Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Headlights Don't Turn on (Out at the Same Time)

ShadowReaper · 10-05-2020, 11:26 PM

What I have checked already (All Good):
- Fuses for Low/High Beam (Check w/ Multimeter (Ohms) and Visually inspected)
- Relay for Headlights (Makes Clicking sound and Switch them with the fog lights)
- Battery Voltage
- Light Bulbs (HIDs) (They have a very small cloud inside but it's not big enough to indicate that it's blown. Auto Zone and NAPA agree)
- Alternate 105 Amp Fuse (Visually)

Previous Modification:
-I recently blacked out the inside of the headlight housing. I had zero issues after, as I checked all lights right after install and they all turned on.

Previous Problems:
- I had a moderate amount of corrosion on the Negative terminal of the battery and the terminal end.

With that being said, questions:
- Could a bad terminal be the reason why my headlights don't turn on? I cleaned 95% of the corrosion off with a wire wheel. Could some corrosion in that module that's part of the terminal end be the problem?

- Could it be a reverse polarity issue? I'm sure with how modern the BRZ is, there is reverse-polarity protection but I also know that it isn't always 100% effective. I have noticed NAV system gets no signal, at least when I'm in the garage haven't checked outside of that. Also, key-less entry has failed about 3 times in the last month.
EDIT: Key-less entry and NAV system are fine, I was just paranoid

Haven't Checked:

Ballast - I really doubt it would be a ballast because they went out at the same time, also didn't notice any damage inside.

Wiring Harness - I do not notice any damage to the wiring harness, I will probably have a mechanic test this at that point.
EDIT: It appears I am getting voltage to the headlight connectors, wiring up to that point is fine.

Headlight Switch - Really doubt this would be the problem, all the other features work fine.

I'm literally about to give in and get an electrical diagnostic. If I end up ordering the new Battery Terminal end w/ module, that may be my last straw. As I don't know how to deal or check with reverse polarity.

(FINAL EDIT) PROBLEM SOLVED: The problem was a loose connector from the headlight wiring into the Ballast.

10-05-2020, 11:26 PM	#1
ShadowReaper Indulgent Tormenter Join Date: Dec 2015 Drives: 15' LTD Subaru BRZ DGM Location: FL Posts: 495 Thanks: 334 Thanked 129 Times in 88 Posts Mentioned: 4 Post(s) Tagged: 2 Thread(s)	Headlights Don't Turn on (Out at the Same Time) What I have checked already (All Good): - Fuses for Low/High Beam (Check w/ Multimeter (Ohms) and Visually inspected) - Relay for Headlights (Makes Clicking sound and Switch them with the fog lights) - Battery Voltage - Light Bulbs (HIDs) (They have a very small cloud inside but it's not big enough to indicate that it's blown. Auto Zone and NAPA agree) - Alternate 105 Amp Fuse (Visually) Previous Modification: -I recently blacked out the inside of the headlight housing. I had zero issues after, as I checked all lights right after install and they all turned on. Previous Problems: - I had a moderate amount of corrosion on the Negative terminal of the battery and the terminal end. With that being said, questions: - Could a bad terminal be the reason why my headlights don't turn on? I cleaned 95% of the corrosion off with a wire wheel. Could some corrosion in that module that's part of the terminal end be the problem? - Could it be a reverse polarity issue? I'm sure with how modern the BRZ is, there is reverse-polarity protection but I also know that it isn't always 100% effective. I have noticed NAV system gets no signal, at least when I'm in the garage haven't checked outside of that. Also, key-less entry has failed about 3 times in the last month. EDIT: Key-less entry and NAV system are fine, I was just paranoid Haven't Checked: Ballast - I really doubt it would be a ballast because they went out at the same time, also didn't notice any damage inside. Wiring Harness - I do not notice any damage to the wiring harness, I will probably have a mechanic test this at that point. EDIT: It appears I am getting voltage to the headlight connectors, wiring up to that point is fine. Headlight Switch - Really doubt this would be the problem, all the other features work fine. I'm literally about to give in and get an electrical diagnostic. If I end up ordering the new Battery Terminal end w/ module, that may be my last straw. As I don't know how to deal or check with reverse polarity. (FINAL EDIT) PROBLEM SOLVED: The problem was a loose connector from the headlight wiring into the Ballast. __________________ Instagram: Gabe.it.the.ole.college.try Last edited by ShadowReaper; 10-11-2020 at 12:15 AM.