[laww79]

Hi,

I have a 2012 honda Civic EX. I was driving along and within 100 metres all the following lights came on.

Engine Management Light
ABS light
Tyre Pressure Light (which flashed for a while before remaining constant)
Electric Steering wheel light.

I took it to a garage and they diagnosed that it was the Brake Pedal sensor. This was replaced which solved the problem until today where the same thing happened.

Does anyone know what is causing this? Looking at google and other Honda Threads it has been suggested it could be an ABS Sensor.

Could it also be that the battery is failing and due for a replace?

I also have another intermitent issue where the car thinks the boot is open. Sometimes it never goes off whilst other times it goes off constantly. This has meant I have to lock the car by key as it thinks a door is open.

I am not sure if these two issues are linked.

Looks like I have electric gremlins. alm:

 

[Dave O]

Error Code P0504

Hi laww79

I have a 62 plate 2.2 diesel and have the same problem with the 4 warning lights.
Did you ever resolve the issue?

Cheers
Dave

 

[kevdj1]

I had this exact same problem on a 62 plate EX First i had engine management light and connected the computer gave code P0504 (BRAKE PEDAL SWITCH) then shortly after ABS Light, Electric Steering Wheel and Flashing Tyre Pressure Horseshoe.
Here is how i fixed it:


First press the Brake Pedal a few times and if the brake lights work its not the Brake Switch don't even waste your time taking it out, its just a switch there is no circuitry in there (and Honda charge near £60 for a new one!!)


The next thing i did was check all the fuses with a multi meter but if everything is working in the car i would skip this.


Just go straight to dropping the back seats and get in the back look at the ceiling either side by the boot at the top by the ceiling airbags if its wet or water stained that is the issue.
remove the side plastics start with the drivers side cos this is the problem area pull the rubbers and get the plastics off be careful with the top grey plastic it pulls downwards but the airbag is above it, just rock it back and forth and it will come off .
you are then greeted with 4 or 5 white plastic wiring plugs all soaking wet!! i disconnected them all blew all the water out sprayed WD40 inside them then dried with hairdryer. I was thinking about removing the plugs and soldering each wire and insulating but its a bit of work too do that.
anyway once its all dry plug it all back together then i got some plastic bags like food bags wrapped around the wires at the top of each plug and secured with a cable tie then duck tapped over it and left the bag open at the bottom about an inch past the plug.
so basically waterproof each plug but leave the bottom open so it doesn't condensate, do all the plugs even the yellow airbag ones just pop the clip off the body, i didn't clip them back just cable tied together as the water comes down the bodywork.
do the passenger side too not much over there just some DENSO stuff and the airbag but cover them too.


Now i still haven't managed too find out where the water is coming in but i've just bought some STICK LIKE SH1T CLEAR from Screwfix so i'm gonna seal the fook out of everything around that area and hopefully it will keep the water out.


put it all back together turn the engine on and tap the brake a few times and all the lights should disappear.


happy days


mine started with the alarm going off random at first so that must of been the start of the water getting in those plugs just glad its not Gremlins

 

[Masdan96]

I had this exact same problem on a 62 plate EX First i had engine management light and connected the computer gave code P0504 (BRAKE PEDAL SWITCH) then shortly after ABS Light, Electric Steering Wheel and Flashing Tyre Pressure Horseshoe.
Here is how i fixed it:


First press the Brake Pedal a few times and if the brake lights work its not the Brake Switch don't even waste your time taking it out, its just a switch there is no circuitry in there (and Honda charge near £60 for a new one!!)


The next thing i did was check all the fuses with a multi meter but if everything is working in the car i would skip this.


Just go straight to dropping the back seats and get in the back look at the ceiling either side by the boot at the top by the ceiling airbags if its wet or water stained that is the issue.
remove the side plastics start with the drivers side cos this is the problem area pull the rubbers and get the plastics off be careful with the top grey plastic it pulls downwards but the airbag is above it, just rock it back and forth and it will come off .
you are then greeted with 4 or 5 white plastic wiring plugs all soaking wet!! i disconnected them all blew all the water out sprayed WD40 inside them then dried with hairdryer. I was thinking about removing the plugs and soldering each wire and insulating but its a bit of work too do that.
anyway once its all dry plug it all back together then i got some plastic bags like food bags wrapped around the wires at the top of each plug and secured with a cable tie then duck tapped over it and left the bag open at the bottom about an inch past the plug.
so basically waterproof each plug but leave the bottom open so it doesn't condensate, do all the plugs even the yellow airbag ones just pop the clip off the body, i didn't clip them back just cable tied together as the water comes down the bodywork.
do the passenger side too not much over there just some DENSO stuff and the airbag but cover them too.


Now i still haven't managed too find out where the water is coming in but i've just bought some STICK LIKE SH1T CLEAR from Screwfix so i'm gonna seal the fook out of everything around that area and hopefully it will keep the water out.


put it all back together turn the engine on and tap the brake a few times and all the lights should disappear.


happy days


mine started with the alarm going off random at first so that must of been the start of the water getting in those plugs just glad its not Gremlins

My Car - 2.2 CDTi 2012 Plate
All fuses correct
Brake lights working normally

Kev, I have what I consider to be exactly the same problem(s). It all started off with the rear centre brake light warning (not boot open), then in quick succession after a mile or so, Engine Management Light with VSA, Power Steering and Tyre Inflation warnings. Even stranger is the door ajar warning light is on constantly when parked or driving but drops off when I press the brake pedal. The P0504 code can be cleared when the brake pedal is kept depressed, but comes back immediately when released. I have no loss of systems or performance. Vehicle will not lock with the fault logged.

