Is it related to the DRL relay - Cars & Trucks

Daytime Running Lamps
Daytime running lamps are standard on all Saturn models. The DRL relay is located in the UHFB. The coil side of the DRL relay receives battery voltage through the left headlamp fuse. Battery voltage flows through the DRL relay coil to the body control module through CKT 592. The BCM will ground CKT 592 when DRL is required. The BCM uses ignition, park lamp, headlamp, high beam and park brake inputs to control DRL. The DRL will be enabled anytime the ignition is in the RUN position, the headlamp switch is Off and the park brake switch is Off.
Battery voltage is supplied through the left headlamp fuse to CKT 40 to the left high beam lamp. Voltage flows through the left high beam lamp to the IPFB through CKT 1200. Voltage flows to the right DRL relay located in the IPFB through CKT 593. The BCM provides ground to CKT 592 to energize the relay. Voltage flows through the closed contacts of the DRL relay to ground through CKT 150 to the forward lamp ground splice pack. This circuit results in both high beam lamps being connected in series, which allows the high beam lights to operate at half brightness.
The BCM will turn Off the DRL relay when it sees any of the following inputs:
• Gear selector in PARK
• Headlamps ON
• Parking brake ON
• Ignition not in the RUN position
• When automatic lighting control is ON and it is dark outside
The BCM uses the high beam input to determine if the DRL functions are working. If the DRL functions are not operating properly a diagnostic trouble code may be set. Refer to diagnosis in this section for further information.


Before having the BCM repaired as you say ,was it checked for DTC'S - diagnostic trouble codes ? An who repaired it ?

DTC B2600

The daytime running lamps (DRL) are controlled by the body control module (BCM). The BCM grounds the DRL relay control circuit in order to energize the DRL relay coil. This action provides a path to ground for the RH and LH headlamps through the DRL relay and the DRL resistor. The DRL resistor reduces the intensity of the low beam headlamps for DRL operation. The BCM monitors the low and high beam circuits to ensure that the DRLs are operating properly. If the BCM senses that the DRLs are not operating properly, DTC B2600 is set.

The DRL relay or DRL resistor is probably the problem .

DTC B2602

Circuit Description
Daytime running lamps (DRL) are controlled by the body control module (BCM) based on input from the high beam headlamp circuit 1201, the low beam headlamp circuit 1200, the parking brake circuit 1134 and ignition switch state.
When DRL operation is desired, the BCM switches circuit 592 to ground. This action energizes the DRL relay. When energized, the DRL relay operates the left high beam headlamp and right high beam headlamp as a series circuit (one-half of battery voltage across each high beam headlamp).
When DRL operation is not desired, the BCM does not provide ground for the DRL relay. When not energized (as when high beam headlamps are desired) the DRL relay operates the right and left high beam headlamps as a parallel circuit (full battery voltage across each high beam headlamp).
For DRL operation, the parking brake must be fully released, the ignition switch must be in the RUN position and headlamp switch must be in the OFF position. Under normal operating conditions, the feedback voltage to the BCM measured at circuit 1200 is 6-8 volts.


DTC B2603


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

The DRL - daytime running lamps relay is a PCB type relay - printed circuit board , soldered on the circuit board inside the under hood fuse box. The dealer would tell you that it is non serviceable an you need to replace the whole fuse / relay box. If you know how to solder on circuit boards replacement relay's can be found on the internet . Or if you know how to test electrical circuits ,have a wiring diagram for that circuit you can by pass with a external relay kit.

Daytime Running Lamps (DRL) and Automatic Lamp Control (ALC)
The low beam headlamps are used for DRL operation at a reduced intensity. The DRLs will operate only while the engine is running and the headlamp switch is in the AUTO position. When the DRLs are ON, no other exterior lamps such as the parking lamps, tail lamps, etc. will be on when the DRL are being used. The instrument panel will not be illuminated either.
DRL operation is determined by the ambient light sensor and controlled by the body control module (BCM). The ambient light sensor is a light-sensitive transistor used to monitor outside lighting conditions. The BCM provides a 5-volt reference signal to the sensor while ground is provided at G202. The sensor will vary this voltage signal between 0.2 and 4.9 volts depending on outside lighting conditions. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either DRL or ALC operation. When the BCM determines the conditions are met for DRL operation, it applies ground to the DRL relay control circuit energizing the DRL PCB Relay. With the relay energized, battery voltage is applied through the switch side of the relay, the DRL 1 fuse, a resistor wire to the DRL 2 fuse, both low beam headlamp fuses, and the low beam supply voltage circuits illuminating the headlamps at a reduced intensity. Any function or condition that turns on the headlamps will cancel DRL operation.
When the BCM detects low light conditions, it will turn OFF the daytime running lamps and turn ON the low beam headlamps as described above in Low Beam Headlamp Operation. The BCM will also turn ON the low beam headlamps in daylight conditions when the windshield wipers are turned ON.

