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Home >> Mercedes Benz >> 1993 >> 400E >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Air Bag Restraint System) >> Diagnosis & Testing >> SRS Self-Diagnostic Check (500SEL) >> Retrieving Fault Codes: Impulse Tester (124-589-19-21-00)

Retrieving Fault Codes: Impulse Tester (124-589-19-21-00)

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. Locate vehicle round diagnostic connector in engine compartment. See ON-BOARD DIAGNOSTIC CONNECTOR LOCATION  table. See Figure . Insert Diagnostic Connector Adapter (140-589-63-00) into vehicle round diagnostic connector.
  2. Using Impulse Tester (124-589-19-21-00), connect tester Yellow probe to diagnostic connector adapter terminal No. 30. Connect other tester probe to diagnostic connector adapter terminal No. 1 (ground).
  3. Ensure all SRS electrical connections are connected and secure. Battery voltage must be greater than 11 volts. Turn ignition switch to ON position. Display "U-BATT" should appear on impulse tester display. This display indicates impulse tester and voltage supply for impulse tester are okay.
  4. Press START button on impulse tester for exactly 3 seconds. Note and record first fault code readout on tester display. If START button on impulse tester is pressed for longer than 6 seconds, fault code to be displayed will be erased.
  5. Press START button on impulse tester again for exactly 3 seconds to read and record second fault code. Repeat sequence of reading and recording until first fault code repeats. See appropriate SRS FAULT CODES  table. Turn ignition off. Remove tester.
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