Ls harness question

[Tomeal]

I am following instructions on lt1swap and have a question.

E38 ECM Connector Pinouts

Directions say pins highlighted in blue are needed for external connections. Are those pins removed or left in the ecu connector? If removed, are the wires removed from the loom so they can go to another connection?

I think I'm overthinking something. Just want to pull what needs out and not have to go back through.

Any guidance is greatly appreciated!

 

[64nailhead]

The blue highlighted wires are needed, but by another ECU if you're using one or manual switches/relays, i.e. cooling fan and brake light triggers. The yellow wires can be done away with.

How are you running the brake lights, cooling fan and everything else highlighted in blue?

 

[L92 OLDS]

I am following instructions on lt1swap and have a question.
Directions say pins highlighted in blue are needed for external connections. Are those pins removed or left in the ecu connector? Any guidance is greatly appreciated!

If highlighted in blue do not remove the pins or the wires. You need them for a standalone harness.

 

[Tomeal]

If highlighted in blue do not remove the pins or the wires. You need them for a standalone harness.

That was my original thought, but then I started second guessing myself.

 

[Tomeal]

The blue highlighted wires are needed, but by another ECU if you're using one or manual switches/relays, i.e. cooling fan and brake light triggers. The yellow wires can be done away with.

How you running the brake lights, cooling fan and everything else highlighted in blue?

I was going to work on that once I got the harness stripped down.

Fans Im planning on sourcing electric fans and using relays. Honestly the rest will be questions I will need guidance on once I get to them. My research shows so far that most are using some kind of small fuse/relay holder to accomplish some of it.

I kinda just wanted to feel like I made one small step of progress first.

 

[64nailhead]

Regarding the brake lights, throttle pedal, transmission, cruise control, HVAC system etc, I'd recommend knowing how you intend to run all of these before I took wires out of the harness. Most of this stuff is very straight forward as long as you don't want the ECM controlling those items.

Lastly, take notes and save the notes (in a notebook work great 😉 ) I have a notebook on every car I've built/swapped for reference later. Implying, record which wires you remove from you harness/ecm connector so that you won't go looking for them later.

 

[Tomeal]

Throttle pedal and wiring I saved from the donor vehicle. Was messing around one day coming up with possible solutions. Ac and cruise I am not doing. Trans and engine came from donor vehicle, trans is controlled by the ecm. No separate controller. Will be heat only.

I'm just working the wires out of the ecm connector. Figured I would strip them out and re-loom them once I knew what was coming out

 

[Tomeal]

So another question. Not sure if anyone encountered this. A couple locations that I was to remove pins, there were no pins. That I think is ok. Engine came from a 3500 box truck. It didn't have electric fans. It has a fan clutch.

Problem is there looks to be no opening to put a wire into it.

You can see in the pic what I'm referring too. Poked at it very lightly to see if it would "pop" out. Don't want to be to forceful and mess something up.

 

[RabbitHoleSS]

Just push the pins thru. I think it's like a grommet to keep water out. Atleast that's how my p(powertrain)59 was. Also I'm pretty sure the e(engine)38 is an ecm, so it doesn't have the transmission controller built in. There's a transmission controller (t42) under the driver battery tray of the trucks with e38 ecm.

 

[Tomeal]

Just push the pins thru. I think it's like a grommet to keep water out. Atleast that's how my p(powertrain)59 was. Also I'm pretty sure the e(engine)38 is an ecm, so it doesn't have the transmission controller built in. There's a transmission controller (t42) under the driver battery tray of the trucks with e38 ecm.

Sorry, said that backwards. I'm using the 6l90 trans, it controller is built into the trans.

Working on the harness some more today. Will see what I find out.