Question about 2001 Chevrolet Blazer

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93 chev Blazer

Daytime running lights come on when vehicle is started.
Turn lowbeam headlights on, daytime running lights go out.
Turn high beams on and they work fine.
Turn lights off, daytime running lights come on again.
Why are the lowbeam headlights not working?

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  • Anonymous Mar 21, 2014

    2000 Mazda MPV have changed bulbs and fuses but still not working marker lights all work but daytime/lowbeam/highbream do not work at all any ideas?

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  • Master
  • 5,158 Answers

Perhaps i missed something here... lowbeams and daytime lights are about the same.... be that as it may... the merely obvious thing is that the low beams are burnt out.... next thing would be that the relay for the day time lights could be defective... it's often mounted on the firewall.

Robert

Posted on Dec 16, 2008

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I need clarification on 2003 Chev Malibu DRL problems:


That piece you think is a ceramic DRL module is a resistor , When in DRL mode voltage to the low beam headlamps circuit goes through that resistor dimming the headlamps from low beam to daytime running lamps . It sounds to me like you need a new resistor ,but without doing some electrical testing it could be a lot of things . The DRL relay in the under hood fuse box could have a problem , could be the BCM - body control module , the ambient light sensor etc... Here is how daytime running lamps work .
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.

Feb 25, 2016 | Cars & Trucks

2 Answers

All of my running lights and blinkers work and high beams but no low beams on my 1997 Chevrolet TahoeA


Headlamps Inoperative - Low Beams

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic procedure should only be used if the high beam headlamps are operating properly and the low beams are inoperative.

1

Did you perform the Headlights System Check?
--
Go to Step 2
Go to Headlight System Check

2

  1. Turn the headlamp and panel dimmer switch to the ON position.
  2. Move the headlamp dimmer switch to the LOW position.
  3. Backprobe the headlamp dimmer switch connector with a J 35616-200 from cavity A to ground.

Does the test lamp light?
--
Go to Step 3
Go to Step 5

3

  1. Remove the daytime running lamp relay.
  2. Connect a J 35616-200 at cavity G5 to ground.

Does the test lamp light?
--
Go to Step 4
Go to Step 6

4

  1. Re-install the daytime running lamp relay.
  2. Backprobe cavity B at the high/low beam headlamp with the headlamp dimmer switch in the LOW position.

Does the test lamp light?
--
Go to Step 7
Go to Step 8

5

Replace the headlamp dimmer switch.

Is the repair complete?
--
Go to Headlight System Check
--

6

Repair the open in CKT 359 (PPL) between the headlamp dimmer switch and the daytime running lamp relay.

Is the repair complete?
--
Go to Headlight System Check
--

7

Replace the high/low beam headlamps.

Is the repair complete?
--
Go to Headlight System Check
--

8

  1. Inspect for an open in CKT 12 (TAN) between the daytime running lamp relay and S120, repair as necessary.
  2. Replace the daytime running lamp relay if no open was found in CKT 12 (TAN) between the daytime running lamp relay and S120.

Is the repair complete?
--
Go to Headlight System Check
--

Jul 24, 2015 | Chevrolet Cars & Trucks

1 Answer

I have a 93 jeep laredo, the daytime running lights are staying on even when the vehicle is turned off. The dimmer switch for the high beams doesn't work anymore. I am thinking if I replace the dimmer...


93 Jeep Loredos didn't have daytime running lights from the factory. It has to be an after market set up so I would trace wires to power and ground. It probably has a connection to the headlight switch wires through some sort of solenoid.

Jul 19, 2011 | Jeep Cherokee Cars & Trucks

1 Answer

I have been having some problems with my headlights not running properly. The automatic headlights don't go on automatically anymore and now when I try to turn on the lights manually that doesn't always...


there is a relay under the hood in the fuse/relay panel called drl, or daytime running lamps, that relay is most likely bad, a good way to tell is switch it with the high beam relay, if they come on you know thats it, if they dont, its the relay for the lowbeams, again switch it with the high beam relay and see.. either way i can tell you for sure one of those two are bad... but most of the time it is the daytime running lamps, or sometimes called driving lights relay. hope this helps you

Dec 03, 2010 | 1999 Buick Century

1 Answer

Car: 2000 Chev Cavalier 4dr 2.2L? 4 cylinder car? My problem is this my low dim lights are very low, my high beams works only when I hold the lever arm ? (Not sure how to explain this?) any ideas what...


First, be sure that the headlights are actually coming on. These cars have daytime running lights that use the headlight bulbs at a lower voltage. If the car is only using the daytime running lights, the tail lights will not be on with the headlights. The multifunction lever always turns on the high beams when you pull on it (it's called 'flash to pass'). Make sure the headlight switch is working, and also check the headlight circuit breaker.

Nov 17, 2010 | 2000 Chevrolet Cavalier

1 Answer

Auto lighting of daytime running (low beam) lamps


Yes. These are called DRL's or daytime running lights. It is law that vehicles manufactured after 1985 must have low amperage lighting on while running.

Aug 04, 2009 | 2008 Chevrolet Malibu

4 Answers

Daytime running lights work but go out when I turn headlights on. Ruled out headlight switch, bulbs, fuses, relay, ground, and DRL module. 98 silverado 1500 has no high beams. headlights work with parking...


If you have daytime running lights but when you turn on your regular headlight on they do not come on. Take the bottom of your steering column off (Two Small Screws) and look at the back of your turn/dimmer switch make sure that the light blue wire is connected. The wires will break off after years of raising and lowering your steering column.

Jun 03, 2009 | 2000 Chevrolet Blazer

1 Answer

Headlights alternate on and off left and right daytime/high beam


although the underhood relay panel is common, I'd check your headlamp bulbs first, these are cheaper than the fuse box. The daytime running lights work off the high beam circuit, thus, a blown highbeam bulb could be the culprit, the fusebox solution was more common on 2001 and up modles, although it's a definite possibility.

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1 Answer

Daytime safty lights


Sounds like the bulbs need replacement. The high beams are separate from the low beam/daytime running lights.

May 18, 2008 | 1990 Buick Century

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