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DRL is not working

Tiny
CTORRES
  • MEMBER
  • 2016 TOYOTA COROLLA
  • 1.8L
  • 12,000 MILES
I had some problem with headlights in my car. I fixed but I don’t know what happen but the DRL system in not working.
2CarPros help me.
Monday, April 6th, 2020 AT 2:34 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hi,

Can you explain what was done with the headlamps already? As far as the DRL system, I need you to check a couple fuses for me. See the attached portion of the wiring schematic. It shows where power comes from the fuse box to the electronic control unit (ECU). Then from there, power is distributed to the DRL lights.

In addition to just checking the fuses, make sure they are fully inserted and there are no issues with contact. Also, if the fuses are good, then please confirm there is power to the fuse itself.

Here are a few links you may find helpful:

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

_____________________________________

Let me know if this helps. Note that if the fuses are good, then we need to confirm it is getting to the ECU and a signal out to the lamps is present.

Take care,
Joe
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Tuesday, April 7th, 2020 AT 9:12 AM
Tiny
CTORRES
  • MEMBER
  • 59 POSTS
Hi Joe, well I replaced the junction block and ECU in my car. There are sulfation. Now with my test lamp and multi-meter I was checking the fuse (ECU IG 1 and ACC fuses) are good. On the junction block I identified the 2 blue wires (A28 and A49). I tested with my multi-meter but I don’t have voltage. I don’t know if its day does not have voltage, but yesterday at night I checked and neither has voltage. May be a did some bad.
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Tuesday, April 7th, 2020 AT 2:38 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hi,

Is the power getting through the fuse but not available at the ECM? If you back probe the wires, is there power?

Thanks,

Joe
PS: I hope you are well.
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Tuesday, April 7th, 2020 AT 6:21 PM
Tiny
CTORRES
  • MEMBER
  • 59 POSTS
Hi. Joe, power go through fuses but never go out the blue wires. I checked the power again blue wires but nothing happened. With your experience which is the next step?
Thanks.
CTORRES.
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Wednesday, April 8th, 2020 AT 11:57 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hi,

If there is power in and out to the fuse but it doesn't make it to the wires, there is an open between the two. You indicated there was corrosion when you got the parts. Check to see if anything is preventing power from going out the fuse and into the wiring.

Joe
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Wednesday, April 8th, 2020 AT 6:24 PM
Tiny
CTORRES
  • MEMBER
  • 59 POSTS
Joe hi. The old parts had corrosion and I had problem with some lights (tail light, license plate light, highlights, position light, dome light and panel light in my car.
Now I have a new junction block and ECU and are good all lights. Now I have just a problem with DRL.

Thanks.
CTORRES.
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Thursday, April 9th, 2020 AT 11:56 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hello my friend. I need clarification. You have power in and out at the fuse, but nothing goes to the blue wires. Is that correct? If it is, I'm lost because if power is out of the fuse but is not at the wires, then where is it going? Power from the ECU should exist if it gets power from the fuse. If you unplug the connector, is there power at the pins on the ECU? If there isn't, I think you got another bad ECU. The DRL show be powered all the time.

Let me know.

Joe
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Thursday, April 9th, 2020 AT 4:22 PM
Tiny
CTORRES
  • MEMBER
  • 59 POSTS
Hi Joe, I have good news yesterday and today I have bee working with the lights and performed for second time that links you sent me and I founded a plug open (I don’t know how to say in English) after that if you want to use the DRL on Toyota Corolla 2016 you need to follow some condition in the car.
1. Take available in your radio “lights settings, daytime running lights on”.
2. The transmission out of P.
3. Brake handle off.

Thanks so much for help me again.

Take care.
Ctorres.
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Saturday, April 11th, 2020 AT 3:13 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Excellent job! You are very welcome. You did a lot of work on this vehicle. Regardless, you fixed it.

I'm happy to hear it's working for you. Please feel free to come back if you have any questions in the future.

You take care, stay healthy, and I wish you and your family a Happy Easter.

Joe
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Saturday, April 11th, 2020 AT 10:48 PM

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