LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

cruise control ls1 swap

Old 05-17-2019, 06:35 PM
  #1  
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Join Date: Jun 2002
Location: North East GA
Posts: 1,863
Car: 1989 Firebird
Engine: 5.7 LS1
Transmission: T56
cruise control ls1 swap

I've based my wiring off this:
https://ls1tech.com/forums/conversio...driven-tb.html


With a truck module the cruise will engage but not with the 2000 fbody module. I purchased a GM cruise tester, and with that the fbody cruise will set. The tester shows that I have the buttons wired right and indicates the brake switches are wired right.

On the cruise module I have the H and J going to the PCM on pin R13 and R37
and pin K going to the R50 (set to 4000 pulses per mile) -- the tester also shows this is good

pin D goes to the brake switch and the clutch switch both normally closed 12vdc (so clutch & brake up gives 12vdc)
Ping G goes to the brake switch normally open (brake up 0v, brake down 12vdc)

With HP tunners I see that the cruise lockout stays yes.

What inputs does the PCM need so that the cruse lockout goes to no? I've seen a post or two where they say the cruise on switch needs to also go to the PCM as well as the module... however I don't see that in the schematics?

Does the PCM need a reference to the brake switch?

The truck module doesn't use the PCM lockout so that is why it works.

I'm stomped and not getting anywhere in these schematics.

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Old 05-18-2019, 12:02 PM
  #2  
Supreme Member
Thread Starter
 
Join Date: Jun 2002
Location: North East GA
Posts: 1,863
Car: 1989 Firebird
Engine: 5.7 LS1
Transmission: T56
Re: cruise control ls1 swap

Was a faulty ground on the cpp switch. The fbody module now works.
Aviator857 is offline  
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