Radio Interference For RF Keys (80.57/21)

Publication date: 2003-02-25
Reference number: 80.57/21

RADIO INTERFERENCE FOR RF KEYS

TECHNICAL SERVICE BULLETIN

Reference Number(s): T-B-80.57/21, Date of Issue: February 25, 2003

MERCEDES-BENZ:	Models 163 and 463
GROUP:	80.57 - Drive authorization system (DAS)

SUBJECT

Radio Interference for RF Keys

SERVICE INFORMATION

A number of different RF operated systems are active such as cordless headphones, garage door openers, remote reading thermometers, etc. when active, operate within the frequency range of the remote control key. These transmitters operate with several times the power output of the key or card whose frequency and power output is limited by size.

If one of the above mentioned RF operated systems is located near the vehicle and is active, strong interference could be present which occasionally could prevent the vehicle from being locked/unlocked.

In such circumstances, model 163 vehicles (which are only equipped with an RF remote key) can be locked/unlocked using the mechanical key. The model 463 has an IR system in parallel to the RF system so the vehicle can be locked/unlocked from a short distance at any time.

This is not an indication of a defect, merely the limitations of operation in the presence of other stronger radio frequency emitters. If the customer experiences this circumstance, please explain the cause.