Malfunction of SRS Restraint System W639

[AMG33D]

Hello, I am seeking assistance.
I installed new discs, pads, and a calliper, but when I returned to the vehicle for a test drive...
Initially, the red SRS light illuminated upon key insertion. Subsequently, at the first turn, a message indicating an SRS Restraint System failure prompted a workshop visit, accompanied by various clicking sounds, flickering driving lights, and intermittent dashboard illumination.
I have attempted to detach the battery for many minutes and conducted a cursory inspection to see if the electrical socket, presumably for the airbag, under the passenger seat remains attached.
I am somewhat perplexed, since I have just used the brakes and have not interacted with the wiring or the engine compartment, except than replenishing the brake fluid.
Assistance required.

[bvlenci]

Do you own a code reader, such as STAR or iCarsoft?

[AMG33D]

Hello, I own a MAXIECU but am seeking a mobile technician equipped with a STAR reader in the Essex region, namely Braintree. I hope they can use it as an ignition, since one click activates flashing lights and sounds!

[AMG33D]

It was only a virtually depleted battery.
I feel foolish, but at least I spotted it before contacting anybody. 😅

[Trevorseaf]

Common error!

[Trevorseaf]

😅