch is turned off. Check the coolant level
and add coolant as needed. The light should turn off as
soon as the coolant level is at its proper operating range.

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3-3
Outside Temperature Display
The outside temperature is always displayed when your
vehicle's ignition is on. If the outside temperature
display begins to flash, this means that icy road
conditions are possible. Adjust your driving if needed.
The display will flash for about 30 seconds and then
remain on steady.
Mode Button
Press this button to deliver air through the floor, middle
or windshield outlets. The climate control system will
stay in the selected ECC mode until the MODE button is
pressed again or until the TEMP/AUTO knob is pressed.
Press the up or down arrow to see the available modes.
English/Metric Display
You can change the temperature display from English
(degrees Fahrenheit) to metric (degrees Celsius) by
pressing and holding the driver's side TEMP/AUTO
knob for approximately five seconds. Repeat the process
to change back to English from metric.Automatic Operation
Pressing the driver's side TEMP/AUTO knob sets the
system for automatic operation. Once the system is set,
sensors will control the air delivery mode. Air will come
from the floor, middle, side or windshield outlets. The
fan speed will vary as the system maintains the selected
temperature setting. (All previous manually set mode
settings will change back to a fully automatic mode
when the climate control system is turned on this way.)
Be careful not to put anything over the solar sensor
located in the middle of the instrument panel near the
windshield. This sensor is used by the automatic system
to regulate temperature.
To find your comfort zone, start with the 75
F (24
C)
setting and allow about 20 minutes for the system to
regulate air temperature. Adjust the temperature if
necessary. If you choose 60
F (16
C), the system will
remain at that maximum cooling setting and will not
regulate fan speed. If you choose the temperature of
90
F (32
C), the system will remain at that maximum
heating setting and will not regulate fan speed. Choosing
either maximum setting will not cause the system to heat
or cool any faster.

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6-27
When your brake fluid falls to a low level, your brake
warning light will come on. See ªBrake System Warning
Lightº in the Index.
What to Add
When you do need brake fluid, use only DOT
-3 brake
fluid. Use new brake fluid from a sealed container only.
Refer to ªRecommended Fluids and Lubricantsº in the
Maintenance Schedule booklet.
Always clean the brake fluid reservoir cap and the area
around the cap before removing it. This will help keep
dirt from entering the reservoir.
CAUTION:
With the wrong kind of fluid in your brake
system, your brakes may not work well, or they
may not even work at all. This could cause a
crash. Always use the proper brake fluid.
NOTICE:

Using the wrong fluid can badly damage
brake system parts. For example, just a few
drops of mineral
-based oil, such as engine
oil, in your brake system can damage brake
system parts so badly that they'll have to be
replaced. Don't let someone put in the
wrong kind of fluid.

If you spill brake fluid on your vehicle's
painted surfaces, the paint finish can be
damaged. Be careful not to spill brake fluid
on your vehicle. If you do, wash it off
immediately. See ªAppearance Careº in
the Index.
Brake Wear
Your vehicle has four-wheel disc brakes.
Your vehicle has electronic wear sensors that let you
know when the front brake pads are significantly worn
and new pads are needed. The brake pad wear indicator
light will come on and stay on when the brake pads are
worn and need to be replaced. (See ªBrake Pad Wear
Indicator Lightº in the Index.)

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6-58
Fuse Usage
4 RH and LH Rear Seat Cushion Heater
Relay, Rear Sunshade Motor
5 Transmission Control Module
6 Radio Speaker Amplifier
7 RH and LH Rear Side Door Window
Regulator Motor
8 Headlamp Switch, Turn Signal Switch,
Horn Relay, CD Changer,
Multifunction Relay
9 Windshield Wiper Motor and Relay,
Windshield Wiper and Windshield
Washer Switch
10 Body Control Module (BCM), Heater
Water Auxiliary Pump, Fan Control
Relays, Auxiliary Water Pump Relay
11 Heater and A/C Control, RH and LH
Outside Rearview Mirrors
12 Hazard Warning Switch, Instrument
Cluster, Data Link Connector (DLC),
Stoplamp Switch, Gage Cluster, Heater
and A/C Control.
13 Remote Control Outside Rearview Mirror
Switch, A/C Compressor Relay, Coolant
Fan Test Connector, A/C Load SwitchFuse Usage
14 Cellular Telephone, RH and LH
Windshield Washer Nozzles, Driver and
Passenger Heated Seat Switch, Heater and
A/C Control, Heated Outside Rearview
Mirror and Rear Window Defogger Relay
15 Rear Suspension Leveling Air
Compressor Relay, Instrument Cluster,
Gage Cluster, Cruise Control Switch,
Headlamp Switch, Multifunction Relay,
Passenger and Driver Heated Seat Relay,
BCM, Sunroof Actuator, Automatic Level
Control Sensor, RH and LH Heated Rear
Seat Switch, RH and LH Heated Rear
Seat Cushion Relay, Driver Seat Adjuster
Memory Module, LH Front Side Door
Window Switch, Inside Rearview Mirror
16 Cigarette Lighter (Front and Console)
17 Horn #1 and #2
18 Fuel Pump
19 Electronic Brake/Traction Control
Module
20 Passenger and Driver Heated Seat Relay
21 Daytime Running Lamp (DRL) Relay,
LH High
-Beam Headlamp Relay

