low voltage headlight and foglight
low voltage headlight and foglight
I'm trying to put aftermarket HID lights on my 2015 rogue but the passenger side low beam and fog light are showing low voltage which is preventing the HID from working.. Has anyone run into this problem??
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VStar650CL
- Technical Expert
- Posts: 11931
- Joined: Thu Nov 12, 2020 1:25 pm
- Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S
Re: low voltage headlight and foglight
Low voltage means high resistance, so you need to find out which side of the circuit your low voltage is coming from. Refer to EXL-28 (Halogen Headlight) and EXL-49 (Fog Lamp):
https://www.nicoclub.com/service-manual ... %2Fexl.pdf
You can see that the two circuits don't have much in common besides the ground (E9) and wire-to-wire connector E201:E40, which connects the Engine Room Harness to the Front End Module Harness at the Fuse and Relay Box. So the first thing to do is back-probe one of the lamp connector pins with a good ground jumped from battery negative. If the lights get bright then you know the problem is a poor ground connection and you can trace it back to the source using voltage drop. You can find the harness layouts and ground locations in the PG section, on PG-46, 49 and 37 respectively:
https://www.nicoclub.com/service-manual ... 5%2Fpg.pdf
You can see on PG-37 that E9 and E201:E40 ground virtually everything in the righthand front lighting system, plus both fog lamps. So which other lamps are affected can give you immediate clues about where the problem lies.
https://www.nicoclub.com/service-manual ... %2Fexl.pdf
You can see that the two circuits don't have much in common besides the ground (E9) and wire-to-wire connector E201:E40, which connects the Engine Room Harness to the Front End Module Harness at the Fuse and Relay Box. So the first thing to do is back-probe one of the lamp connector pins with a good ground jumped from battery negative. If the lights get bright then you know the problem is a poor ground connection and you can trace it back to the source using voltage drop. You can find the harness layouts and ground locations in the PG section, on PG-46, 49 and 37 respectively:
https://www.nicoclub.com/service-manual ... 5%2Fpg.pdf
You can see on PG-37 that E9 and E201:E40 ground virtually everything in the righthand front lighting system, plus both fog lamps. So which other lamps are affected can give you immediate clues about where the problem lies.
Re: low voltage headlight and foglight
thanks, i'll jump into that hopefully this weekend..