E-Brake light wont go out.

[GuardianLlama]

ok so the brake light won't go out on the dash of my 1990 hatch. fluid is to the top and the light goes on and off as i apply the ebrake when the car is not running. but as soon as i start the car the light goes on. battery light also lights up dim. turbo timer reads 13.7v constantly

z32 front calipers, booster and BMC

some ideas?

[kevmeistah21]

on your ebrake hand theres a switch towards the end, remove your center console to get a better point of view. The switch is towards the bottom of the ebrake and when you put the ebrake down it causes the switch to deactivate turning off the light and when you pull the ebrake up it causes the switch to activate turning on the light.

[GuardianLlama]

as i said above the light functions perfectly while the car is not running. not really sure how this could solve my problem

[kevmeistah21]

ohh lol i misread the first post. sorry idk whats going on then.

[BoostedCoupe]

check the brake fluid. the light stays on when it is low.

[rexify]

Its your charging system. With both those lights on it means the alternator isnt charging correctly. Have the alt checked out.

[GuardianLlama]

Originally Posted by BoostedCoupe

check the brake fluid. the light stays on when it is low.

BMC is full.... also as stated above.

Originally Posted by rexify

Its your charging system. With both those lights on it means the alternator isnt charging correctly. Have the alt checked out.

damn even if my turbo timer is reading 13.7v???

[rexify]

Originally Posted by GuardianLlama

damn even if my turbo timer is reading 13.7v???

Yeah. my SAFC II was reading normal voltage too. My alternator belt was loose and wasnt charging that well. Once I tightened the belt everything was good again. See if your belt is tight first.

alternator has nothing to do with the brake warning light circuit.

alternator charge light has its own circuit.



the brake light works with ether the ebrake switch OR the bmc reservoir level switch.

[rexify]

Originally Posted by ixfxi

alternator has nothing to do with the brake warning light circuit.

alternator charge light has its own circuit.



the brake light works with ether the ebrake switch OR the bmc reservoir level switch.

The brake and battery light combo is a code nissan uses for telling you battery isnt charging correctly. ITs been covered.

[slothonaleash]

Is there any update on this?

My brake light comes on randomly while I'm driving then goes out. My BMC's full, and my alternator/battery are only a month or two old.

[Odysseus]

^Ditto...Its annoying to see my light come and go.

[ANVIL]

mine is on also. i tried quickly to address it but havent given it much thought until i finish my q45 calliper upgrade.

but what i did notice is.... if i pull up the ebrake the brake light gets brighter, and put it down it gets dimmer but still on. if i unplug the sensor on the bmc the light goes out, and if i use the ebrake, it lights on and off normally. the float isnt stuck and i drained/flushed out the bmc and it was still on. when i do my brake work (Q45 calipers/pads/rotors and ss lines up front, rebuilt s13 calipers in the R w ss lines) i will be doing a full flush and then going from there to address the light.

if anyone knows what could be up with mine id appreciate some suggestions

Originally Posted by rexify

The brake and battery light combo is a code nissan uses for telling you battery isnt charging correctly. ITs been covered.

Bullshit.

Those circuits dont even go into the ECU. The alternator (battery charge) light signal comes straight from the alternator, the low brake fluid/ebrake signal goes directly to the hand brake and the BMC.

What else, Chun Li throws her bracelets too right?

[s14driver]

Alternator. I had the same issue

[ANVIL]

my alternator has less than 2k miles on it, freshly rebuilt

[clark]

you have a weak ass connection to your alternator.

you sure you have a plastic or other non metal washer separating the positive source to the alternator?

do you have a buzzing noise coming from the fuse panel near your left leg?

[DreamN]

Originally Posted by ixfxi

Bullshit.

Those circuits dont even go into the ECU. The alternator (battery charge) light signal comes straight from the alternator, the low brake fluid/ebrake signal goes directly to the hand brake and the BMC.

What else, Chun Li throws her bracelets too right?

Mike, it's actually true. Search the subject, it's been talked about and confirmed. Hell, I even experienced it when I first bought my S13. Had an incredibly worn belt and once the car was on both the brake light and the battery light would come on simultaneously. Changed the alternator belt and all was perfect in the world.

[janders211]

What else could cause this brake light + Battery light Combo?

I had it on my alternator when it was dying (<12.5). I replaced the alternator and it was fine (~13.3v)- and it worked for a while.
I left the car out in a hard rain and now I'm getting high overvoltage (15v, that sometimes drops to 13v) and I get both lights. It is overcharging- outside of the alternator what could do this...i.e. where else is there voltage regulation?

