A very strange climate control issue.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 188
Likes: 80
From: little rock Ark
A very strange climate control issue.
I have a strange problem. My abs fell into the pit that all C5 abs units fall into. So my tc and abs light are on all the time. now my problem is my climate control is dark and doesn't work until the hud chimes and tells me to service the abs. this may happen 5 mins into a drive or 45 mins sometimes i can fell the abs work in a hard brake and then it will chime and the climate control will start working any ideas?
Team Owner
Joined: Jul 2016
Posts: 25,303
Likes: 1,683
From: The Steel City, Colorful Colorado
Winner 2020 C7 of the Year - Modified
The dim / dark climate control problem is an easy fix if you are willing and able to take the HVAC controller out and do some minor soldering. Search the forum and you will find numerous detailed posts on the fix. 
Safety Car
Joined: Mar 2016
Posts: 3,534
Likes: 432
From: Atlantic Beach FL.
Low voltage can cause some strange problems. Check your alternator and check for grounding issues as mentioned in the electrical sticky.
What codes are you throwing?
What codes are you throwing?
Last edited by Rob 02; Feb 11, 2017 at 03:32 AM.
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
Thread Starter
Instructor
Joined: Sep 2013
Posts: 188
Likes: 80
From: little rock Ark
Its not dim or dark it doesn't work at all until the abs chimes. then it works great. how does the abs chime tie into the climate control? it only gives me a code for abs/Tc.
Last edited by gearheadib; Feb 13, 2017 at 10:29 AM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
LOL! As weird as it seems, I would suspect that you have an IGNITION SWITCH issue. The contacts inside the switch part are burnt and do not allow proper voltage through the switch contacts for that circuit until the contacts get warm/hot..
Hers a post for you.. You can prove that this is the issue by using a meter and testing the voltage at the mini fuse test points on top of of the fuse. There are TWO small test points on all the fuses. Measure them to CHASSIS GROUND. They should read FULL battery voltage when the switch is ON.
Test the HVAC Fuse and see if it reads LOW when it doesn't work!
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
Let us know if I was correct!
Hers a post for you.. You can prove that this is the issue by using a meter and testing the voltage at the mini fuse test points on top of of the fuse. There are TWO small test points on all the fuses. Measure them to CHASSIS GROUND. They should read FULL battery voltage when the switch is ON.
Test the HVAC Fuse and see if it reads LOW when it doesn't work!
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
Let us know if I was correct!
Last edited by Bill Curlee; Feb 13, 2017 at 11:08 AM.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 188
Likes: 80
From: little rock Ark
LOL! As weird as it seems, I would suspect that you have an IGNITION SWITCH issue. The contacts inside the switch part are burnt and do not allow proper voltage through the switch contacts for that circuit until the contacts get warm/hot..
Hers a post for you.. You can prove that this is the issue by using a meter and testing the voltage at the mini fuse test points on top of of the fuse. There are TWO small test points on all the fuses. Measure them to CHASSIS GROUND. They should read FULL battery voltage when the switch is ON.
Test the HVAC Fuse and see if it reads LOW when it doesn't work!
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
Let us know if I was correct!
Hers a post for you.. You can prove that this is the issue by using a meter and testing the voltage at the mini fuse test points on top of of the fuse. There are TWO small test points on all the fuses. Measure them to CHASSIS GROUND. They should read FULL battery voltage when the switch is ON.
Test the HVAC Fuse and see if it reads LOW when it doesn't work!
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
Let us know if I was correct!
Last edited by gearheadib; Feb 13, 2017 at 11:42 AM.
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