squeals99

iTrader: (8)

so yeah i put a led third brake light in today and sure enough the abs inop light came on... any fixes to this?

94LTZ

iTrader: (5)

You need to put a Relay in line

squeals99

iTrader: (8)

how much resistance do i actually need? and where can i put one that wont be a pain?

94LTZ

iTrader: (5)

I'm working on that actually for my car after the LED install with my SS spoiler, but the easiest location is where the brake light and the wiring harness actually meet under the plastic cover in your trunk lid, not sure on the resistance you need but if you find out let me know lol

squeals99

iTrader: (8)

lol will do... my dad's an electrician so ill have to have him check it out... possibly put the old bulbs in again and see what they put out and then try to match that...
ill def let ya know if we figure out anything

1993 z28 f1

iTrader: (6)

Hey:

Check your cruise control out if it does not work you'll have to add a resistor pack to get it to work again with LED tailights.

Dub

When In Doubt Do Without

shbox

http://shbox.com/1/relay_for_ss_spoiler.jpg

squeals99

iTrader: (8)

thank you sir!

airfix

iTrader: (30)

I Followed the how to on shbox website. Worked awesome.

squeals99

iTrader: (8)

question though... where can i find this relay?

LT1

iTrader: (1)

Autozone or any auto store

ask them for the automotive relay with the 87, 87A, ,30, 86, 85 pin.

ive used this type of relay for a lot of things on my cars like eletric fan's, push button start, ect...

airfix

iTrader: (30)

I just pulled out my a/c relay and got them to match it up at the auto parts store.

TopFlite

Subscribing. I'll be installing an SS Spoiler with the LED as well.

95_transam_lt1

iTrader: (6)

why would a led 3rd light cause an abs inop light?

shbox

Because the LED (as opposed to the bulbs) does not provide the resistance the ABS and cruise uses to tell if the circuit is intact.

95_transam_lt1

iTrader: (6)

makes sense

wrd1972

iTrader: (12)

Yeah the PCM expects to see the x ohms value of resistance provided by the two light bulbs. Just match the value with a resistor and use a relay.

shbox

The actual mod to use the relay uses the relay coil as the resistance (relay not used in the normal fashion). The relay coil is used because common resistors cannot handle the amps of the circuit and dissipate enough heat to be safe.

wrd1972

iTrader: (12)

Ah I see. I assumed it had to see a certain OHM value.

I have the LED spoiler and LS1 tail lights myself. The LS1 taillights have two additional bulbs in them so my PCM still sees the actual bulbs like it wants. No relays needed if you do this mod.