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Testing ETR Unit & Harness (500SL)

WARNING: This page is about a different car, the 1993 Mercedes-Benz 500SEL and 1993 Mercedes-Benz 500E. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure ignition switch is in OFF position. Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM  .
  2. Locate ETR test connector (X11/7) under passenger footrest panel. See Figure and Figure . Disconnect ETR connector (X11/7) from SRS Red 10-pin connector (X11/13).
  3. To determine if ETR unit or related wiring is faulty, use high impedance DVOM or M-B Multimeter (124-589-19-21-00) to probe ETR connector terminals. See Figure . Probe ETR connector terminals as per "test connection" column of diagnostic chart. See Fig 1 .
  4. To determine if ETR/seat connection, wiring or ETR unit is faulty, use high impedance DVOM or M-B Multimeter (124-589-19-21-00) to probe ETR/seat connection. ETR/seat connections (X28/8 and X28/9) are located under each seat. See Figure .
  5. After performing appropriate replacements, activate air bag. Ensure system is functioning properly. See SYSTEM OPERATION CHECK  .
Fig 1: ETR Diag. Chart For Testing ETR Units & Wiring Conn. (500SL)
G92C21354Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 2: ETR Connector Terminal Location (500SL)
G92E21356Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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