06 to 07 engine swap? a/c problem - Chevy Trailblazer SS Forum
 

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Old Mar-16-17, 05:44 PM   #1

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Default 06 to 07 engine swap? a/c problem

Hey i just changed my 06 tbss engine for a 07 engine with the full engine harness convertion since the engine is now 58x instead of 24x

Everything is working fine beside the a/c that won't turn on, and i have a battery light on, but the alternator is working fine and my voltage is good 14v+

Anyone ever did a swap like me and know what has to be modified to remove the battery light + make the a/c work ?

I have all the wiring diagram for 06 and 07 if someone needs them
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Old Mar-16-17, 08:56 PM   #2
 
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When you went to the 07, Im assuming you did the E67 conversion as well plus running an 07 TCM OS so it matches the ECM. 07-09 trucks have a different alternator and they have the voltage control module that feeds the ECM what the alternator voltage is, I'm betting that's why you have that code and light. As far as AC, did you use a compressor with the same wiring harness (2 wire or 3 wire) as the new engine harness?

Otherwise, start by probing the AC output from the ECM and making sure it goes to the AC compressor and has continuity.
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Old Mar-18-17, 06:25 PM   #3

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Hey thanks for your reply!

I bought the full engine swap of a 07 tbss, with everything on it (a/c compressor, alternator, p/s pump, all sensors...) I have the E67 computer too with all the engine wiring..

I have both wiring diagram for the 06 and the 07 and it is almost the same beside the EPM that they added in 07..

Now when i look at the EPM wiring in the charging circuit i see a splice (s206) where a wire connect which goes to the a/c circuit.. is that possible that my a/c problem cause the battery light on the cluster?

edit: I also have a u1000 and u1017 code.. but i can connect my scanner with the pcm so i have communication




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Old Mar-18-17, 07:37 PM   #4
 
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Just curious, why didnt you just run a Lingenfelter crank signal conversion box?
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Old Mar-19-17, 04:05 AM   #5

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Bought the truck for cheap without engine/tranny and bought the 07 engine/tranny for it, if i had choice id bought a 06 engine but this was the only one on the market..
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Old Mar-20-17, 02:23 PM   #6
 
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Hmmm based off that diagram, I wonder if the AC being disabled is an effect of the charge light being on and not a cause. If battery doesnt charge, then AC is disabled.

How is the alternator being triggered, it looks like in the diagram above that it will only be turned on when commanded by the voltage module?

Is the TCM programming for an 07 and not for an 06? Have you programmed the VIN into the ECM and TCM from your 06? The BCM might be throwing a fit with the VIN mismatch. If you have HPT, you wont be able to do this unless you unlock the entire model year 2007 TB 6.0.
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Old Mar-21-17, 07:13 PM   #7

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Originally Posted by ScarabEpic22 View Post
Hmmm based off that diagram, I wonder if the AC being disabled is an effect of the charge light being on and not a cause. If battery doesnt charge, then AC is disabled.

How is the alternator being triggered, it looks like in the diagram above that it will only be turned on when commanded by the voltage module?

Is the TCM programming for an 07 and not for an 06? Have you programmed the VIN into the ECM and TCM from your 06? The BCM might be throwing a fit with the VIN mismatch. If you have HPT, you wont be able to do this unless you unlock the entire model year 2007 TB 6.0.
Hey thanks for you reply! I think your right with the fact that if battery doesn't charge, it will probably kill the a/c to save some power there..

I just did some continuity test on my regulated voltage control module and everything is good there, from pin A to J (since i swapped the full engine harness from the 07 it make sense) the only problem is the pin K which is class 2 data that goes in the truck at the SP205 which is still wired for my 06, so this wire isn't connected to my SP205,

If you compare the 06 vs 07 circuit, on the 06 the darkgreen wire connect on pin b on SP205 then exit by pin G to go at the class2pin on the instrument panel cluster,

on the 07 there is the addition of the white wire on pin L that is connected to the darkgreen wire(pinB) (splice in sp205) then goes at the class2pin on the instrument panel cluster





I was thinking about connecting my K wire from the regulated voltage control module to the darkgreen B wire before the SP205 splice


Oh and my mechanic who did the swap had to buy the license with my vin from GM to remove the immobilizer or i don't know how it's call because he said he was unable to start the engine because of the original refeat feature..

