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2001 740I alarm system

Discussion in 'E38 (1995-2001)' started by Bcary, Dec 14, 2010.

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    Bcary

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    When the car is locked the alarm system on my 2001 740i goes off arbitrarily and for no apparent reason (nothing touching the car). What causes this and is it easy to correct?
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    • Technical Service Advisor

    mooseheadm5

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    Most common cause is the hood switch. The only way to tell is to scan the car to see what sensor caused the alarm to activate.
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    Bcary

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    can you tell me what you mean by the "hood switch" ?
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    mooseheadm5

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    It is the switch that tells the alarm system that the hodd is closed. I think it is located near the driver's shock tower on that car.
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    Bcary

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    How do you scan the sensor ... does that require specialized equipment only a dealer or service provider would have ?
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    • Technical Service Advisor

    mooseheadm5

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    You have to scan the car through the diagnostic port. A good independent service provider can do it.

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