Fault code 21 points to the steering wheel - likely an open connection to the airbag on the wheel, usually the clock spring.
Fault code 20 -- Status lead, signal converter -- Short to ground
1. Pull plug I off the alarm system control module.
2. Pull off the plug on the signal converter for the transponder.
3. Ohmmeter at alarm system control module plug 1 pin 12 and ground,
Display: Infinite ohms
If display < 5 ohms check wiring harness for chafing and pinching damage.
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