Your best bet mite be to have a qualified repair shop check it out ,could DTC'S - diagnostic trouble codes stored in the BCM - body control module . Like this one
DTC B2600
DTC B2600 00: Daytime Running Lamp Control Circuit

welcome to a USA forum
we dont have that car in usa,not one.ENDED HERE 2001.
nor that diesel
nor that DRL JUNK( proven useless by SCIENCE!!)
DID you scan it first., seems not.
the DRL in all cars(generic answerS..........

DRL CAN GO OFF LINE FOR THESE REASONS.
1: brake failure lamp on.
2:ALTernator failing..scanning really does help, for surel
3: DRL model if presest bad.
4:DLR dropping resistor block burned open newer cars are PWM modulated and no more block resistor.
5:fuses blown related
6: wire bad related.
pray tell buy the sevice manual yet read the DRL page and
see how it works and the tests.
as they say , you cant fix it if you dont know how it works.
rings true:

all that it basic theory
i gap the book and meter
and find the cause, electrics101 , works every time.
next time post to a forum in your country
and10x faser answers
10x more accurate,not generic.

are you in USA.?
are you in Canada with mandatory DRL lighting?
we can not guess that,
DRL car is complex.
DRL has a 20 pin module just for DRL, crazy complex.
the FLASH on DRL grounds the HL directly bypassing DRL relay
so is super important the FLASH test.
There are 2 systems used, the toyota uses hot all time headlights
(via the HL relay and dimmer relay)


I need this?
is it dim on high, yes,
is it dim on low, no.
is it dim , when you push the lever to FLASH.??????
if flash works we know why it fails. see? (paths)
see?
if high beams and FLASH are dim, then DRL relay bad.
(can be other failures., for sure even wires bad)

its just a:
Toyota Corolla. Gen 6 to 8. (in snake skins)
if you have voltmeter this is child's play , really
finding point of voltage drop tells you what is wrong
find a shop with sparks guy? be best or by a meter and learn>?
guessing can take a long long weekend.
is labor time not a matter to you or down time?
ok I pulled up your cars HL schematic.
DRL is super complex
id pull the DRL module and look for burned pins
they love to do that DRL does.
so got DRL
and does FLASH work right>?

The DRL 10-amp fuse in the underhood fuse block supplies battery positive voltage to the DRL relay switch contacts and relay coil. When the BCM energizes the DRL relay , the DRL receive voltage on the DRL supply voltage circuit.

if replacing the high beam bulbs do not fix the DRL issue ,see my tip under 2001 to 2005 civic daytime module repair.The accord you have has the same module.

looks like there is 2 fuses and 2 relays (you can see them in wiring diagram. They are in underhood fuse box... Hope this helps.

It sounds like your DRL RELAY/Headlight relay. I had this happen with a 2000.

Please rate me if this helps You.

Here is some info that I hope is helpful to you.

This first part is how to disable the DRL
TOYOTA. From the Toyota technical service bulletin EL011-00 Web site for specific models determine where the module is; either the DRL relay or the body ECU, connector number, pin #. Oct 6,2000.

Avalon 1999 DRL relay D4 pin 1
Avalon 2000 body ECU B5 pin 6
Camry S/D 99* DRL relay D6 pin 23
Camry S/D 00* DRL relay D6 pin 10 *twilight sentinel
Camry Solara99/00* DRL relay D6 pin 23
Celica 2000* body ECU B6 pin 17
Corolla 99/00* DRL relay D3 pin 23
ECHO 2000 DRL relay D2 pin 12
4Runner 2000 DRL relay D8 pin 2
Land Cruiser 99/00 DRL relay D8 pin 2
MR2 Spyder 2000 DRL relay D2 pin 12
RAV4 99/00 DRL relay D17 pin 2
Sierra 99/00 DRL relay D4 pin 2
Tacoma 2000 DRL relay D8 pin 2
Tundra 2000 DRL relay D7 pin 2
-disconnect battery- Then remove the wire with pin attached and tape to the harness. (consider just cut and tape the wire) -check operation- [except the 2000 MY-Avalon, additionally you need to ground the wire at the module end of the cut wire]


And here is the Headlamp relay part number.

ACDELCO E1717C [RELAY-HEADLAMP] RELAY,HDLP OEM#89057700 ALL MAKES

Yes your daytime running light just uses the headlight bulb on a lower voltage so if the headlight is not working the drl will not work as well, they are dirrectly related,,check the head light fuse,and check to make sure the bulb is good,,

First identify if your day running lights (DRL) are working. The DRL and high beams will work on the same relay. If your DRL are working, but not your high beams, you may need to replace your high beam relay which is found in the fuse panel under the hood of the engine at the right back corner; near the firewall, and passenger tire strut mount. If there is also a problem with your DRL with the high beams, its likely the DRL relay which can be found tucked under the dash.

There's usually a cover that says "relays", "fuses", etc. Lift the cover and look underneath, it should label the relays. If not, consult a manual or repair book. Try swapping similar relays from know working accessories if you don't have a new one handy.