Many GM vehicles have a glove box sticker showing the RPO (Retail Purchase Option) codes that can be used to decode most of the factory options that were installed on the car at build time. For example, if your RPO sticker shows an option of K05, there was an engine block heater installed at the factory. U11 would indicate that there was a Police Packace instrument cluster and certified speedometer. You can search the web for 'RPO Codes" to find more info for your specific vehicle.
It is in the glove box. You will have to call the dealer after retrieving these codes they will be able to identify the exact one.
In almost EVERY GM vehicle I've seen it's mounted in the dashboard, to the right of the glove box. But in fairness, I haven't worked on a 1990 Sierra.
It's in the glove box.
Inside the vehicle passenger side under glove box. Remove plastic fairing with two bolts..
in glove box
in your glove box
That depends on the laws of your state.
the engine computer is located behind the glove box. remove the glove box door and inside. you will see it on top of the H-VAC
behind glove box. black coax looking cable
call a Honda dealership and they will look your model up in their system and assist you over the phone. Simply open the glove box the radio code is on a tab on the glove box door.
I believe in the 2001 models it is located inside the vehicle behind the glove box. You will need to remove the glove box door to gain access.
Remove the dash. It bolted to the firewall directly behind/above the glove box.