Oh and i just googled HPT and i don't have any tune and i don't plan on having one if that was the question

Thanks again man
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Old Mar-22-17, 12:16 PM   #8
 
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If it's not seeing Class II comms, that would explain it.

I dont know if GM ever authorizes things like this, the only thing you can do is relink the ECM to the BCM. If he actually removed VATS, he probably used EFILive or HPTuners to do it. If he's willing to, see if he can change the VIN in your ECM/TCM. Might help clear up the U10xx codes.
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Old Mar-22-17, 04:52 PM   #9

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Originally Posted by ScarabEpic22 View Post
If it's not seeing Class II comms, that would explain it.

I dont know if GM ever authorizes things like this, the only thing you can do is relink the ECM to the BCM. If he actually removed VATS, he probably used EFILive or HPTuners to do it. If he's willing to, see if he can change the VIN in your ECM/TCM. Might help clear up the U10xx codes.
Alright cool, i'll give him a call tomorrow and see.. I have another bigger problem at this time.. yesterday a transmission line snap ring poped and had a major fluid leak, ended up loosing all my fluid, now after the fix+new fluid tranny shift 1-2 perfectly but won't shift into third gear

That's no good
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Old Mar-22-17, 07:33 PM   #10
 
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The VIN is not the issue. With VATS disabled the VIN is irrelevant. Don't worry about rewriting the VIN. It's not necessary.

The battery light is likely on due to the lack of serial data communication. The alternator will default to 13.8v when there is an error so that's why it still charges. Your 07 engine harness will have the white wire going from pin K of the RVCM to Pin A4 of X107. This wire will not be on the IP harness side of X107. You can either add the wire to the IP harness side of X107 and then run it to the splice pack, or you can just connect the white wire to the D-GN/WH wire at X107 Pin C11. X107 is the 40 Pin connector on the back side of the underhood fuse block facing the firewall.

As far as the AC goes, does your 07 compressor have 3 wires going to the clutch connector or 2? Your 06 should have 3 wires. The 3rd wire is a compressor clutch status signal that goes back to the HVAC control module. If your 07 compressor is a 2 wire, then the HVAC control module isn't getting that signal which could be your issue.
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Old Mar-25-17, 06:38 AM   #11

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Thanks for the information, i just looked at the x107 and seems that my mechanic did exactly what you stated... he cut the white wire coming from the rvcm and he spliced the wire with the dark green wire going to the SP205 ( i double checked the continuity with the white wire at the RVCM and the dark green wire at the SP205 Pin B and continuity is good..

one more thing, i just realize that my ground cable are loose in the RVCM (since we had to use aftermarket cable since the oem ones were cut) Could that be the reason of the light from a poor signal reading there?





Thanks again for your help, truck is now at the tranny shop to get a rebuild so should have the truck back at the begginning of the week, didnt had time to verify the a/c connector yet

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Old Apr-11-17, 07:06 PM   #12

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Updates, i have a brand new positive and negatif cable oem.. battery light is still on..
I'm lost now

As for the compressor, there a connector with 3 wire (2 red and 1 black) and another smaller one next to the pulley with two wires (black and red)

Anyone have an idea?

I can provide wiring diagram of almost anything

Thanks !
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Old Apr-11-17, 09:54 PM   #13
 
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I was having a low voltage issue awhile back where the transmission was going into limp mode and it wasn't long before i got a battery light, what fixxed my issue was replacing the alternator with a new one that was clutchless because my alternator clutch burned out and was locked up which is why im guessing i had a low voltage issue. Im an 07 also.. Hope this helps and good luck.

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Old Apr-12-17, 06:14 AM   #14

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I was having a low voltage issue awhile back where the transmission was going into limp mode and it wasn't long before i got a battery light, what fixxed my issue was replacing the alternator with a new one that was clutchless because my alternator clutch burned out and was locked up which is why im guessing i had a low voltage issue. Im an 07 also.. Hope this helps and good luck.

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Hey thanks for the answer, i don't think i have the same issue since my alternator is charging (always 14v)
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