Hi,
My new to me 89 635csi has a problem I'd like to solve , if the battery is connected then the Low Beam headlights turn ON and stay on.
This works even without the Key being in the ignition at all, so obviously this is an issue
Any recommends on where to loo first on what would cause this? I haven't gotten a Bentley and ETM manual for this car yet, so wondering if there is anything I could quickly look at to see if it's an easy fix perhaps a relay or is there a Light module like in the E32/E34 cars?
Thank you in advance!
e30 84 340i m6x powered.
e34 89 535i 5speed - current DD
e24 89 635csi - maybe a DD?
e34 93 525i (m50tu) - gone
e39 540i 6spd m-sport - gone
e53 x5 4.4l - gone
e30 89 325i (m20) - gone
Pull relay K4 in the fusebox and see what happens. It's a relay that's used in several different locations, so pull one of the other matching relays, insert it where K4 was, and see if the lowbeams work normally.
Dean
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
Yep, will do that . Is the power supplied to the relay even when the key is not in the ignition ?
Posted twice, sorry 'bout that.
Last edited by 1986series6; 11-19-2017 at 11:38 AM.
Here is the ETM for an 89. Pages 6312-0 & 6312-1, have the schematic for the headlight circuit.
http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf
Thank you.
Pulled the headlight relay and the lights turned off (good).
Pulled another relay of the same kind and installed Into k4 spot and lights turned back on without key in ignition and headlight switch on (bad)
My '85 Euro is similar. The headlights won't stay on, but the city lights and rear lights do with the key off. I do it all the time, but the LEDs don't draw many amps, and I have yet to kill the battery, even overnight. I need to install a buzzer, too.
Dean
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
That's strange ! Shouldn't you be able to turn the lights off though ?
The problem is the lights stay on even the headlight switch is in off position ...as long as the battery is connected the lights are automatically On if the relay is in place .
Do your fog lights turn on when your low beams are on when they are not supposed to be on?
The K4 relay has power available whenever the ign switch is in RUN or Start position, basically anytime the ign switch is not in the off position, but you still need a ground to pull the relay, and that comes from the light switch. Either you have a short to ground between the light switch and the K4 relay or your light switch is is always on ...evn though you think it is off.
'88 635, '92 325IC
Jody,
I looked at the schematic for the lights. Can't figure out why the headlights stay on with ignition switch off.
Also--I didn't forget about detail. My buffer pad was dried out. I finally have a new pad installed.
If there's a really nice day coming up on a weekend, I'll call you if your available. If not, we'll do it first nice day in the spring.
Happy Thankgiving
Bob V
At this point, it sounds like the switch might be shorted to ground. I'd take it out, test it with a meter, and spray it with copious amounts of contact cleaner. If that fails, check the wiring and/or substitute another switch into the circuit.
Dean
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
Fogs don't turn on with headlights , just the low beams do this.
I'll pull the headlight switch out next and hope that turns the lights off when the relay is present .
These are 5 pin relays , can one from newer chassis be used like e34?
I'm not sure if you solved this one yet, but I think both headlight circuits use unique relays in the late-model cars. Low-beams have a 5-pin normally off relay. The high beam uses a 'flip-flop' 5-pin instead, one leg is always switched on. If the relays were accidentally swapped, the low beams will always be on regardless of the headlight or ignition switch positions. The headlight switch only grounds the control side of the relays.
Last edited by DesktopDave; 12-08-2017 at 10:25 PM.
See if your high beams or fog lights will come on with the light switch off. If not your switch is probably good. Can you feel the relay clicking when you remove and install it? Check pins 30 and 87 for continuity. They should be open. If closed get new relay. Check pins 85&86 for voltage in relay base. If you have voltage then 85 is grounded. If no voltage. Check pin 87 for voltage to ground. Should be none there
Last edited by bmw6fan; 12-10-2017 at 02:57 PM.
30 to 87 is open . Will check pins 85 and 86 for voltage tomorrow .
Hi,
So I am revisiting the issue and just spent some time trying to resolve it and wasn't able to.
Here is what I've done to get this out of the way. High beam and low beam relays are 12v 20/30A 0332 204 401 5pin relays.
I've tried swapping them around and it made no difference.
CAR OFF, KEY OFF
If the relay is present then Low beam lights turn ON.
When I pull the relay and check for voltage on any of the pins in the fusebox socket I am seeing 12 volts on pin 30.
This is present on both High and Low beam sockets.
I went ahead and removed the headlight switch and tried another switch, no difference.
I also tried disconnecting the headlight switch completely, that made no difference either.
So, then I tried the following combinations.
Car is OFF, but Key is in the Accessories position and Headlight switch is OFF.
Votlage is present on both highbeam and low beam relay sockets on pins 30 and 87.
Car is OFF, key is in accessories position but now with the headlight switch ON
Voltage is ONLY present on pins 30, for both high beam and low beam relays.
Now, Car is ON and Headlight switch if OFF. If relay is present then Low beams turn ON.
Interestingly I don't see ANY voltage in any of the PINS in highbeam nor lowbeam sockets?!
Car is ON, Switch is ON
Turning High Beam switch ON, brings 12volts to pin 30 on the high beam relay.
e30 84 340i m6x powered.
e34 89 535i 5speed - current DD
e24 89 635csi - maybe a DD?
e34 93 525i (m50tu) - gone
e39 540i 6spd m-sport - gone
e53 x5 4.4l - gone
e30 89 325i (m20) - gone
Anyone?
e30 84 340i m6x powered.
e34 89 535i 5speed - current DD
e24 89 635csi - maybe a DD?
e34 93 525i (m50tu) - gone
e39 540i 6spd m-sport - gone
e53 x5 4.4l - gone
e30 89 325i (m20) - gone
Pin 30 should be on at all times. Pin 87 should not be on unless relay is energized. I would concentrate on finding out where that power is coming from with the key off. Fuses 1,2,13,14 should kill the lights. I'd start pulling other fuses to see if that voltage is coming from somewhere else
I am afraid maybe there is some wiring issue/problem within the fuse/relay box. Pulling all the fuses 1,2,13,14 does not turn both low beams off, only turns ONE of them off when the key is not in ignition.
To confirm, pin 30 should be ON even with key off ?
e30 84 340i m6x powered.
e34 89 535i 5speed - current DD
e24 89 635csi - maybe a DD?
e34 93 525i (m50tu) - gone
e39 540i 6spd m-sport - gone
e53 x5 4.4l - gone
e30 89 325i (m20) - gone
To confirm, pin 30 should be ON even with key off
Yes.Screenshot_2018-04-06-17-09-32.png
Screenshot_2018-04-06-17-09-32.png
Try unplugging that active check control unit
Last edited by bmw6fan; 04-06-2018 at 05:16 PM.
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