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Left blinker works, but left daytime running light does not.

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  • badair771 Aug 03, 2008

    the drl is also the blinker...not the high beam

  • badair771 Aug 04, 2008

    Light bulb is good.. both filaments are working. One strange thing..Sometimes the turn signal arrows on the dash illuminate when I release the parking brake. They stay on all the time and the drl works. The park lights in the rear are also on all the time. When this happens, the blinkers work fine. Sometimes when this is not happening, I lose the left drl, but blinker works. Rear park lights go off. What a mess.

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The DRL is usually a high beam run at about 80%. Do both high beam bulbs work? If not, replace the bad one. If they do work as high beams but not as DRLs, replace the DRL relay.

Posted on Aug 02, 2008

  • Jeremy Dellow
    Jeremy Dellow Aug 04, 2008

    OK, did not realize your car used the marker lights as DRLs. Did you verify the bulb is OK? There should be two filaments inside - one for turn signal, one for DRL/marker light. It could be that you lost the DRL filament but not the turn signal filament.

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Why do my running lights turn off when same side blinker is activated, is this normal?


it indicates that the earth points for the indicators are earthing back through the running lights earth system
if both low beams are not working I would suspect power supply ( relay) rather than both bulbs
if the vehicle is a ford I would suggest that the light control module may be faulty

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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
--

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I have no brake lights, the blinkers run really fast and if the headlights are on the blinkers will not run at all while braking. Any ideas?


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A good place to start.

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Shortage


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I had this issue with my 1999 C1500.  I had to jump my truck a couple of times, because I left the inside light on and I found when I did this my daytime running lights worked briefly.  I wondered why, but didn't give it much thought.  I had to replace my battery a couple of months ago and my daytime running lights started working all the time.  Even though my battery would start my vehicle, run the interior components, etc., it didn't have enough voltage for the daytime lights.  Check your battery voltage under a load, see if it helps.

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