Originally Posted by DreamN

Mike, it's actually true. Search the subject, it's been talked about and confirmed. Hell, I even experienced it when I first bought my S13. Had an incredibly worn belt and once the car was on both the brake light and the battery light would come on simultaneously. Changed the alternator belt and all was perfect in the world.

considering that ive taken apart the ENTIRE wiring harness of my 1990 S13 240SX and my 1998 S13 180SX, i will say that 100% there is no fucking combo code.


i took apart and traced each and every wire, and i can specifically tell you that the brake light circuit is completely separate from the alternator charge circuit, and none of them go through an ecu or anthing advanced enough to throw a combo code.


there is only ONE person on this forum that i would even remotely consider listening to when it comes to wiring, and that would be russ. he is the only one who truly knows the car as inside and out as i do when it comes to wiring and such.


so no, there is no combo code.

[janders211]

Originally Posted by ixfxi

considering that ive taken apart the ENTIRE wiring harness of my 1990 S13 240SX and my 1998 S13 180SX, i will say that 100% there is no fucking combo code.


i took apart and traced each and every wire, and i can specifically tell you that the brake light circuit is completely separate from the alternator charge circuit, and none of them go through an ecu or anthing advanced enough to throw a combo code.


there is only ONE person on this forum that i would even remotely consider listening to when it comes to wiring, and that would be russ. he is the only one who truly knows the car as inside and out as i do when it comes to wiring and such.


so no, there is no combo code.

When I unplug the power wire (the one that switches it on) to the alternator it pops on the brake light. There has to be some sort of connection for this to happen-although I'm not saying it is ECU controlled. Also, too low, and too high voltage coming from the alternator pop on the brake light...not sure why- but it happens.

[Ragnarok043]

ditto it has happened to me before too, the brake light turned on when my alternator went bad.

[DreamN]

Originally Posted by ixfxi

considering that ive taken apart the ENTIRE wiring harness of my 1990 S13 240SX and my 1998 S13 180SX, i will say that 100% there is no fucking combo code.


i took apart and traced each and every wire, and i can specifically tell you that the brake light circuit is completely separate from the alternator charge circuit, and none of them go through an ecu or anthing advanced enough to throw a combo code.


there is only ONE person on this forum that i would even remotely consider listening to when it comes to wiring, and that would be russ. he is the only one who truly knows the car as inside and out as i do when it comes to wiring and such.


so no, there is no combo code.

You never bothered to look at the FSM?

91-94 FSM EL-46 Last portion of it you see the connection, bulb check relay.

[rokmplutonium]

Originally Posted by rexify

Its your charging system. With both those lights on it means the alternator isnt charging correctly. Have the alt checked out.

I had the same symptoms, turns out my alt. was going bad.
It took several months for my alternator to finally die. After my alt. was changed out, the lights turned off.

[GuardianLlama]

crazy. while the car is running with a voltmeter on the battery its reading 14v wouldnt that show the it isn't my alt. going bad?

[clark]

Originally Posted by GuardianLlama

crazy. while the car is running with a voltmeter on the battery its reading 14v wouldnt that show the it isn't my alt. going bad?

did you check my previous post?

i had the same problem, i had a loose alternator connection and the posi terminal was grounding out as well.

get a plastic washer, clean the alternator connections.

[blackej7]

crazy nissan. (this is for 89')

[Solidus311]

Originally Posted by BoostedCoupe

check the brake fluid. the light stays on when it is low.

Oh wow, I guess that explains why my light stayed on all the time. I had a leak in one of my calipers and constantly had to replace the brake fluid before finally replacing the caliper itself. I thought my ebrake sensor was faulty.

[GuardianLlama]

Originally Posted by clark

you have a weak ass connection to your alternator.

you sure you have a plastic or other non metal washer separating the positive source to the alternator?

do you have a buzzing noise coming from the fuse panel near your left leg?

no buzzing noise and alt connection was cleaned

Originally Posted by clark

did you check my previous post?

i had the same problem, i had a loose alternator connection and the posi terminal was grounding out as well.

get a plastic washer, clean the alternator connections.

alt connection checked. and i don't think posi is grounding out.

plastic washer? where? positive source on the alt?

[240Zfunahollic]

i know this is old... but check the 10 amp eng cont fuse next to the battery... That causes the combo light ive blown that a few times...