I'm needing help with finding the E38 connector pin out for a 2012 GM 5.3 liter Pickup.
Thanks
dave w
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I'm needing help with finding the E38 connector pin out for a 2012 GM 5.3 liter Pickup.
Thanks
dave w
I can offer you 2009 which SHOULD be the same, but thats as far as my information currently goes. Pm me an email address if you want it and Ill send it to you in pdf.
I have them. Trying to load them up.
try these
That looks great for the X2 (Gray) connector!Quote:
Originally Posted by S10LS
Hope you can post the X1 (Black) connector?
dave w
Trying. I cant stand Alldata sometimes. And I am not sure about how accurate alldata is.
This should be it.
Thank you!:thumbsup:Quote:
Originally Posted by S10LS
I was able to get some Alldata schematics at my local library, but I could not find the connector pin outs.
dave w
The attached .pdf has the Alldata schematics I printed from my local library.Quote:
Originally Posted by dave w
dave w
You get the info you needed Dave? Have ShopKey/Mitchell here if you still need.
I think I'm doing OK. This weekend is when I get my hands dirty with the actual wiring. So far the wire colors and pin outs match the harness. I seem to favor the Mitchell Manual diagrams (before 2002 anyway), so it would awesome if you could post the Michell ECM diagram.Quote:
Originally Posted by brian617
I'll post up more schematics I got today that should help someone wanting to set up a 2012 harness for stand alone.
dave w
More schematics.
dave w
Dave, I've tried to figure out a way to post those diagrams but it seems if ShopKey is protected from duplicating, or I'm just too stupid to figure it out lol. Sorry.
I'm adding the data Link Schematics. See attached.
I have two questions:
What is the Data Link Resistor?
If a module, like the Body Control Module, is removed from the vehicle ... Is a Data Link Resistor still needed?
dave w
Not to worry ... in a Hot Rod / custom application the E38 provides this to the CAN Bus network.
As an example, you can bench read an E38 with tuning software, without issue.
Try connecting to just a TCM (T42 / T43 / T76) without an ECM on the CAN Bus network - doesn't seem to work, does it ?
Now, bridge the CAN Bus lines with a 120 ohm resistor, and try reading the TCM on its own again - son of gun, the tuning software will now read the TCM.
The CAN Bus communications protocol requires 120 ohms resistance (a.k.a. - Data Link Resistor).
I have new questions about the E38 wiring. It appears the E38 dual fan wiring is almost identical to the '0411 dual fan wiring. I'm wondering why the diodes are installed. I'm also wonder if anyone has a part number for the dual fan diodes. I'm thinking the diodes are for circuit isolation?
dave w
Dave, after looking at that schematic I can tell you that the diodes are either integral to the fuse block OR the more likely possibility is that they plug into the fuse block like standard blade fuses. I have seen many later model fuse blocks that have diodes in them. I don't have a part # for you, but you can salvage lots of them from various later model GM fuse blocks. I more than likely have a few of them in my toolbox that I'll take a pic of later when I head down to the basement. The purpose of the diodes is to isolate the two fan circuits from each other so that the ecm can turn on fan1 on a low speed with one output and turn on both fans on at full speed with a second. Without getting all crazy with a drawn-out explanation, the diodes are crucial to proper operation with that particular wiring and solenoid configuration.
On a related note, I do have a little bit to add on your other threads pertaining to this same project that you're working on. It will take me a while to type up those posts though, so it will be later in the day before I can reply to those topics.
Hope I was helpful,
Phil
I was looking through the harness for the Transmission Control Module (TCM) plug, then I learned that the TCM for the 6L80E is inside the transmission ... the internet is usually a good source for information? It might seem odd to some members that I did not know where the 6L80E TCM was.:rolleye: My main role in this conversion is wiring and the computer flash (the fun stuff:thumbsup:).
dave w
Yes sir ... 6L80/90 TCM connector looks like this ...Quote:
Originally Posted by dave w
Attachment 7012Attachment 7013
Makes it a pain in the ass when replacing a bad transmission. Have to haul truck to dealer to get replacement trans/TCM flashed so it will communicate with ECM.Quote:
Originally Posted by dave w
The T43 actually isn't too oppressive to work with. The newer ECMs (E38 / E67 / E78 / E83 / E92) need a GM dealer / TIS flash if replaced - as tuning software cannot read / write the throttle control portion (second core) of the ECM.
The T42 / T43 / T76 TCMs can be completely reflashed using tuning software - making them a little more user friendly.
I've noticed some "brake" related pins in the E38 computer.
The pins I have questions about are on the X1 connector (Black 73 pin connector):
X1 - 26 Brake Apply
X1 - 42 Brake Apply
X1 - 54 Brake Apply
Are the above pins inputs / outputs from ABS? Are the above pins inputs / outputs from somewhere other than the ABS?
The other pin I have a question is:
X1 - 09
I'm thinking this is from the brake switch and in a Normally Closed input to the E38 computer?
Thanks,
dave w
I believe that these are generally not used with E38 non-Hybrid trucks. Hybrid uses pin 54 for fan control. V6 trucks (E37 ECM) does use these pinouts.Quote:
Originally Posted by dave w
Can you post the schematics your question is based on ?
