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High beam on right works or low beam on left not

Tiny
HEIDIHO
  • MEMBER
  • 2001 NISSAN MAXIMA
  • V6
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
High beam on right works or low beam on left, not one set together, checked fuses, power going to headlamp, swapped out switch on steering column, relay okay. Could it be the smart entrance control unit? Thanks. Heidi
Wednesday, October 16th, 2019 AT 7:03 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

Have you checked the headlamp bulbs? These bulbs have a dual element in them which one can go bad and the other work. Basically, the low beam from the bulb can work and the high beam in the same bulb can fail and opposite.

I attached two pics below from the wiring schematic. Make sure the fuses you checked are the ones I circled in pic 1. They should be fine, but just confirm.

Next, look at pic 2. The wires I circled are the power supply. If you feel the bulbs are good, check for power to those wires. If there is power to all, switch the bulbs from side to side and see if they work the same way. If they do, replace the bulbs.

If there is no power, let me know. 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 or if you have other questions.

Take care,
Joe
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Wednesday, October 16th, 2019 AT 8:05 PM
Tiny
HEIDIHO
  • MEMBER
  • 4 POSTS
Thanks Joe. My mechanic checked power supply and fuses, both okay, he suggested swapping out the switch where the signals and light control is. Did that. Still no good. Will have a look at the bulbs again trade them see what happens. I did buy new bulbs to start when I noticed the headlight out. Possibly I was given wrong bulbs? Any other ideas, much appreciated. What about this "smart entrance control unit"? Says it controls the lights? H.
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Thursday, October 17th, 2019 AT 7:15 AM
Tiny
HEIDIHO
  • MEMBER
  • 4 POSTS
Hey Joe. Just read my car manual. Says to disconnect the negative battery cable before installing lights. Could this be a factor? Lol. Guess I will buy bulbs again and disconnect cable first! H.
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Thursday, October 17th, 2019 AT 3:41 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
If you upload a picture of the bulbs you are using, I will explain how to test them so you don't have to buy new ones. Also, did he check for power at the light sockets? If there was power, the switch isn't bad.

Joe
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Thursday, October 17th, 2019 AT 7:13 PM
Tiny
HEIDIHO
  • MEMBER
  • 4 POSTS
Thanks Joe appreciate your reply, bulbs are fine, power is fine, switch has been replaced, I am going to the pick-n-pull for a smart entrance unit. I did replace the ECM when I bought the car, so possible it is another circuit board failure. I doubt it is an electrical problem or I would have other issues and it makes no sense that I have one high and one low beam! Lol. Any other ideas am all ears! Heidi
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Sunday, October 20th, 2019 AT 9:34 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

Heidi, when you checked for power at the light sockets, was there power when the bulb would have not normally worked? You mentioned there is power, so I'm questioning a ground or socket issue, or maybe I misunderstood. If you are good with wiring schematics, I will upload the entire lighting system for you, so don't be afraid to ask.

Let me know and take care,
Joe
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Sunday, October 20th, 2019 AT 9:31 PM

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