2001 Accord EX brake light on dash

Charlie S said

Huh? A relay is just an on/off switch.


Casey

 

Charlie S said

Huh? A relay is just an on/off switch.


Casey

 

Charlie S said

Huh? A relay is just an on/off switch.


Casey

 

Charlie S said

Huh? A relay is just an on/off switch.


Casey

 

Yesterday I discussed the Brake light that indicates a burned out
Brake Light. Today, I looked for another BRAKE warning light on my 01
Accord EX.....there is one. Look at page 329 in your owner's manual.
The light comes on when you turn your ignition switch on and it stays
on if you do not release the parking brake. If it comes on when
driving it is probably low brake fluid. Low brake fluid means a leak
or worn out brake pads....get it fixed ASAP.

 

It's not a relay Contact in series with each Tail light bulb it's a
relay COIL. A COIL has a voltage drop so I assume 9 volts on the wire
between the relay and the bulb.

This is not new Honda has been doing this for over 10 years.

I remember going in to Kragen's and being told that Honda has
different Brake lights than other brands.

4 of the 5 Brake lights are dual filiment.

I have a '92 Accord wiring diagram in front of me and I can see the
relays.

 

It's not a relay Contact in series with each Tail light bulb it's a
relay COIL. A COIL has a voltage drop so I assume 9 volts on the wire
between the relay and the bulb.

This is not new Honda has been doing this for over 10 years.

I remember going in to Kragen's and being told that Honda has
different Brake lights than other brands.

4 of the 5 Brake lights are dual filiment.

I have a '92 Accord wiring diagram in front of me and I can see the
relays.

 

Not a valid assumption. The effective resistance of the lamp would be around 6
ohms for a 27W stop lamp. I'm sure they've made the relay to be around .5 ohm or
less, so the voltage at the lamp would be closer to 12v in a real-world 12.8 -
13.5 volt world. It'd be interesting if you could actually measure one of the
relays, and/or the voltage across it and/or the lamp(s) in your car.

I believe it.

I believe this too, but I also believe whover told you that is/was full of it.

Immaterial. As I understand so far, the relays are in the brake lamp circuits.
Presence of a tail light or whatever in the same lamp envelope is of no concern.

No doubt. Probably the other responders misunderstood the discussion so far.
Is there a part number for the relay on your car? Maybe I can find the specs.
Googling is good, but in this case I'm either not coming up with the correct
search parameters, or there's just too much stuff...

 

Not a valid assumption. The effective resistance of the lamp would be around 6
ohms for a 27W stop lamp. I'm sure they've made the relay to be around .5 ohm or
less, so the voltage at the lamp would be closer to 12v in a real-world 12.8 -
13.5 volt world. It'd be interesting if you could actually measure one of the
relays, and/or the voltage across it and/or the lamp(s) in your car.

I believe it.

I believe this too, but I also believe whover told you that is/was full of it.

Immaterial. As I understand so far, the relays are in the brake lamp circuits.
Presence of a tail light or whatever in the same lamp envelope is of no concern.

No doubt. Probably the other responders misunderstood the discussion so far.
Is there a part number for the relay on your car? Maybe I can find the specs.
Googling is good, but in this case I'm either not coming up with the correct
search parameters, or there's just too much stuff...

 

Not a valid assumption. The effective resistance of the lamp would be around 6
ohms for a 27W stop lamp. I'm sure they've made the relay to be around .5 ohm or
less, so the voltage at the lamp would be closer to 12v in a real-world 12.8 -
13.5 volt world. It'd be interesting if you could actually measure one of the
relays, and/or the voltage across it and/or the lamp(s) in your car.

I believe it.

I believe this too, but I also believe whover told you that is/was full of it.

Immaterial. As I understand so far, the relays are in the brake lamp circuits.
Presence of a tail light or whatever in the same lamp envelope is of no concern.

