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Brake pad sensor fuse
The low pad warning came on in my car. I checked the pads and they are all good. I know that the warning could come on if there is a broken wire, but it is too darn cold to work on the car outside. I am tired of the warning light, is there a fuse for that circuit? If so, which one, and what else is on the circuit.
Thanks, Maynard 2011 XF 5.0 |
Sadly, warnings like that don't really sit behind fuses as such, so you can't just stop the warning by yanking a fuse. The brake pad wear sensor is not integral to the pads on these cars, it is separate and needs to be replaced with them as it wears down (though people often won't). It might be possible to replace it with a resistor of a known value (though I can't help with which value off-hand) but I know if you just disconnect the wear sensor the warning will still show as it will be detected as open-circuit.
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No resistor needed to "false" the system into a normal state, you need to unplug the sensor wire from the chassis harness. Then on the sensor wiring (only 2 wires), cut them leaving about 3 inches from the plug that plugs into the chassis harness and strip back the insulation and twist together, then tape it up and plug it back into the chassis plug.
That will "fool" the check system and remove your warning. When you buy a new sensor and replace your pads, you just unplug and throw away the spliced old sensor wiring and plug in the new one. Is just a basic open/closed circuit. If the circuit is open, it is in alarm, if it is closed, normal. I will try and find the picture i took when i did that a few years ago until I could get new sensors fitted with the new pads. |
oh look I was wrong again lol:)
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Originally Posted by Brutal
No the sensor is a ground circuit. When the pads are worn into the sensor it contact the rotors completing a ground circuit and turning on the light. If the pads are not worn to the sensor then look to see if one of the wires is contacting the wheel inside(most common)
If it was contact with the rotor it would flash on and off each time you use the brake Similarly if you just unplug the sensor wire it will show the low pad warning |
Originally Posted by BritCars
(Post 2035408)
Are you sure about that brutal? It looks like two wires that are connected with a metal loop in the sensor head that you place in the pad. When the head of the sensor wears down and wears through the metal loop it creates an open circuit and gives a warning
If it was contact with the rotor it would flash on and off each time you use the brake Similarly if you just unplug the sensor wire it will show the low pad warning Yep. All you need to do is short out the old wires until you get a new sensor and install it on new pads. I have done it as I replaced my pad before either the front or rear tripped so I did not buy new ones and when I attempted to remove the old ones from the old pads, they broke. So it took a week to get the new sensors in but I needed my car so I cut the old sensor cables up and reconnected for a week. Super simple, I even contemplated leaving them that way until I found the you could get aftermarket ones for $20 a set (Ford uses the same sensors). |
actually no I was assuming that since I have had cars come in with aftermarket brakes and no sensors hooked up that it wasn't looking for the open circuit. According to the workshop manual that is what it looks for. Now why the light is not triggered when there are no sensors...……..?????? :)
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Originally Posted by Brutal
(Post 2035606)
actually no I was assuming that since I have had cars come in with aftermarket brakes and no sensors hooked up that it wasn't looking for the open circuit. According to the workshop manual that is what it looks for. Now why the light is not triggered when there are no sensors...……..?????? :)
Two ways to avoid that without connecting up new sensor(s) - leave the electrical plug connected but cut and join the two wires or get the system disabled via the CCF using SDD. I had the system disabled on both my XFR and F-Type by Cambo. |
Originally Posted by OzXFR
(Post 2035787)
As mentioned before if you simply remove one or both sensors completely you will get the "low brake pads" warning light, as the system is looking for a closed circuit and if you have no circuit that is interpreted by the system as an open circuit = worn through sensor.
Two ways to avoid that without connecting up new sensor(s) - leave the electrical plug connected but cut and join the two wires or get the system disabled via the CCF using SDD. I had the system disabled on both my XFR and F-Type by Cambo. |
Originally Posted by Brutal
(Post 2035803)
Ox I understand what you said earlier. I was referring to why I have had several cars with indie shops that did brakes and did not install sensors and there was no light. And I don't mean indie like Jaguar indie, but like Firestone and Brake check specifically. I will have to try next time I do a set of pads and leave the sensor unplugged from the car and see if that works or not. :)
Up by the plugs so you can't see them without taking the wheels off and looking right up in the wheel wells. |
Originally Posted by ozxfr
(Post 2035807)
all i can think of is that those indie shops cut and joined the sensor wires.
Up by the plugs so you can't see them without taking the wheels off and looking right up in the wheel wells. |
That is strange. I know from mine if you take off the sensor altogether you get an error.
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OK I just verified that yes even unplugged it turns on the warning on the XJ I just did. My thoughts on why the light was not on for the cars that some other shop did brakes on and left the sensors off was that they must have put a small wire in either the front or back of the connectors and I just didn't see them. learned something new that I really didn't have a need to know before. :)
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