Envoy OBD II Connector - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 08-26-2009, 08:28 AM
OldMike OldMike is offline
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2005 GMC Envoy SLT
Midnight Blue Metallic 4.2L I6 4X4
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Envoy OBD II Connector

Hi everyone! I'm new to this site and need some info. My lady friend has an 05 Envoy SLT. The check engine light came on and I tried to hook my scanner to read codes and I can't get a connection. Anything different about the pin placement on this vehicle? Or am I just not making good connection? Any help greatly appreciated.
Mike
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  #2  
Old 08-26-2009, 11:02 AM
Fefanatic Fefanatic is offline
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2007 GMC Envoy SLE
Liquid Silver Metallic 4.2L I6 AWD
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OBDII is a standard. It should work if your scanner is updated with 05 software. Make sure your connection is good. If you still have a problem with scanning check the ecm fuse and make sure it is good.
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  #3  
Old 08-26-2009, 11:13 AM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
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Welcome!

The OBD power connector on this vehicle is fused by the CIGAR fuse #13 in the front fuse block under the hood. (There is another fuse block under the rear seat - driver's side, but that's not involved.)

It astonishes a lot of folks because I don't think it's documented in the Owner's Manual, and I had to do a lot of digging in the shop manual to find it.
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Old 08-26-2009, 11:33 AM
Fefanatic Fefanatic is offline
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2007 GMC Envoy SLE
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That's good to know. It's possible that a GPS or other accessory could have blown it. That also might be the cause of the cel being lit.
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  #5  
Old 08-26-2009, 11:47 AM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
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Sadly, the CEL won't come on for something like this blown fuse. Let us know what it says - plenty of collective experience here at trailvoy.
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  #6  
Old 08-27-2009, 09:16 AM
OldMike OldMike is offline
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2005 GMC Envoy SLT
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Thanks for quick and good answers, Roadie & Fefanatic! Last year I bought an 07 PT Cruiser so I had to buy a new scanner with the new CAN standard, therefore I think my scanner is up to date. It works fine on the Cruiser and my 02 Olds Alero. The check engine light has gone off so I think it was probably a gas cap issue, but I want to be ready next time it happens. I'll check the fuse, but she keeps her GPS plugged in most of the time and it works OK. I'm going to take the OBD connector off and be sure I am getting a good connection. Will update after that.
Thanks again,
Mike
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  #7  
Old 08-27-2009, 01:30 PM
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neelskit neelskit is offline
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2002 Chevy TrailBlazer LT EXT
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FYI, the front Aux 12V plug and the Cigar Lighter are on separate circuits.
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  #8  
Old 08-28-2009, 09:55 AM
OldMike OldMike is offline
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2005 GMC Envoy SLT
Midnight Blue Metallic 4.2L I6 4X4
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Location: Owensboro, KY
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Thanks Neelskit. Haven't taken time to check out fuses and connection yet, but you guys have given me good info. Can I just use my DVM to check for 12V at pin 5 & 16 on connector?
Thanks
Mike
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  #9  
Old 08-28-2009, 11:05 AM
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Those are the pins, all right.
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  #10  
Old 09-17-2009, 02:11 PM
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smalltownrp830 smalltownrp830 is offline
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2002 Chevy TrailBlazer LS
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my change oil light came on so i tried hooking up my obd and no power..but i remembered one of my cig lighters was not working cus a fuse blew out. i didnt bother to try to change it out till now to see if this will work. MAD PROPS TO ROADIE!!!thnx
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