Some of these organs serve important functions, such as maintaining heartbeat or temperature, where others are used to make the androids seem more human, such as lungs that simulate breathing. Missing or critically damaged vital biocomponents lead to shutdown or death. Biocomponents are often colored blue, due to Thirium or signalling; damaged components may light up red.
Each kind of biocomponent is produced and available in various models, termed with a four-digit name, sometimes plus one letter. Each such numbered part is compatible with varying android models, and incompatible with others.
An android's biocomponents can be exchanged for other biocomponent parts compatible with the android's model. At least some biocomponents are exchanged as easily as unplugging the old and plugging in the new part, which immediately resumes its function.
Certain biocomponents can be partially repaired through unconventional means such as stopping bleeding of Thirium 310 by a heated crowbar, as demonstrated by Lucy. The official means to investigate biocomponents is speculated to be carried out in room similar to operating theaters by individuals wearing isolation gowns.
There are biocomponent upgrades available for purchase that are meant to improve an android, e.g. stronger limbs than what come standard.
- Heart/Thirium pump: synthetic heart; located in left side of chest
- Thirium pump regulator: regulates heart; a roughly cylindrical plug, inserted ventrally below the sternum.
- Optical unit: eye
- Audio processor: plug inserted behind the ear (this does not have visual appearance of an ear, but a hardware component)
- LED: external feedback biocomponent and android identifier
- Limbs: different portions of limbs act as individual parts. For example leg is treated as a biocomponent, it is possible thigh is independent of leg.
- Unnamed unit: A presumed central processing unit located at the skull position of human androids is vital for processing. It is mentioned multiple times if the inside of skull is critically damaged the android would stop functioning immediately, like a head injury for a human.
A list of biocomponents, their numbered versions, and their compatible android models as well as appearances in the world of Detroit: Become Human.
|#8087q||optical unit||AK700 in From the Dead|
|#A754h||optical unit||VX500 in From the Dead|
|#9745h||optical unit||VX500 in From the Dead|
|#9474||thirium pump regulator||PB600 in From the Dead|
|#2886||thirium pump regulator||WE900 in From the Dead|
|#4903||audio processor||LA900 in From the Dead|
|#4507||audio processor||GT100 in From the Dead|
|#4807||audio processor||GT100 in From the Dead|
|#6847j||limb, right leg component||TE900 in From the Dead|
|#6312t||limb, right leg component||AF200 in From the Dead|
|#8427g||limb, left leg component||AC900 in From the Dead|
|#9301||LED||Rupert in The Nest|
|#5402||Traci in The Eden Club|
|#6970||Traci in The Eden Club|
|#8451||thirium pump regulator||JB300 in Public Enemy|
|#8456w||thirium pump regulator||Connor in Public Enemy|
|#4717g||PL600 & HK400 in Last Chance, Connor|
|#3983v||PL600 in Last Chance, Connor|
|#9164x||PL600 & HK400 in Last Chance, Connor|
|#3251m||HK400 in Last Chance, Connor|
|#8067k||PL600 in Last Chance, Connor|
|#6755w||Traci in Last Chance, Connor|
|#1503s||Traci in Last Chance, Connor|
|#1101j||Traci in Last Chance, Connor|
|#2208n||Traci in Last Chance, Connor|
|#9402r||Traci in Last Chance, Connor|
|#2477p||Traci in Last Chance, Connor|
|#2104y||PL600 in Last Chance, Connor|
|#1604t||PL600 in Last Chance, Connor|
|#1009d||PL600 in Last Chance, Connor|
|#9782f||Connor & Kara in Battle for Detroit|
|#0351k||Kara in Battle for Detroit|
|#2657g||Kara in Battle for Detroit|
|#1995r||Connor & Kara in Battle for Detroit|
|#7511p||Connor & Kara in Battle for Detroit|
- As a plot point, it can be reasonably viewed that the player controls the unnamed unit, assuming it is indeed a central processing unit.