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ECC not working

Tiny
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  • MEMBER
  • 1994 CADILLAC BROUGHAM
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 122 MILES
I was reading one of you old posts from Cerry on ECC not working. I followed all the way to where you had the client check the three fuse input fuse slots for power all the time which was HVAC battery which I have power all the time. HVAC ign 11.1 volts running, then HVAC module which had o.O8 volts. I did not follow further because your client went and bought new ECC. So I have no power on the last fuse input HVAC module no power.
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Saturday, December 8th, 2018 AT 10:05 AM

32 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Lets start at the beginning.

What is your exact issue with the AC?

Roy
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Saturday, December 8th, 2018 AT 12:14 PM
Tiny
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ECC has no graphics.
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Saturday, December 8th, 2018 AT 1:43 PM
Tiny
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ECC has no operating keys to get any codes.
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Saturday, December 8th, 2018 AT 1:45 PM
Tiny
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In all areas that you indicated to check all are good except in ip fuse panel HVAC module 25 amp has no power.
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Saturday, December 8th, 2018 AT 1:49 PM
Tiny
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This leads me to a conclusion that if all fuse input values point to the ECC module. This seems correct that the ECC is the problem. Would you join me in this or would you go a different direction?
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Saturday, December 8th, 2018 AT 1:54 PM
Tiny
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When this first happened I had blower working with no heat or cool and no graphics on ECC.
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Saturday, December 8th, 2018 AT 1:56 PM
Tiny
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Your third picture down had the most value and gave me the same conclusion you client did, except when I had no power in fuse input HVAC module either with it on or off.
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Saturday, December 8th, 2018 AT 2:01 PM
Tiny
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This is where I am at this time. I have no other input. I hope something might give you an idea.
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Saturday, December 8th, 2018 AT 2:03 PM
Tiny
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  • MECHANIC
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If you have no power at the fuse block for that fuse, that is a issue with the fuse block.

That needs power as it does feed the control head.

Roy
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Saturday, December 8th, 2018 AT 2:06 PM
Tiny
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When I sent you the answers I may have neglected to indicate that the reading was o.O8 which is like it was reading the cable itself.
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Saturday, December 8th, 2018 AT 2:21 PM
Tiny
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If the book says the line is orange I should be able to read from the ECC unit to the fuse box?
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Saturday, December 8th, 2018 AT 2:23 PM
Tiny
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No, that is the meter.

It needs to be battery voltage. It looks like you have either corrosion or a break in the bus bar in the fuse block.

Roy
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Saturday, December 8th, 2018 AT 2:25 PM
Tiny
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As I look at the diagram if the orange wire comes from the ECC battery side would you concur that there is a defect in the inside the ECC?
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Saturday, December 8th, 2018 AT 2:30 PM
Tiny
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I say this only as it looks as if the ECC is the only source for voltage in this diagram going to that fuse number? Do you agree?
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Saturday, December 8th, 2018 AT 2:33 PM
Tiny
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According to the diagram the only power that is received to the HVAC module as there is only the orange wire is from the ECC. Would you agree? Or am I not looking at the ECC diagram?
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Saturday, December 8th, 2018 AT 2:39 PM
Tiny
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If you have no power to the orange wire, it is not the ECC. The ECC does not generate voltage, the voltage comes from the fuse block to the ECC.

Roy
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Saturday, December 8th, 2018 AT 2:41 PM
Tiny
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Roy is that power to the orange wire come from a source going direct to the battery or from a relay and then to the fuse?
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Saturday, December 8th, 2018 AT 2:51 PM
Tiny
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If you look at the diagram, you will see it originates at the fuse block, the source of power.

As I stated two times so far, if you have no power at the fuse, you have an issue with the fuse block itself.

Roy
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Saturday, December 8th, 2018 AT 2:57 PM
Tiny
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Roy I see where orange comes in at HVAC battery which must connect to the deficient HVAC battery. Would you agree?
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Saturday, December 8th, 2018 AT 2:58 PM
Tiny
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The HVAC fuse, yes. That is the source of power.

Roy
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Saturday, December 8th, 2018 AT 3:00 PM

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