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Mercedes 320 2003 -- I have a rapid chirping noise coming

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Mercedes(###) ###-####-- I have a...
Mercedes(###) ###-####-- I have a rapid chirping noise coming from the front right side. Disconnected battery and still have the noise. Prior to disconnecting battery, car would not unlock with remote, had to use key to enter and car would not start but the loud rapid chirping continues
Submitted: 1 year ago.Category: Mercedes
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Answered in 10 minutes by:
1/24/2016
Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago
Hipo64
Hipo64, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3,486
Experience: Work and diagnose electronics on daily basis.
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Hi and Welcome to Just Answer! How are you?

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

Remote may not work if battery voltage is too low or key fob battery is low or key fob is damaged

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

there is a red dot blinking when any button is depressed on the key fob (keyless entry transmitter)

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

Can you operate any of the buttons and observe if red light is flashing

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

make sure battery is charged and point your key to left door handle Infra red receiver, vehicle should unlock, this will pint to key battery problem.

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

if battery is disconnected but you can still hear chirping noise, then the Alarm horn was activated. it is located under wheel well cover behind passenger front wheel

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

the low chirping noise is explained as internal Alarm Horm battery is exhausted and has low charge, this one cannot be repaired and has to be replaced.

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

The signals for the radio remote-controlled central locking system are demodulated and digitized by amplifier module 1, window antenna (A2/71).

The data prepared thus are sent over a separate data line to the electronic ignition switch control module (N73) and forwarded there to the CAN interior (CAN-B).

During demodulation, the useful signal is separated from the high-frequency carrier frequency (transmitter frequency).

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

Mercedes Star dignostic Scan tool is used to monitor key signal, but I suggest you check if keyfob light is blinking when you press any key, if not replace keyfob battery first.

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Mercedes Mechanic: Hipo64, Mercedes Technician replied 1 year ago

Regards Pavlin!

Please Check and Let me know

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