2017 GS - Multiple Service errors on start
Thread Starter
Instructor
Joined: Apr 2002
Posts: 228
Likes: 11
From: Southern Maryland
what would be your current recommendation that (hopefully) won’t break the bank? Thanks again
Thread Starter
Instructor
Joined: Apr 2002
Posts: 228
Likes: 11
From: Southern Maryland
Race Director
Joined: Oct 2008
Posts: 16,670
Likes: 7,738
From: NJ
Ok here's the next step.
Go to harness junctions one at a time wiggle them while the car is on and check for any changes could be a number of things but now since the battery is eliminated per your statement, I would look for a bad connection at a connector then move to chaffed wiring.
Beyond that? Youll need a wiring diagram and have to start one check at a time with differing relays fuses etc etc.
Sucks.
It's a C6 but watch this video OP. Low miles cared for. No start.
The dealership wanted to swap the instrument cluster had the car a month. Took this guy 2 days to track down the wiring issue.
Go to harness junctions one at a time wiggle them while the car is on and check for any changes could be a number of things but now since the battery is eliminated per your statement, I would look for a bad connection at a connector then move to chaffed wiring.
Beyond that? Youll need a wiring diagram and have to start one check at a time with differing relays fuses etc etc.
Sucks.
It's a C6 but watch this video OP. Low miles cared for. No start.
The dealership wanted to swap the instrument cluster had the car a month. Took this guy 2 days to track down the wiring issue.
Thread Starter
Instructor
Joined: Apr 2002
Posts: 228
Likes: 11
From: Southern Maryland
Slowly but surely... I got the Autel scan tool C5 Diag recommended and here are 2 scans. First, as is- historic with ignition on and second after clearing codes and starting the engine. I didn't play too long last night as it was freezing but I ran some live data tests on the tire monitor system and saw actual tire pressures even tho the DIC shows no readings of any kind. I got a articulating borescope/endoscope camera but haven't found any frayed or chewed wiring so far/yet. Have checked all the fuses front and rear, all good. Slow going as I said... Sure would be nice to have a bigger, warmer garage and a lift 
I'm not a car expert but I've been a electronics technician/ computer systems engineer for 35 years working on large satellite tracking RF antennas and all the data processing and comms crap that comes with them... Def need wiring diagrams and suggestions on scan tool use to narrow things down. Thanks! 
I'm not a car expert but I've been a electronics technician/ computer systems engineer for 35 years working on large satellite tracking RF antennas and all the data processing and comms crap that comes with them... Def need wiring diagrams and suggestions on scan tool use to narrow things down. Thanks! 
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,609
Likes: 4,061
From: Cape Coral, Florida
You should let us know what modules you can and can't communicate with and what DTC's if any you have...you can get a 1 month subscription to Alldata DIY for $19.99...has all the Service Info and OE wiring diagrams you need.
