EBCM wiring diagram

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Oct 19, 2005 | 12:40 PM

MattB

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Drifting

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From: Littleton Colorado

EBCM wiring diagram

I need to take some measurements to see if I can find the source of a code on my front right wheel. The code says that the sensor is open or shorted, C1233. I want to take a voltage reading to see if it’s a continuity problem in the wiring. However, I do not know what pins at the wiring harness connection are for which wheels at the EBCM. I have a front mounted EBCM, and it looks easy enough to disconnect the wiring harness from it, but I do not have any info on what pins are for what.

I took a look at the connection at the wheel, and it does not look damaged and the connector did not look corroded.

I’ve found some threads that mention what kind of voltage and ohms to look for, but would like to shorten my trouble shooting a little by knowing what I measuring!

Thanks for any help you can give me.

Oct 19, 2005 | 04:19 PM

Dan_the_C5_Man

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From: Atlanta metro Ga.

Maybe Patches can chime in, since he has access to the manuals in electronic form..

I have that page (that displays the pin-outs) for the main connector on the EBCM module, and yes, I can give them to you when I get home..

BUT, if it were me, I would simply take the wheel off, unplug it from the hub (it's probably not a wiring issue anyway) and measure it right there. That way you aren't trying to spin the wheel at the corner of the car, while looking at a DVM in the engine bay.

Oct 19, 2005 | 06:04 PM

see5

Safety Car

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From: Hobart, WI

Great info here> http://www.gearchatter.com/viewforum42.php

Oct 19, 2005 | 06:15 PM

MattB

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Drifting

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From: Littleton Colorado

The gearchatter link looks very interesting, I'll have to lurk around there a lot more. Didn't see a pin out for the EBCM, but it does look like a lot of good trouble shooting info.

Dan_the_C5_man, I was kind of planning on taking readings at the wheel as well, just to try and find the source of the problem. Don't knw if its the sensor or wires, but hopefully something cheap.

If its not too much of an issue could you post the pin outs for me? If its a hassel then don't worry about it.

Thakns

Oct 20, 2005 | 12:54 AM

Dan_the_C5_Man

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From: Atlanta metro Ga.

No problem, I'm up working anyway..

As they appear on the 32 pin EBTCM connector:

LF wheel - pin 31 (LT Blue) & pin 15 (Yellow)

RF wheel - pin 30 (Drk Green) & pin 14 (Tan)

LR wheel - pin 28 (Red) & pin 12 (Black)

RR wheel - pin 29 (Brown) & pin 13 (White)

Oct 20, 2005 | 12:29 PM

MattB

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Drifting

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From: Littleton Colorado

Thanks a lot!

Oct 20, 2005 | 10:15 PM

1993_FD3s

Heel & Toe

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you do know the sensor creates an ac wave form when the wheel is turned? and the ebtcm sends no voltage to the sensor? is you ebtcm mounted in the front or the rear? i would pull the whole connector and ohm the harness from the ebtcm connector to the last speed sensor connector and see if it is open

Oct 21, 2005 | 02:29 PM

MattB

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Drifting

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From: Littleton Colorado

Yes, I understand that its an AC current and its front mounted. I planning on testing the AC voltage at the connector at the wheel and then where it comes into the EBCM.