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A door knob turns to let people open or close the door. For vehicles, a lever or button-lever opens the door. For swinging doors, body weight (pushing) opens a door.
The problem is that the inside door handle is broken. Although the inside door handle needs replacement you can still open the door by pulling on the lock lever above the handle.
beside the steering wheel on the left side. somewhat under the dash, there should be a handle, if broken..then there will be a wire. you just pull the handle/wire and it opens up the front compartment.
Usually, the switch has failed in the leftgate handle. The entire emblem/handle will need replaced.
The power on switch
A normally closed switch is a switch that is normally closed. When you operate it, it opens.
A mercury switch is an electronic switch that opens or closes a circuit when the switch, or device it is attached to, tilts.
opens and closes the circuit
Bolt
If it is just the plastic handle broken, behind that is the cable that opens the hood. Just grab the cable with a pair of pliers and pull. You can probably just replace the inside handle and not have to run a new cable.
I went crazy looking for the door jamb switch on my 2001 Denali. It's attached to the locking mechanism inside the door. The latch has a gear which drives a mating gear that activates the switch. When you pull the door handle, the latch opens and the gear moves.
A lever under the dash just to the left of the steering wheel. The other lever opens the hood.