Quote:
Originally Posted by JFP in PA
Error code 21: Airbag Ignition Circuit Driver fault
This means the car's computer has detected an open circuit, short, or communication failure with the driver's side airbag, indicating it may not deploy in a crash.
Most Likely Causes & Fixes
1. Faulty Clock Spring (most common)
2. Corroded or Loose Wiring
3. Low Voltage or Dying Battery
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Thanks for the details JFP. My battery is good and the wiring appears good also.
I just happen to have a spare clock spring so I did a continuity test on it and am puzzled by the results... I get continuity from either pin on the harness connector to either pin of the airbag connector. The clock spring that was in the car gives the same results. Does this mean both are defective? I bought the spare one used a couple of years ago when I had a horn problem. I found a broken ground wire which I fixed. I can't remember if I put the fixed original back on the car our if I used the "new" one.
Update - after watching this video
https://www.youtube.com/watch?v=-UgL22uM8Tk
I learned that the connector shorts out the pins on the harness connector, so the above behavior is normal.