2002 headlight relay location? With lights in the auto position and the vehicle shut off and locked, the lights began flashing intermittently on and off. I'm assuming that this is a bad auto headlight relay, but am having difficulty finding it's location. I already have a replacement.

There is an issue, you have a dead short in the circuit, no quick fix for this. You must first get a wiring diagram of the entire circuit and then follow it until you locate the shorted wire or component.

Have you had vehicle check for DTC'S diagnostic trouble codes . Check fuse's an relays , find wiring diagrams to see what controls these systems ?
Radio/Battery fuse , fuse G 10 amp located in the right instrument panel fuse box . Do you know where this ?
Fuse Block - Right IP - On the right side of the instrument panel
An there is one on the other end of the instrument panel ,driver side .
Fuse Block - Left IP- On the left side of the instrument panel The fuel an temp . gauges not working is probably the step motors inside instrument cluster . GM had problem with this 03 to 06 .
How to repair GM Instrument Cluster Speedometer Gauge Stepper

Daytime Running Lamps (DRL)
The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level. When the BCM receives this signal it will either turn on the daytime running lights (DRL) or the headlights. Any function or condition that turns on the headlights will cancel the daytime running lamps operation. With the headlight switch in the OFF position, the headlights will either be turned ON or OFF, after an approximate 30 second delay depending on whether daylight or low light conditions are sensed. The HTR A/C IGN fuse in the underhood junction block supplies ignition positive voltage to the daytime running lamp (DRL) relay coil circuit. The DRL relay switch contacts are connected to the low beam circuit. When the headlamp switch is placed in the OFF position, the BCM will either turn on or off the daytime running lamps, depending on whether daylight or low light conditions are sensed. The BCM energizes the DRL relay, closing the switch contacts and grounding the low beam circuit. Ground is provided at G101. The DRL illuminate the low beam headlights at a reduced intensity. The DRL will operate when the ignition switch is in the ON position, the gear selector is not in the PARK position and the parking brake is released. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate.
DRL operation in Manual Transmission equipped vehicles will occur when the ignition switch is in the ON position, and the parking brake is released. - check fuse's an relay first.
Door Lock System Components
The power door lock system consists of the following components:
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Driver door lock switch

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Front Passenger door lock switch

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Body Control Module (BCM)

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Relays: Driver Door Unlock--if equipped, Door Unlock, and Door Lock

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Door Lock fuse 15A

Under your hood is a plastic box with relays in it, the headlight relay is stuck. Tap it with something and it will release. Probly should replace the relay. See owners manual or google the headlight relay location. Cheap at an auto store.

What year expedition ? The head lamps are controlled by a module (electronic module ) VSM- vehicle security module or SJB - smart junction box on newer expeditions . The module received a input from a shorted switch or light sensor or something of that nature . Having a professional type scan tool hooked up ,checking codes in the GEM or SJB would be the first step . Or you could find wiring diagrams for the inputs to the module , take your vehicle apart an test the circuits with a volt meter . You can find wiring diagrams at www.bbbind.com .

Pull this circuit breaker till you can find the problem. Check for applicable trouble codes. You have a lighting control module, I can't troubleshoot that component from here.

[Information] For a 2002 Toyota Camry, the Daytime Running Lights (DRL) operate utilizing the High Beams (inner Lamps closer to the center of the vehicle front) at a reduced power.

[The troubleshooting process:] Review the Owner's Manual and ensure the test configuration matches the following criteria:
1. According to the 2002 Toyota Camry Owner's Manual (Check your Owners Manual):
"The DRL system will make your headlights come on at a reduced brightness when:
The light switch s in the "DRL" position.
The ignition is on with the engine running.
The headlight switch is off.
The parking brake is released."

2. Set the Test Conditions according to Step 1 above.

3. Check the headlight bulbs to ensure they are not burned out. If one burns out, there is a fair chance that the other would have burned out at the same time. Replace as necessary. In this case, if the high beams operate, the DRLs should also operate.
4. Test the system, ensuring the step 1 conditions are set. (Engine running, Multi-function Switch on Turn Signals in "DRL" position, headlight switch off (repeating what the manual says -- it should be obvious that in the "DRL" position, the headlight switch should be off / do not have the switch positioned to "High Beam"), and the Parking Brake "off").
5. If DRL lights do not work, check the engine compartment Fuse and Relay Box. there is a 5 Amp DRL fuse -- replace it with the spare. Test (step 4).
6. If it does not work, swap around or replace relays -- there are three (3). Any one of them could be bad (stuck or burned out). Test (step 4).
7. Other less likely possible issues could be that the Multi-function Switch is broken or a connection / wire is broken. [Beyond the scope of this process.]

My problem was that the test configuration did not have the engine running and parking brake off - Step 1. Problem solved with much thought, repetitive tests on the vehicle and going back to the basics -- what does the Owner's Manual say and where are the applicable fuses and relays located?

For many of the 90's and 2000's Toyota various models - Camry, Tacoma, 4 Runners, Corolla, and some other models overheating is usually caused by temperature sensitive fan switch on the radiator not operating. Electric fan on the radiator should operate when temp above 200 degrees. Less often the control relay 90987-03003 is defective. Check if bubbling in the radiator smells like exhaust. That would indicate a blown head gasket. A jumper wire from your marker light positive to the lower contact in the fan control relay socket will operate your fan when parking lights are on. The larger vehicles with more powerful radiator fans will need a hefty jumper from a headlight positive to avoid overheating the lighting wiring. Make sure the engine is off and warmed up to check the radiator core with your hand to see if it is getting circulation. If it is all cold the thermostat might be stuck.

manual headlamps

Visual Inspection Chart
Mechanical Electrical

• Headlamp switch
• Multifunction switch

• Central junction box (CJB) fuse:
  • 7 (30A)
  • 30 (15A)
  • 46 (10A)
  • 47 (10A)
• Circuitry
• Headlamp bulbs
• Daytime running lamp (DRL) relay No.1

Autolamps

Visual Inspection Chart Mechanical Electrical

• Headlamp switch

• Central junction box (CJB) fuses:
  • 19 (5A)
  • 56 (30A)
• Circuitry
• Headlamp bulb
• Daytime running lamps (DRL) full relay No.1 (if equipped)
• Vehicle security module
• Photocell

If autolamp system, Vehicle security module has a headlamp rela inside of it. under left side of dash.

On repairing door locks first check the cigarette lighter and see if it works, the door locks gets it power on the same fuse. If good,you then need to check if 12VDC is at each of the actuators when pressing the switches for the locks. If no power is not at the actuator you should suspect the power lock relay to be defective. This relay is located beneath the steering column within a major cluster of connectors and is located within a bank of 3 relays located within a covered housing. These 3 relays are identical and you can temporaly reverse them to see if this will solve the problem. If it does, GM's part # is RY-232. Can't help you on the rest.......sorry!

On a 2002 saturn, the headlights are not automatic, you have to turn the knob on the end of the signal light lever to turn them off.
Also, some models are equipped with "Daytime running lights"; a safety feature. these daytime running lights are just the amber colored front signal lights, which turn on automatically when the parking brake is released to make your car more visible during daylight hours. Furthermore, if any headlight refuses to shut off, there is an electrical problem, most likely a failed relay, which are located in the underhood fuse panel and can be checked quite easily with a multimeter, relay failures are veryrare, but not unheard of, especially in vehicles equipped with aftermarket fog lights. Thankfully they are cheap and readily available and are as easy to change as a fuse.