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12-05-2021, 10:06 AM | #1 |
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High beams not working
I don't drive my Z4MR that much anymore, but I have noticed at night my high beams have stopped working for awhile now. I replaced both left and right bulbs with factory bulbs this summer and the low beam is working just fine. When I try to turn on the high beam I get a flash, then it just goes back to low beam on both sides. Maybe it'll stay on for a second, but I can't get them to stay on. Do I need to replace the ignition elements (63126907489) or the control unit (63126907488)?
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12-05-2021, 06:19 PM | #3 | |
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Like @maupineda said, are you sure you're pushing the lever forward to turn the high beams on? |
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12-06-2021, 04:36 PM | #5 | |
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The thing is, the high beams will work when the car is first started, but after driving for a little while, maybe 15-20 minutes, the high beams just stop working.
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12-06-2021, 08:31 PM | #6 |
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Sorry, had to ask about the high beam switch position, you never said they work correctly for the first 15 minutes of the ride, that data point would have eliminated asking about the push position of the switch.
Anyway, it could either be the headlight switch (LSZ), it's a computer in itself, or the high beam switch. I'd say more likely the LSZ. If you pull the switch and hold it (flash to pass) do they stay on? Is the headlight switch in the auto mode during your testing? If not, try using it in the manual "on" position to eliminate the auto mode causing the issue. If it were mine: I'd use NCSexpert to rewrite the coding to the LSZ just in case any of the coding got wonky. If that didn't work, I'd look at the voltage on pin 2 & 36 of the light switch when switching the high beams on and see what it's doing. If you get 12v then the problem is downstream. Here's the schematic for the Bi-Xenon circuit, it's really pretty simple, all the complicated stuff is inside the LSZ. |
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12-07-2021, 06:00 PM | #7 | |
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12-09-2021, 05:10 PM | #8 |
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Have you tried pulling codes? As previously stated, the LSZ switch might have issues.
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12-15-2021, 03:36 PM | #9 | |
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Anyways when it happened it was the end of the driving season so I didnt really spend time diagnosing it. Car sat over the winter and funny enough didnt have the issue at all this year.
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12-18-2021, 09:11 AM | #10 |
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Took the car out the other night and couldn't get the issue to come up again. Tried with the headlight switch on Auto and On, and both pulling and pushing the stalk. I wasn't out for a long drive though, maybe 10-15 minutes.
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12-18-2021, 12:26 PM | #11 | |
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If I had to guess, I'd say there's a marginal transistor within the LSZ that over time and or with heat fails to send 12v to the Bi-Xenon high beam shutter solenoids. Hopefully it continues to work properly for you. |
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