On my 2002 Saturn L100, the passenger headlight is only showing 5 volts instead of the normal 12 volts, whats wrong ?

Check this out

Question edited for clarity.

It might be a BCM issue

https://parts.toyota.com/p/Toyota__Camry/Body-Control-Module/63378233/8922006091.html

https://moduleexperts.com/5-common-symptoms-failing-body-control-module-bcm/

or fuses

View more images

Toyota Camry (2002 - 2003) - fuse box diagram - Auto ...

https://www.autogenius.info > toyota-camry-2002-2003...
Jul 31, 2016 - Toyota Camry (2002 - 2003) - fuse box diagram · Engine compartment · Engine compartment (with vehicle skid control system) · Instrument panel.

Fuse Box Diagram Toyota Camry (XV30; 2002-2006)

https://fuse-box.info > toyota > toyota-camry-xv30-200...
The fuse box is located in the instrument panel, behind the cover to the left of the steering wheel. The location of the fuses in the passenger compartment: ...

Also check for codes with a Scan tool.

Mmmmm.... start here:
2005 saturn vue bcm reprogram Google Search

and this:
http://www.saturnfans.com/forums/showthread.php?t=195610

See this:
2004 saturn bad body control module

then here:
Saturn BCM body control module Removal

Try these YOUTUBES... NOT the same year:
2004 saturn bad body control module

2002 Saturn Veu BCM issue and quick fix
(this MAY help you)?

Anthony

Power door lock's are controlled by the BCM - body control module . Are you familiar with automotive electronic's ?
Door Lock System Components
The power door lock system consists of the following components:
• Driver door lock switch--Uses a single signal wire for both lock and unlock switch activations
• Front passenger door lock switch--Uses a single signal wire for both lock and unlock switch activations
• Body control module (BCM)--Class 2 module which requires programming when replaced
• Reversible door lock actuators in each of the doors
• Body control module PWR 15A fuse--Located in the body control module fuse panel, supplies power for the door lock system

Door Lock and Unlock Operation
The BCM PWR fuse supplies battery positive voltage to the BCM for the door lock system.
The BCM supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position, the reference voltage is taken directly to ground and the BCM senses 0.0 volts on the signal circuit. If a door lock switch is placed in the unlock position, the reference voltage is taken to ground through a 1.5K ohm resistor that is internal to the door lock switches and senses approximately 2.9 volts on the signal circuit. This is how the BCM determines what portion of the door lock switch was activated.
The BCM, upon receipt of a door lock switch lock or unlock signal, will switch the appropriate door lock actuator control circuits to battery positive voltage. The opposing side of the door lock actuators are connected to ground internally within the BCM through the other door lock actuator control circuit and the doors will lock or unlock appropriately.
Vehicles without keyless entry have two internal drivers in the BCM to control the door lock actuators. All door lock and all door unlock. Vehicles equipped with keyless entry have three internal drivers in the BCM. Driver door unlock, passenger door unlock and all door lock. This is done to isolate the driver door lock actuator so it can be unlocked by itself using the keyless entry transmitter.

Odometer
The odometer is an electronic digital display. Digits displayed are illuminated by the odometer backlight bulb. The odometer backlight bulb brightness is controlled by class 2 messages from the BCM to adjust the display for daylight and instrument panel dimming operation. The trip odometer and total odometer will show in this display area. The push button in the lower right side of the speedometer is used to toggle between the trip and total odometer readings. To reset the trip odometer, push and hold the button down for at least two seconds. The total odometer display has six digits with no decimal display. The trip odometer has four digits including a decimal point and indicates tenths of a mile or kilometer.
The body control module (BCM) stores the vehicle mileage. If the BCM fails, the cluster will display the last valid mileage that was sent before the BCM failed. For replacement of the BCM refer to the BCM section of this service manual. Replacement instrument clusters do not require odometer pre-setting before installation. If the instrument cluster is replaced, the mileage stored in the BCM will be sent to the new cluster via serial data, and shown in the odometer display.

Your best bet , take it to a qualified repair shop.

Search Results

2002 saturn l200 headlights and dash lights blinking - Saturn ...

www.saturnforum.com/.../saturn-l-series.../2002-saturn-l200-headlights-...
Mar 6, 2013 - My wife told me that on occasion the headlights and the dash lights willblink when she lets off the. ... 2002 saturn l200 headlights and dash lights blinking.... 2000 LW2 dash lights Inop, spotts56, Saturn L Series Sedans & ...

Saturn l-300 wagon has flickering lights - Car Forums at Edmunds.com

forums.edmunds.com > Saturn > Saturn L300
My wagon 2003 l-300 has flickering lights and when the radio is off you can hear the ...My Dad has a 2002 Saturn Lw series wagon. the transmition has been ...

why a green light always keep flashing when running? - SaturnFans ...

www.saturnfans.com > ... > Models > Saturn S-Series > S-Series General

Apr 17, 2007 - 20 posts - ‎14 authors
S-Series General. ... A green light alwyas keep flashing when my saturn 2002 sl2 .... I had a similar issue with the headlights of a 2002 Impala, but it was an .... I never noticed on my SL2, my L200 or on my Ion now if they come ... Flashing Dash Lights
8 posts
Oct 20, 2008
Flickering lights?
9 posts
Nov 21, 2007
L300 2004 - Lights Flickering - Have some help
5 posts
Nov 2, 2005
Flickering Lights
9 posts
Feb 5, 2005
More results from www.saturnfans.com

For the original question, we had the same issue with a Saturn L100 - the fix was installing a new BCM - (Body Control Module).

check the headlight fuse if its touchin dats if its havin a partial contact

The body control module (BCM) controls the operation of the horn for the security system and remote keyless entry (RKE) functions. Circuit 28 is grounded by the BCM when the horn operation is desired. Normal operation of the horn is performed by the horn switch grounding the horn relay and is not controlled by the BCM.
You don't need to take this to a dealer ,besides there are no more saturn dealers . Try a independent repair shop .
Does the cruise control light light up when you turn the cruise on ? Have you checked the fuse's ?

no,it sounds like the bcm,body control module is bad, take it to dealer