I have located the brake pedal switch and it still operates on the little plunger. I have a replacement switch on order but I’m getting the impression that this won’t solve the problem. I’m leaning towards some H20 (water) gremlins somewhere in the system, although I have stripped back most of the internal plastics to check for moisture. I had the same problem previously (very briefly before it magically rectified itself) and if my memory serves me right it was very rainy both occasions when the fault presented itself. Could this maybe be a possibility?

 

[Anik Finland]

Having the same problems as described, what should I do? I don't want to take it to dealers as they will charge me a fortune. How you guys solve it?
My car is Honda civic 2013 1.6L diesel.

 

[Masdan96]

Having the same problems as described, what should I do? I don't want to take it to dealers as they will charge me a fortune. How you guys solve it?
My car is Honda civic 2013 1.6L diesel.

Anik,

Not sure if this will help, I had the problem as above. I never did get it rectified, though I did have it diagnosed by a Honda dealership. It was ‘suspected’ that the fault lay in the wiring harness from the rear pillar into the boot lid and all of its parts (boot lock etc). I believe the part was in the region of £80 to purchase to fit yourself.
There must’ve been a snapped wire in the harness as a simple continuity check showed one open circuit. This break was probably caused by constant movement/opening of the boot lid.

you could try to identify if there is a break or open circuit and bridge it?

It was time to Part Ex, so I got rid, but the new owner soon had the fault repaired (I presume with a new wiring harness or a simple repair).

Best of luck

 

[Anik Finland]

Hi
Thanks for the help. I don't know how but the problems went away automatically!! I am assuming it was due to very cold weather, maybe some moisture on the sensors. Hoping that it won't appear soon. What about you guys? Did anyone diagnose the actual problem or went away normally??
Thanks in advance!
-Anik SB

 

[Martin SK]

Hello guys,
Im from Slovakia, my EN may be not 100% gramatically correct, but i try to do my best .... So, my Civic .... 1.6 idtec, 2013, 9.gen before facelift.

I had the same problem. Out of nothing, the error occured on display -> rear tailgate opened. But of course, was closed. The same issues as laww79, kevdj1, Masdan96 have described. First happend last year, i have replaced brake pedal switch, and it disappeared (anyway, my original seitch from OEM was a bit broken where it clips with male cable plug, but didnt influence positioning). So i guessed .. great, problem solved. Last week appeared again. Replaced the switch, but still the problem occurs, simply this change didnt help. Before, when i had this problem, i tried to push on brake pedal (simulating braking), and it led to closed state indication (simply, problem disappeared). But as i released brake pedal, opened tailagate ashown again (even if closed). Sometimes this opened-tailgate-error comes on and off when i drive on uneven road or aome bumpers - ao it MUST be some electrical (connection) or really small-part-mechanical problem.
I tried to follow your instructions, so:

• fuses ok
• brake bulbs ok
• i tried to get off the plastic covers on the sides of luggage space (where seat belt is mounted by hex nut, and where head airbag is located). Did get it off completely as i didnt want to dismount the hex nut (because of safety). But i tried to get if off as much as possible, checked with flashlight, but everything totally dry (of course, moisture may be there, but nothing really visible).
• i tried to get off the plastic covers (black) from whole tailgate from inner side (pain to make it without breakage of clips), all dry. I had closer look, if i can find any water indication, and i found a bit of dirt (like as dirty water gets evaporated and you have only some dust marks) on two white connectors mounted directly on the hood (two bigger white connectors bundled/clipped together in one big piece, see picture). So there may be some leakage and water intrusion into the connectors. I tried to unplug them from hood, separate them, and then disconnect. Result: indication of tailgate opened or closed state disappeared (no energy, no signal),but also my middle brake light didnt work (no signal.......other brake light worked - probably different wiring). All these happend with engine on.

-with angine in, i tried to open tailgate, and while opened, i manually closed the tailgate latch. Result: display showed stilll "opened tailgate". Ao i tried to disassemble the latch (to separate black metal part from white plastic, fixed by 3 screws i guess). In the black metal part there is a microswitch. This switch has a tiny thin metal sheet within, which indicated (i guess, as i understand how latch works) the state of tailgate (opened or closed). I tried to "bend" a bit this metal thin sheet, to adjust a bit the microswitch positions. Mounted whole assembled latch back to tailgate, but without change.

My plan is to have a car wash (heavy car wash), without inner plastoca mounted on tailgate, and see if i catfh some water leakage. This problem was described also on aome other slovak-czech forum, they found leakages, and also plug connector leakage, so they bridged it. But its hard to brudge some cable, if you dont know which cable it is (somewhere between brake pedal and tailgate ) ..... What may worth tk check is the handle-point, where you open the tailgate (above licence plate).but if this would be false, it would physically open the tailgate, and our tailgates are closed, and thats when we have a problem..so i keep you updated. In case you have anything new,please keep it here updated.

Martin