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11-23-2019
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#1 |
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Join Date: Oct 2013
Location: England
Posts: 35
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1990-1990 C4 Corvette Front Air Bag Warning Light On
Can I test my air bag impact sensors ? Could it be the steering wheel ?
I have checked that both sensors are earthed. |
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11-23-2019
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#2 |
 
Join Date: Oct 2017
Location: TX
Posts: 1,969
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Re: 1990-1990 C4 Corvette Front Air Bag Warning Light On
Pat,
Is the seat belt light on also? Check the wiring connectors behind the driver's side kick panel and under the carpet on passenger's side of the trans tunnel. Yellow wires. Bad connections at these locations are a common issue. Take care. 
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Kenny 1990 #442 
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11-24-2019
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#3 |
 Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: 1990-1990 C4 Corvette Front Air Bag Warning Light On
Before you start checking yellow SIR wiring, make sure you disarm the system, first.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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11-25-2019
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#4 |
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Join Date: Oct 2013
Location: England
Posts: 35
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Re: 1990-1990 C4 Corvette Front Air Bag Warning Light On
Kenny
Yes, the seat belt light is on. Thanks for your help. Pat |
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11-25-2019
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#5 |
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Join Date: Oct 2013
Location: England
Posts: 35
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Re: 1990-1990 C4 Corvette Front Air Bag Warning Light On
Hib
How do I disarm the system. Thanks for your help. Pat |
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11-25-2019
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#6 |
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Join Date: Oct 2017
Location: TX
Posts: 1,969
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Re: 1990-1990 C4 Corvette Front Air Bag Warning Light On
Pat,
My experience is that when you locate the issue with the air bag system, the seat belt light will most likely go out also. If you have already done the re-grounding of the sensors, I would definitely go to the wiring connectors next. I have recently had this issue with mine. I always take the battery cables loose before touching anything in the air bag system. Let it sit dis-connected for a while. I generally give it an hour or so before proceeding. Not sure if this is the "approved" procedure, but I was told by someone with more knowledge than me that this would work. If this is not the "approved" procedure I hope someone will chime in so we can add to our knowledge.
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Kenny 1990 #442
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11-25-2019
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#7 |
 
Join Date: Dec 2005
Location: Delanson, NY
Posts: 910
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Re: 1990-1990 C4 Corvette Front Air Bag Warning Light On
Kenny is right. Be careful when working with the SIR system. Very easy to trigger the airbags. I always disconnect the battery and let it sit for a day to discharge the capacitors in the system.
Have you read the codes for the SIR system? The codes will send you in the right direction. If I had to guess the ground on the right side sensor may have a bad ground. Water from the AC system drips on the sensor causing them to lose ground. Check the how to section on this site for help.
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1968 convertible Lemans Blue, 1986 coupe Medium Blue NCRS Top Flight (sold), 1990 ZR1 #2529 Red NCRS Regional and National Top Flight (sold), 1990 ZR1 #2124 Charcoal Metallic NCRS Top Flight 2010 & 2018, 2003 Anniversary Red Convertible (sold) |
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