Gen IV brake input logic is the opposite of Gen III.Quote:
Originally Posted by dave w
Gen III PCM receives 12 volts when the brakes are NOT applied - and this circuit is interrupted when the brakes are applied - a Normally Closed circuit.
Gen IV ECM / TCM receive 12 volts when the brakes ARE applied - and this circuit is interrupted when the brakes are released - a Normally Open circuit.
I do not have schematics, I'll need to research (visit my local public library) for the schematics.Quote:
Originally Posted by Buzz
dave w
alldatadiy.com or eautorepair.net/
Should have any and all diagrams you need
Agreed!Quote:
Originally Posted by Munchies
My local public library has alldata online at the outrageous price of FREE!:thumbsup:
The .pdf files I attached earlier in this thread are from the pages I printed at my local public library.:thumbsup:
I admit, I have a 14 mile round trip (freeway speeds mostly) to get to / from the library. Not exactly free.
dave w
Ah!. Makes sense!.
If you need anything I have alldata and all of the domestic disks here.
I know it's been a while since I posted about the diodes, but I've not had much time for anything lately. I'm not sure if you found any more info on the diodes either, but here are a couple pics I took of one that I dug out of the toolbox. There are different ones and this one is for an A/C system IIRC, but this will give you an idea what they look like.
Attachment 7021 Attachment 7022 Attachment 7023
I have learned there is a Brake Pedal Position Sensor.Quote:
Originally Posted by dave w
X1 - 26 Brake Apply ~ Yellow wire Circuit 5361
X1 - 42 Brake Apply ~ Brown wire Circuit 5360
X1 - 54 Brake Apply ~ White wire Circuit 5359
I will need to disable the both P057C and P057D Brake Pedal Position Low / High.
I was not able to find a schematic for connector X1 - pin 09 brake switch.
dave w
Found some Delphi part number 12135037 diodes at Mouser http://www.mouser.com/ProductDetail/...F%252bQTKos%3dQuote:
Originally Posted by pmkls1
dave w
Give me a year and model I will go for a quick dig.Quote:
Originally Posted by dave w
Dave,
Glad you found what you needed for the diodes. As for your need for info on circuits I have a suggestion that may be of great assistance. You can actually buy a trial subscription to the GM Service Information database. It costs $20 for a 3 day subscription and given the nature of your project I feel that it is well worth it. If you were simply needing a couple wiring diagrams then $20 might be a little steep, but the intensity of your project warrants the cost IMHO. The amount of knowledge that you can obtain can prove quite invaluable because, aside from being able to view and print any and every diagram that you need, you can also view a detailed description and operation of any and all systems of the vehicle. The trial subscription gives you unrestricted access to all sections of SI so you can access any info that is available there. I have used the trial subscription once before when I needed some detailed repair info for a couple of my vehicles after my former employer had finally removed me from the GM system. I'll attach a link to the site where you can purchase the subscription and access everything. https://www.acdelcotds.com/acdelco/action/subscribehome
HTH,
Phil
2012 Silverado 4WD 5.3 Liter VIN 1GCRKSE77CZ259538Quote:
Originally Posted by Munchies
dave w
Hi Phil,Quote:
Originally Posted by pmkls1
Thank you very much for the link!:thumbsup:
dave w
I am pulling a bunch of stuff, and saving it to a folder, but the ECM
I am pulling up a bunch of stuff, but the ECM connector is labeled as X2 in all of my docs here.
I dont think I have had enough coffee.
Is this the donor?
http://www.salvage-cars-for-sale.inf...12-MTY4Mjk5ODM
Anything look right here?
https://drive.google.com/folderview?...mM&usp=sharing
foundx1 and added it. looking for the actual diagram now. Forgot how much alldata diagrams are a PITA. Downloading mitchell now lol
I don't know if that was the donor vehicle. Could have been.Quote:
Originally Posted by Munchies
It all looks good. I found the same schematics also. I was not able to find a schematic showing where X1-09 (Circuit 6311) is connected to?Quote:
Originally Posted by Munchies
dave w
It doesnt show up anywhere I can find except the x1 pinout. Downloading mitchell now
Spoke too soon. I found it under cruise control finally.
See new file x1099 in link
Wiring diagrams are split up into their corresponding category so sometimes they can be difficult to locate. I.E. The wiring diagram for a brake switch input at the ECM from the ABS system may be found in the ABS category instead of the Powertrain Management category. Or, in this case, the brake input or output for the Cruise Control will be found under that category instead of Powertrain Management.
Also, to address a much earlier but critical question, the data communications in these late model systems uses a twisted pair wiring configuration that requires a 120 ohm terminating resistor at either end. As you can see in one of your diagrams posted earlier the ECM in this vehicle contains one of the terminating resistors, but in order to communicate with the modules the other end of the twisted pair must have a terminating resistor as well. I don't know about operating the ECM without a BCM, but I was under the impression that it was not possible because the BCM serves as a gateway module for all module communications and more importantly it is a power-moding module that manages the power mode for all modules on both the high-speed and low-speed LAN networks. This means that the ECM and TCM do not wake-up with a switched +12v power source, rather the BCM sends a wake-up command over the high-speed LAN network. I do not know how these modules behave without the BCM connected to the data lines. Yes you may be able to communicate with them, but will they wake-up and sleep properly ? If the modules don't switch to sleep mode, their rate of power consumption when awake would most likely drain a battery overnight.