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Retrieving Fault Codes

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NOTE: Fault codes may only be retrieved using Hand-Held Tester (965 589 00 01) and Adapter (965 589 00 40 or 965 589 00 50).
  1. Check vehicle fuses. Replace any blown fuses as necessary. Ensure vehicle battery voltage is 11 volts or more. Ensure SRS warning light functions. Turn ignition off. Connect Hand-Held Tester (HHT) (965 589 00 01) to Data Link Connector (DLC).
  2. DLC is located in right rear corner of engine compartment. It may be necessary to use Adapter (965 589 00 40 or 965 589 00 50) to connect HHT to DLC. After HHT displays module number and version, press return key to start diagnosis. Using HHT, follow HHT prompts to retrieve SRS fault codes. For SRS control modules beginning with number 000, fault code 1 is valid. For SRS control modules beginning with number 001, fault code 2 is valid. See DIAGNOSTIC TROUBLE CODE LIST .
  3. HHT will display a 3 digit fault code, and may display additional graphic information. This additional graphic information will help in diagnosis of fault code. See Fig 1. During diagnosis HHT will display 4 different graphic displays informing technician if a test passes or fails, or if seat belt buckle is latched or not latched. See Fig 1.
  4. These graphic displays are displayed as applicable by HHT during testing. See DIAGNOSTIC TROUBLE CODE LIST table. During diagnosis, system values are continuously updated, so by moving components and connections intermittent failures can be diagnosed. HHT will also display fault frequency and time span.
  5. After retrieving fault codes using HHT, carefully observe testing instructions in this article. Some testing is executed with HHT connected to DLC and some tests are executed with HHT removed from DLC. Turn ignition off when removing or connecting HHT to DLC.
  6. Contact Box (124 589 00 21) with Test Cable (124 589 35 63) is necessary to complete some test steps. Resistance Substitution Unit (124 589 09 63) is necessary to substitute resistance values for testing purposes.
Fig 1: Hand Held Tester Graphic Information (2000 Models)
G99B00936Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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