No doubt. Probably the other responders misunderstood the discussion so far.
Is there a part number for the relay on your car? Maybe I can find the specs.
Googling is good, but in this case I'm either not coming up with the correct
search parameters, or there's just too much stuff...

 

Not a valid assumption. The effective resistance of the lamp would be around 6
ohms for a 27W stop lamp. I'm sure they've made the relay to be around .5 ohm or
less, so the voltage at the lamp would be closer to 12v in a real-world 12.8 -
13.5 volt world. It'd be interesting if you could actually measure one of the
relays, and/or the voltage across it and/or the lamp(s) in your car.

I believe it.

I believe this too, but I also believe whover told you that is/was full of it.

Immaterial. As I understand so far, the relays are in the brake lamp circuits.
Presence of a tail light or whatever in the same lamp envelope is of no concern.

No doubt. Probably the other responders misunderstood the discussion so far.
Is there a part number for the relay on your car? Maybe I can find the specs.
Googling is good, but in this case I'm either not coming up with the correct
search parameters, or there's just too much stuff...

 

you /assume/ a coil has a voltage drop of 3V??? what's the resistance
of the coil in proportion to the bulb??? the math is real simple.

dude, /no/ manufacturer puts a relay coil in series with a high wattage
bulb. period.

no. get the bulb number and cross reference it against all the other
applications - it's just a stock bulb used industry-wide.

so? it's called redundancy. it helps keep the car safe when neglectful
drivers fail to check to see if their bulbs are working properly.

i have two different helm [honda factory] circuit diagrams in front of
me right now, and there are no relay coils in series with any light
bulbs. there must have some sort of problem with the drawings you have
if you think you're looking at relay coils.

 

you /assume/ a coil has a voltage drop of 3V??? what's the resistance
of the coil in proportion to the bulb??? the math is real simple.

dude, /no/ manufacturer puts a relay coil in series with a high wattage
bulb. period.

no. get the bulb number and cross reference it against all the other
applications - it's just a stock bulb used industry-wide.

so? it's called redundancy. it helps keep the car safe when neglectful
drivers fail to check to see if their bulbs are working properly.

i have two different helm [honda factory] circuit diagrams in front of
me right now, and there are no relay coils in series with any light
bulbs. there must have some sort of problem with the drawings you have
if you think you're looking at relay coils.

 

Dude, I have the 90-93 Accord Haynes repair manual wiring diagram in front
of me and there is a device called a brake light sensor which uses what's
called a reed relay. There is a relay in series with each brake lamp, when
the lamp is on the current travelling through the relay pulls in a contact
which tells the monitor that the lamp is working. If the bulb is burned out
(open) then no current flows through the relay and the contact remains open,
indicating a brake lamp is out by the brake lamp on the dash.

 

Dude, I have the 90-93 Accord Haynes repair manual wiring diagram in front
of me and there is a device called a brake light sensor which uses what's
called a reed relay. There is a relay in series with each brake lamp, when
the lamp is on the current travelling through the relay pulls in a contact
which tells the monitor that the lamp is working. If the bulb is burned out
(open) then no current flows through the relay and the contact remains open,
indicating a brake lamp is out by the brake lamp on the dash.

 

doesnt the symbol for "light" look like a coil of wire in a bulb? mebbe
TE cheah has morphed?

 

doesnt the symbol for "light" look like a coil of wire in a bulb? mebbe
TE cheah has morphed?

 

and the bulb current is not conducted by the coil, it's conducted by the
reed. that's why there's no voltage drop.

 

and the bulb current is not conducted by the coil, it's conducted by the
reed. that's why there's no voltage drop.

 

I had the same problem .The brake light on the dash stayed lit.There are
2 coils in
the bulb. One coil of the rear brake light bulb had blown.I replaced the
bulb with the correct voltage bulb ,but it did not work.I went to Honda
dealer and they put in the correct bulb,at minimum cost-$2.00

c'mon city-SCAY-Jeff