| [GMCnet] Inoperative Quad Airbag system [message #360979] |
Sat, 19 December 2020 12:13  |
Kenneth Doyle
Messages: 9
Registered: September 2020
Karma:
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Junior Member |
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My 1975 GMC has a quadbag system installed by Jim Bounds many years ago. It
has never given me any problems except for some leakage, generally taking a
couple of days or longer to leak down.
I had some engine and other miscellaneous work performed this past week.
Improvements included wiring the radio to the ignition switch, which had
previously been wired to the house battery. The horn relay was also
replaced and a new horn was installed. Also some carburetor work. But no
work was performed on the airbag system. It was working normally.
I drove it home with the bags inflated, but the next morning the bags were
deflated on both sides. When activated, the system would not raise the
coach. or inflate the bags. The air compressor operates to fill the air
tank. I tried to inflate the bags, on both sides, at the air value next to
the system shutoff valves (at the wheels). Neither side would inflate. The
end shut-off valve was closed, the two valves leading to the bags were
open. The airbag air gauges on both sides of the coach would register 75lbs
of pressure, and hold that pressure, unless the end shut-off valve was
opened.
What would cause the system to totally fail in this manner? Could one of
more sensors be out, or was electrical power severed to the system that
during the horn and radio rewiring? Suggestions welcome.
Thanks,
Ken Doyle
1975 Glenbrook
SE Kansas
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