Electronics Problems due to Heat
Posted to Technical Tips Forum on 12/30/2023
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This may be issues with all vehicles but to show how heat
degrades controllers in GM vehicles where I have seen and
repaired the damage
Focus on controllers like the HVAC head, door and EBTCM is
common for these to start acting oddly Here is an example of
the HVAC controller where it does not work correctly or the
LCD screen is very dim
[Dim HVAC Srreen]
[Contents of LCD Very Dim]
Using GM service manual looking at the wiring for the HVAC I
did what was needed to make the controller active and
closely looking at solder joints found due to heat the
solder joints are very thin caused cracks
[Surface Mounted Resister Packs]
Debugging the electronics board, the resister packs found
the joints cracked You need to look very closely and also
look for heat coloring
Once I had reflowed the solder joints, tested and now the
contents of LCD was bright again even in sunlight
[Once Reflowing Solder Joints]
I find issues like this also with door controllers, EBTCM
and IPC
John Rovner Owner Team ZR-1 Corvette Racers llc Greenville, Texas, USA
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