The airbag light has absolutely noting to do with the engine starting unless it is because the airbag module is losing power at the same time that some engine component is losing power due to a defective ignition, battery, or ground circuit.
The best thing to do is to scan your computer network for possible fault codes that may lead you to the cause. Please note that I said "computer network", NOT engine control module. Most generic OBD code readers (like those used at many parts stores as a sales tool to sell you a bunch of stuff you don't need) cannot access anything but the continuous memory in the engine control module....you need to scan ALL modules.
SOURCE: Thermostat on 2002 Chevy Impala
the best thing to get is the Haynes manual for your car at advanced auto or autozone or somewhere like that and the book will tell you how to take everything apart and put it back. i think the manual is about $16.00
SOURCE: the airbag light came on and stayed on for no reason.
I have the same issue (which comes and goes often).
It is caused by a loose wire connection, used for the drivers side airbag located in the seat.. The connector for mine is located under the front drivers seat. There are a couple of connectors that are connected to a bar under the front of the seat. I don't recall which one is used for the Airbag sensor.
SOURCE: 2002 Chevy Impala Sensor # 3
You didn't give the engine size, so I'll give what my manual shows.
The 3.4L engine----- 2nd one in from the left, in back of the engine.
The 3.8L engine------2nd one in from the left, in front of the engine.
SOURCE: alarm wont dis arm on 2002 chevy impala
turn key on but don't start. let sit for 10 minutes or so and start engine.
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