ABS low tire TRAC testing

[jem270]

I have ABS low tire and TRAC lights on. This is what I have done so far.

I checked resistance at each hub.

Left front is 1.103. Right front is 1.086
Left rear is 1.112 Right rear is 1.085

I then did tests per 1997 Dealer service manual on page 5E2-19.

Step 1 check 24 way and 8 way connectors. They looked OK

Step 2 and 3 use scan tool. I don’t have one

Step 4 Check resistance on radio #29 10amp fuse connection. My meter showed 1.0 the manual said it should be between 0 and 2

Step 5 Check ABS IGN 10A fuse connection resistance. My meter showed 1.0 the manual said it should be between 0 and 2

Step 6 Check 8 way EBCM connector resistance between terminal D and ground. I show 0.01 manual said it should be betwwn 0 and 2

Step 7 Check 24 way EBCM connector voltage between Terminal B12 and ground. I show 0.00 but it should be 10v

I checked the EBCM connector diagram on page 5E2-16 and it shows only 24 holes. The one I have is different. I has probably 36 holes but only 24 of them have electrical ends in them. Also according to the manual, terminal B12 should be an orange wire. Mine connector does not have an orange wire.

1. When my meter shows 1.0 on resistance I assume it means infinite and is OK.

2. Should I assume the EBCM is working properly because if I disconnect either the 8 way or 24 way connector, the interior lights go out.

Here is a picture of my EBCM.

[BNaylor]

Based on the above it sounds like you have the body control module (BCM) and the electronic brake and traction control modules (EBTCM) mixed up.

Therefore, you have located the wrong module.

The EBTCM module should be the first one you see before the BCM and DRL modules.

[jem270]

I'm confused.

The manual calls the part a EBCM/EBTCM. It is the unit on the right with the red label with 10293827 on it. The connector on the left side of it is the 8 pin one and the one on the right is the 24 pin one.

I thought the unit on the left is the daytime running light module and the unit in the back was the BCM.
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I found this using google.
Back side = ABS ECM 16246621

Red label = Body Control Module (BCM) 1997 to 1997 GRAND PRIX (left of steering column) ID #10293827
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This a picture of what I thought was the BCM.

The more I read the more confused I get. Please identify these parts for me. Thanks.

[BNaylor]

The BCM module is the one with the 10293827 part number. It is the larger of any of the modules you see. I believe the smaller is the DRL module. You can confirm by removing the two electrical connectors and DRL operation to include auto headlight should not be functioning when releasing the emergency brake and you will have manual control only via the headlamp switch. Easier to remove that module from the mounting tray before removing the electrical connectors. So the question is where is your EBCM/EBTCM module? According the the '97 GM Grand Prix FSM it is supposed to be located in the same general area but I see with the annotation "behind left side of instrument panel". Also, there is an ABS relay (electronic brake control relay) located in the same general area.

[jem270]

I found an old link with part number 10293827. It does appear that I have been testing the BCM instead of the ABS ECM.

http://www.automotiveforums.com/vbul...light=10293827

Im getting confused on all the terms.

I guess what the manual is calling the EBCM/EBTCM is actually the ABS ECM with part number 16246621.

Or are they talking about 2 different parts. EBCM and EBTCM.

Would the EBCM be the BCM? 10293827

Would the EBTCM be the ABS ECM? 16246621

[BNaylor]

I'm quite sure it is one part. As long as you have traction control it will be called an EBTCM module. Were you able to find the module under the dash per the FSM?

If not I have a theory or a possible answer as to where it is located and the reason why.

[jem270]

I can only look at it on weekends. My son drives it during the week at college. I will try to look at the manual again this evening and I will report if I do. If not I will look again this weekend. I may go down on wednesday to see him. Is there anything in particular I should look for? Thanks for responding.

[jem270]

I haven't verified where my EBCM/EBTCM is yet.

If anyone needs the information in the 1997 service manual, I have taken pictures of the pages refering to the EBCM/EBTCM.

http://www.supermotors.net/mygarage/...0067&sID=58834

[BNaylor]

Originally Posted by jem270

I haven't verified where my EBCM/EBTCM is yet.

There may be a discrepancy or outdated material in the '97 FSM. If you cannot locate the EBTCM module under the dash then it will most likely be located at the ABS modulator assembly which has the ABS motorpack, solenoids, etc. Located under the brake master cylinder area. It will be the first module where the electrical connector is located. I have a pic I can post later.

Reason is GM used different ABS systems (Bosch or Delphi) starting around the late '97 and '98 model years.

[jem270]

Here is the pictures of my ABS modulator and the Solenoid valves. I don't see the EBTCM module. At least nothing like the connector is supposed to look like.

[jem270]

Here is a picture of the ABS system according the service manual.

[Firstymer]

hey,

I have a problem with my 00' Pontiac GP SE. On the dash, it reads low trac or trac signal is lighted. What actually does that means? Can you help resolve the problem. Even though I got the left rear tie rod replaced and link arm but it still reads low trac or trac on the dash....

Originally Posted by jem270

I haven't verified where my EBCM/EBTCM is yet.

If anyone needs the information in the 1997 service manual, I have taken pictures of the pages refering to the EBCM/EBTCM.

http://www.supermotors.net/mygarage/...0067&sID=58834

[jem270]

You may want to start a new thread for your problem.


Did you read the pages I posted for the 1997 model? I don't know if it applies to your 2000 model but it may point you in the right direction.