brake sensor Oldsmobile Alero 2004 Owner's Manuals

Exterior Lamps
Headlamps
See “Headlamps” underTurn Signal/Multifunction Lever
on page 3-6.
Daytime Running Lamps (DRL)
Daytime Running Lamps (DRL) can make it easier for
others to see the front of your vehicle during the
day. DRL can be helpful in many different driving
conditions, but they can be especially helpful in the short
periods after dawn and before sunset. Fully functional
daytime running lamps are required on all vehicles
first sold in Canada.The DRL system will make your low-beam headlamps
come on at a reduced brightness when the following
conditions are met:
•The ignition is on,
•the exterior lamps control is in AUTO or the parking
lamps only position,
•the light sensor detects daytime light,
•the parking brake is released, and
•the shift lever is not in PARK (P) on vehicles with
an automatic transaxle only.
When the DRL system is on, the taillamps, sidemarker
lamps, parking lamps and instrument panel lights
will not be illuminated unless you have turned the
exterior lamps control to the parking lamp position.
As with any vehicle, you should turn on the regular
headlamp system when you need it.
3-14

Automatic Headlamp System
When it is dark enough outside, your Automatic
Headlamp System will turn on your headlamps at the
normal brightness along with other lamps such as
the taillamps, sidemarker, parking lamps and the
instrument panel lights. The radio lights will also be dim.
Your vehicle is equipped with a light sensor on the
top of the instrument panel under the defroster grill, so
be sure it is not covered which will cause the system
to be on whenever the ignition is on.
The system may also be on when driving through a
parking garage, heavy overcast weather or a tunnel.
This is normal.
There is a delay in the transition between the daytime
and nighttime operation of the DRL and the Automatic
Headlamp System so that driving under bridges or bright
overhead street lights does not affect the system. The
DRL and Automatic Headlamp Systems will only be
affected when the light sensor sees a change in lighting
lasting longer than this delay.
If you start your vehicle in a dark garage, the automatic
headlamp system will come on immediately. Once
you leave the garage, it will take approximately
one minute for the automatic headlamp system to
change to DRL if it is light outside. During that delay,your instrument panel cluster may not be as bright as
usual. Make sure your instrument panel brightness
control is in the full bright position. See “Instrument
Panel Brightness Control” underInterior Lamps
on page 3-16.
To idle your vehicle with the system off, set the parking
brake while the ignition is off. Then start the vehicle.
The system will stay off until you release the parking
brake.
As with any vehicle, you should turn on the regular
headlamps when you need them.
Headlamps Off in PARK (P)
To turn the headlamps off when it is dark outside, turn
the exterior lamps control to the parking lamp position.
In this position, the parking lamps, sidemarker lamps,
taillamps, license plate lamps and instrument panel
lights will be on, but the headlamps will be off.
To turn on the headlamps along with the other lamps
when it is dark outside, turn the exterior lamps control to
the AUTO or headlamp position.
3-15

Relays Usage
16 Air Conditioning Compressor
17 Not Used
18 Fuel Pump
19 Automatic Headlamp System
20 Automatic Headlamp System
21 Horn
22 Daytime Running Lamps (DRL)
Fuses Usage
23–32 Spare Fuse Holder
33 Rear Defog
34Accessory Power Outlets, Cigarette
Lighter
35 Generator
36 Not Used
37Air Conditioning Compressor, Body
Function Control Module
38 Automatic Transaxle
39 Powertrain Control Module (PCM)
40 Anti-Lock Brakes (ABS)
Fuses Usage
41 Ignition System
42Back-Up Lamps, Brake Transaxle
Shift Interlock
43 Horn
44 PCM
45 Parking Lamps
46Climate Control System, Air
Conditioning
47Canister Vent Valve, Exhaust
Oxygen Sensors
48 Fuel Pump, Injectors
49 Not Used
50 Right Headlamp
51 Left Headlamp
52 Cooling Fan #2
53 HVAC Blower (Climate Control)
54 Crank (V6 only)
55 Cooling Fan #2 Ground
56 Fuse Puller for Mini Fuses
57 Not Used
5-94