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6-59
Fuse Usage
22 Headlamp Switch, LH
Low
-Beam Headlamp
23 LH Parking Lamp and Turn Signal
Lamps, LH Rear Sidemarker Lamp,
Multifunction Relay, LH Stoplamp
and Taillamp
24 Lifting Magnet, BCM, Gage Cluster
25 Sunroof Actuator
26 Headlamp Switch, RH and LH Front
Sidemarker Lamp, Middle Taillamp, RH
and LH Rear License Plate Lamp, Radio,
Automatic Transmission Control
Indicator, Heater and A/C Control
27 Automatic Level Control Sensor, Rear
Suspension Leveling Air Compressor
and RelayFuse Usage
28 Door Lock Relay, OnStar

Connector
29 Multifunction Relay
30 RH Parking Lamp and Turn Signal Lamp,
RH Rear Sidemarker Lamp, RH
Stoplamp and Taillamp
31 RH Low
-Beam Headlamp Turn
Signal Switch
32 RH High
-Beam Headlamp Relay
33 Blower Controller, A/C
Compressor Relay
34 Heated Rear Window Defogger Relay
35 Passenger Seat Adjuster Switch, Driver
Seat Adjuster Memory Module

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8-6
Inflation, Tire Pressure 6-38 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brightness Control 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Top 6-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cluster 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Lamps 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Plastic Components, Cleaning 6-48 . . . . . . . . . . . . . .
Jack, Tire 5-20, 5-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyless Entry System, Remote 2-7 . . . . . . . . . . . . . . . . . . . .
Keys 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Labels
Certification 4-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Parts Identification 6-54 . . . . . . . . . . . . . . . . . . . . .
Tire-Loading Information 4-29 . . . . . . . . . . . . . . . . . . . . . .
Vehicle Identification Number (VIN) 6-54 . . . . . . . . . . . . .
Lamps
Exterior 2
-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Map 2-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Reminder 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Panel 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Reading 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lap-Shoulder Belt 1-16, 1-33 . . . . . . . . . . . . . . . . . . . . . . . . .
Leaving Your Vehicle 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leaving Your Vehicle with the Engine Running 2-27 . . . . . . . Leveling Indicator Light 2
-76 . . . . . . . . . . . . . . . . . . . . . . . . .
Light Sensor, Twilight Sentinel
2-44 . . . . . . . . . . . . . . . . . . .
Lighter 2-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lighting, Perimeter 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lights
Air Bag Readiness 1
-27, 2-64 . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock Brake System Warning 2-67, 4-7 . . . . . . . . . . . .
Automatic Transmission Warning 2-76 . . . . . . . . . . . . . . . .
Brake Pad Wear Indicator 2-76 . . . . . . . . . . . . . . . . . . . . . .
Brake System Warning 2-66 . . . . . . . . . . . . . . . . . . . . . . . . .
Brake To Shift 2-73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System Indicator 2-65 . . . . . . . . . . . . . . . . . . . . . .
Check Engine 2-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Oil 2-73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 2-74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Coolant Temperature Warning 2-68 . . . . . . . . . . . . .
Fuel Cap Indicator 2-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leveling Indicator 2-76 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Coolant Warning 2-69 . . . . . . . . . . . . . . . . . . . . . . . . .
Low Fuel 2-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Washer Fluid Warning 2-74 . . . . . . . . . . . . . . . . . . . . .
Oil Pressure 2-72 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belt Reminder 1-11, 2-64 . . . . . . . . . . . . . . . . . . . . .
Traction Control System Warning 2-68, 4-9 . . . . . . . . . . . .
Trunk Ajar 2-74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading Your Vehicle 4-29 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locks
Anti
-Lockout Feature 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Door 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Door 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .