Not wiring
add The commonest cause of circuit failure occurs at junctions - plugs and sockets, wiring joints. Almost always due to corrosion, and overheating which rapidly causes more corrosion. And having first checked the fuse or circuit breaker.
Actual failure of components such as light bulbs, or an overheated motor. Rodents chewing cables are not common.
a short in you wiring harness
A disconnection in your wiring. loose wiring.
Bad wiring connection or internal wiring connection in the stereo
Start with fuses then bulbs then wiring.
Wiring or bad bulbs
water in the wiring or a low battery
Fuse, bulbs, switch, wiring.
Check VSS or wiring to it could cause fault .does speedometer work?
Yes, along with switch, wiring, relay, motor,
No. Poor wiring practices are the cause of many serious house fires.
PartialThe most likely cause is the wiring during the install. Check your wiring diagram against all of your previous work with the air bag. There are lots of sensors on new cars and the wires can be confusing.
A common cause for a gas gauge to stop working in a 1994 Ford Aspire is a defective fuel gauge. Lose wiring in the dash is another cause.