Electrical problem with headlights

Tiny
VINTSHAVE
  • MEMBER
  • 2004 TOYOTA HIGHLANDER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 154,000 MILES
Tonight I parked my car. The headlights were on auto as usual. When I came back to my car about two hours later, I noticed the following:

1) Headlights were on. Running lights were on.
2) I checked the position of the headlight switch. It was still in auto mode.
3) I had to turn the headlight switch to "off" for the headlights and running lights to go out.
4) There was not enough battery power left to start the car.

I left the car alone for about an hour. Enough juice returned to the battery to start it. I drove it for about 20 minutes with no issues. When I got home, I performed some additional tests:

1) I put the headlights back on AUTO. They did not go out when I turned the car off and locked it. I had to turn the lights off manually.
2) When the car is running, the car will lock and unlock from the driver's side electric switch. When the car is OFF, the same switch will only LOCK the car. To unlock it without the engine running, I had to manually unlock the door.

Based on this information, what do you think is going on?

Thanks in advance!

John
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Tuesday, May 14th, 2019 AT 8:53 PM

5 Replies

Tiny
VINTSHAVE
  • MEMBER
Load tested the battery this morning. It passed. It seems that the battery is good.
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Wednesday, May 15th, 2019 AT 2:57 PM
Tiny
VINTSHAVE
  • MEMBER
Tested the alternator. It puts out 13.7 volts.
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Wednesday, May 15th, 2019 AT 4:06 PM
Tiny
SCGRANTURISMO
  • EXPERT
Hello,

This could be a problem with tour vehicle's Automatic Light Control Sensor which is located on the left side of the dash. This is the sensor that controls your Daytime Running Lighting System. I have included in the diagrams down below the factory diagnostic tests for your vehicle 's Daytime Running Light Sensor. Please go through the guide and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Wednesday, May 15th, 2019 AT 10:21 PM
Tiny
VINTSHAVE
  • MEMBER
Do I need to wait until the symptoms recur before doing these tests?
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Thursday, May 16th, 2019 AT 8:30 PM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

Are your vehicle's headlights working properly again?

Thanks,
Alex
2CarPros
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Thursday, May 16th, 2019 AT 8:51 PM

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