All of my interior lights aren't working (courtesy lamps, vanity lights, glove box, reading lamps, etc.) I have checked fuses and bulbs but haven't...

Hello and welcome to ExpertHelp.com! My name is Relly De Jesus and I'm going to do everything in my power to answer your question to your full satisfaction!

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Hello Bob

How are you doing? As a first course of action, please try to remove the negative battery connector of the vehicle and let it sit for 5 minutes or more before reconnecting it. This should reset the car's BCM (body control module) and can get it back to it's normal operating state. 

I'll be standing by for your response and goodluck!

Thank you

Relly

Hello Bob.. good to hear back from you. Yes I would check the inadvertent power relay and replace it if necessary. I'll be standing by.

Thank you

Relly

I'm not great on electrical Bob but when I check the relay... I usually get a new one and plug it to the slot that I suspect faulty. Please let me know of the result

Hello Bob

How are you doing? This is a follow up regarding my assistance. Is there anything else I can add or help you with? Hope you find it helpful and please keep me posted on the progress. I'll be waiting for your response.

Thank you

Relly

Hello Bob

May I ask the exact year and model of your Cadillac? I'll be standing by for your response

Thank you

Relly

Thank you for your response Bob... The BCM tends to fail on this car and sometimes it affects other electrical functions as well. The body control module or 'body computer' is a generic term for an electronic control unit responsible for monitoring and controlling various electronic accessories in a vehicle's body. This may require replacement to resolve the issue Bob. Below is what it looks like and it's location.

It is labeled number 7 on the Diagram Bob. Hope this helps and please let me know if there's anything else I can add Bob. I'll be standing by for your response.

Thank you

Relly

Hello Bob

How are you doing? This is a follow up regarding my assistance. Is there anything else I can add or help you with? Hope you find it helpful and please keep me posted on the progress. I'll be waiting for your response.

Thank you

Relly

You're most welcome Bob and goodluck. I'll be standing by for your response. Thank you and have a nice day!

Relly

Hello Bob... how are you doing? Hope everything is well. Any update on the car? 

Yes indeed Bob. Just follow the part number 7 in the diagram

Hello Bob.. please let me know after you replace the BCM. Goodluck!

Hi Bob

Good to hear back from you... Last time I remember removing the BCM is through the trunk. Please open the trunk and remove the hush carpetting then you remove the rear panel. The BCM location is just at the back of the backseat. I'll be standing by and goodluck.

Relly

Hello Bob

Good to hear back from you... the interior lights should be working by now. Will ask my fellow mechanics of other possibilities Bob. Will get back to you tomorrow. 

Thank you

Relly

Hi Bob

Do you happen to have a new fuse block and relay on hand? Replacing the bcm should have resolved the issue but it's best to check the fuses and relays. Get a new fuse and relay and try to interchange it to the ones installed. Be sure that your interior light is on so that when you insert the new relay or fuse the lights will turn on. I'll be standing by.

Thank you

Relly

Hello. Good to hear back from you. No worries with that Bob. I'll be messaging you from time to time as well. Goodluck Bob! Thank you