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HU850 stereo removal.

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Old Oct 14th, 2020, 18:25   #1
TomP1980
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Default HU850 stereo removal.

Good evening.

I'll be fitting a GROM USB connection to my stereo.

Are there any tips when removing the stereo?

I've watched a couple of youtube videos. Some suggest disconnecting the battery. Am I correct that the negative terminal should be disconnected first to prevent error messages?

Another video suggests disconnecting the battery whilst the key is in position 2?

Any advice appreciated.

Tom
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Old Oct 14th, 2020, 19:09   #2
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It doesn't matter which terminal is being disconnected first. The whole idea is to prevent from any mistake to touch the terminals and cause sparks. For the key in POSII and headlights ON when connecting and disconnecting the battery, some believe it can prevent a small thermistor from failing. https://youtu.be/cuEprePQbA8
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Old Oct 15th, 2020, 10:00   #3
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Whilst oragex's post above is correct - the recommendation is to remove the negative (black) connection first so if you do accidently slip with the spanner when undoing the positive (red) terminal you don't cause a short circuit with a cloud of sparks from a frying spanner near the battery.

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Originally Posted by JoeNinety View Post
Always disconnect the negative (black) terminal first.
Then put an old glove (or similar) on it.

(The reason for disconnecting the battery if swapping out the stereo is if you are disconnecting the climate control as well - this will cause an SRS error if battery is connected when you disconnect the climate control - you will then need VIDA or other suitable code device to reset)
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Old Oct 15th, 2020, 16:14   #4
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Thank you for the advice. I'll attempt next week. Wish me luck
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Old Oct 15th, 2020, 21:35   #5
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use one hand to turn the torx once you have got it loose, use the other hand to catch the bolt / screw or itll fall into the gearbox shifter never to be found
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Old Oct 15th, 2020, 21:36   #6
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if you have an auto you will need the battery connected in order to shift it out of park etc as required to manoiever the head unit out. IF you remove the climate panel while the battery is still on you will get SRS error so ideally dont do this unless you have a code reader that does the SRS module
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Old Oct 15th, 2020, 10:00   #7
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Always disconnect the negative (black) terminal first.
Then put an old glove (or similar) on it.

(The reason for disconnecting the battery if swapping out the stereo is if you are disconnecting the climate control as well - this will cause an SRS error if battery is connected when you disconnect the climate control - you wil then need VIDA or other suitable code device to reset)
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