What year/make/model is your car?
It's not in the door jamb. It's on a plate attached to the left front hinge pillar below the upper hinge [driver's side] at about the same level as the switch that turns on the interior lights when opening the door.
That's where it is on my 67 2+2.
"Dad, which car are we taking?" "The Pontiac!"
"Which one?" "The red one!"
'67 Parisienne 2+2 - red
'01 Montana - red
'06 Buick Allure
'12 Japanese minivan
