2002 Corvette with HVAC NO-COMM
Thread Starter
6th Gear
Joined: Mar 2013
Posts: 6
Likes: 0
2002 Corvette with HVAC NO-COMM
My Corvette's HVAC unit has been randomly loosing power. It is acting like there is a short but tbh I have no idea where I should start looking...
Can someone recommend a good Corvette mechanic in the Plano/Frisco TX area or have some ideas on where to look for the issue?
Thanks
Can someone recommend a good Corvette mechanic in the Plano/Frisco TX area or have some ideas on where to look for the issue?
Thanks
Thread Starter
6th Gear
Joined: Mar 2013
Posts: 6
Likes: 0
Thread Starter
6th Gear
Joined: Mar 2013
Posts: 6
Likes: 0
Thread Starter
6th Gear
Joined: Mar 2013
Posts: 6
Likes: 0
I just drove it around 20 miles and no wetness on the passenger side. BTW the lights on the HVAC work it's just the display and the actual heating / cooling that is not working.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Your IGNITION SWITCH supplies power for a number of KEY ON powered modules. Find the fuses for that module. Actually use a DC Volt Meter and measure the voltage that is being supplied to that modules FUSES when the KEY is turned ON!! There are two TEST SLOTS on top of every fuse. Measure the test slots to a proven chassis ground! You "SHOULD" have full battery voltage on those fuses. If not, the ignition switch is suspect.
They are KNOWN problem areas!
BC
They are KNOWN problem areas!
BC
Thread Starter
6th Gear
Joined: Mar 2013
Posts: 6
Likes: 0
Your IGNITION SWITCH supplies power for a number of KEY ON powered modules. Find the fuses for that module. Actually use a DC Volt Meter and measure the voltage that is being supplied to that modules FUSES when the KEY is turned ON!! There are two TEST SLOTS on top of every fuse. Measure the test slots to a proven chassis ground! You "SHOULD" have full battery voltage on those fuses. If not, the ignition switch is suspect.
They are KNOWN problem areas!
BC
They are KNOWN problem areas!
BC
I went and tested both post of each fuse in hood fuse box here is what I saw:
14+ Volts: 2,3,4,7,13,14,16,17,18,19,22,23,24
0.22 Volts: 5
0.17 Volts: 15
0 Volts: 1,6,8,9,10,11,12
On the passenger side fuse box all were 14+ Volts except:
14: 0 Volts
17, 18, 21: 0.12 Volts
Here are the codes I'm currently throwing:
10-PCM: P0135, P0141, P0155, P0166, P1571, P1689
28-TCS: NO-COMM
40-BCM: B0432
58-SDM: U1040
99-HVAC: NO-COMM
I've been having issues with my Traction Control so that maybe a real code. My O2 Sensors are new, but my vette did sit for a year so I'm not sure if it's related to my issues though.
Thanks
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Thread Starter
6th Gear
Joined: Mar 2013
Posts: 6
Likes: 0
Thanks everyone for your help.
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
DAMN IM GOOD! 
I wonder how I knew that????
VERY COMMON ISSUE. I wish more people would do the FUSE VOLTAGE CHECK instead of JUST the FUSE VISUAL CHECK.
Bill
Drifting
Joined: Sep 2007
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From: Goldsboro NC
1st Gear
Joined: Jan 2016
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My 2002 C5 had issues of throwing codes,would not start when it would start it would shut off driving down the road.I could not find problem,took it to dealer they said it was the ignition switch, and the battery. A $1000.00 bucks later,the car starts fine and does not shut off while driving.But now I have codes popping up Hvac TCS Service vehicle soon and a few others "No Comm" just like I have been reading about.I did not have these codes pop up with the previous problem. Any ideas,and of course dealer hasn't returned my call.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,609
Likes: 4,061
From: Cape Coral, Florida
My 2002 C5 had issues of throwing codes,would not start when it would start it would shut off driving down the road.I could not find problem,took it to dealer they said it was the ignition switch, and the battery. A $1000.00 bucks later,the car starts fine and does not shut off while driving.But now I have codes popping up Hvac TCS Service vehicle soon and a few others "No Comm" just like I have been reading about.I did not have these codes pop up with the previous problem. Any ideas,and of course dealer hasn't returned my call.
Last edited by C5 Diag; Apr 16, 2019 at 09:20 AM.