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Androids have an LED on the side of their face. The color of the LED is mainly blue but sometimes switches to yellow or even red.

android LED in Detroit

What does the color mean exactly?

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This is indicator for Androids health and emotions for deviants.

Emotions:

As an indicator of emotion in deviant androids, blue is indicative of calm or contented feelings, yellow indicates apprehension and caution, and red indicates abnormal intensity in emotions, including anger, sorrow, and deception.

Health:

some functioning androids devoid of emotions in the junkyard have LED lighting in red and are missing several major biocomponents.

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Androids suffering from an extreme shortage of power may have their LED showing incomplete red ring, which shrinks until it is shut down.

Source - Detroit Wiki

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    Just as a minor extension to the otherwise completely correct answer: before the events of the story, humans were aiming for their androids to be as stoic/unemotional as possible. The LED serves as a "check engine" light, to alert people of android being in an "undesirable" state.
    – Flater
    Nov 7, 2020 at 11:37
  • This answer is incomplete. The LED color also changes according to mental processing. You can read more about it on the Detroit Wiki (linked) and on my answer.
    – Brhaka
    Nov 9, 2020 at 9:12
  • @Brhaka it doesn't change color though. The question was about the color.
    – arghtype
    Nov 9, 2020 at 18:02
  • @arghtype According to the wiki, it does rarely change the LED color.
    – Brhaka
    Nov 9, 2020 at 18:44
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It lights up in blue, yellow and red according to the amount, strain, and quality of an android's mental processing, physical condition, and emotions (in deviants). It will always indicate the worse condition of both mental and physical aspects. It also functions as an identifier of androidhood.

The color changes immediately according to their conditions, although it is rarely seen changing gradually along the LED ring.

In case the LED is flickering that indicates rapid or unbalanced activity, while a constant LED indicates a stable level of activity.

You can read more about it here.

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