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Retrieving Fault Codes

WARNING: This page is about a different car, the 1997 Mercedes-Benz E420, 1997 Mercedes-Benz E320, and 1997 Mercedes-Benz E300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Fault codes may only be retrieved using Hand-Held Tester (6511 0001 99) and Adapter (140 589 1463 00).
  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) (6511 0001 99) to Data Link Connector (DLC).
  2. DLC is located in right rear corner of engine compartment. It may be necessary to use Adapter (140 589 1463 00) 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.
  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.
    Fig 1: Hand Held Tester Graphic Information
    G96B14143Courtesy of MERCEDES-BENZ OF NORTH AMERICA
  4. These graphic displays are displayed as applicable by HHT during testing. See appropriate 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.
    DIAGNOSTIC TROUBLE CODE LIST (WITH SIDE AIR BAG)

    Code Possible Cause Go To Test Step
    001 SRS Control Module (N2/2) 2.0, see SRS & ETR Diagnosis Test 1.0-3.1 
    004 Driver Air Bag Squib (R12/3) 3.0, see SRS & ETR Diagnosis Test 1.0-3.1 ; 4.0, see SRS & ETR Diagnosis Test 4.0-5.1 
    005 Driver ETR Squib (R12/1) 5.0, see SRS & ETR Diagnosis Test 4.0-5.1 
    006 Passenger ETR Squib (R12/2) 7.0, see SRS & ETR Diagnosis Test 5.2-7.0 
    007 Passenger Air Bag Squib (R12/4) 9.0, see SRS & ETR Diagnosis Test 9.0-9.2 ; 10.0, see SRS & ETR Diagnosis Test 9.3-10.0 
    008 Side Air Bag Squib (Driver-Side) 17.0, see SRS & ETR Diagnosis Test 16.0-17.0 
    009 Side Air Bag Squib (Passenger- Side) 18.0, see SRS & ETR Diagnosis Test 17.4-18.1 
    003 Voltage Supply Circuit 15R (Low Voltage) 1.0, see SRS & ETR Diagnosis Test 1.0-3.1 
    002 SRS Warning Light (A1e15) 11.0, see SRS & ETR Diagnosis Test 11.0-13.0 
    016 Driver Belt Switch (S68/3) 12.0, 13.0, see SRS & ETR Diagnosis Test 11.0-13.0 
    018 Driver Air Bag Harness 19.0, see SRS & ETR Diagnosis Test 19.0-20.1 
    019 Driver Air Bag Sensor Replace Sensor
    020 Driver Air Bag Sensor Replace Sensor
    021 Passenger Air Bag Sensor 20.0, see SRS & ETR Diagnosis Test 19.0-20.1 
    022 Passenger Air Bag Sensor Replace Sensor
    023 Passenger Air Bag Sensor Replace Sensor
    024 & 025 Passenger Seat Occupation Signal -
    032 & 033 Communication Interference -
    073 Squib Short Circuit 16.0, see SRS & ETR Diagnosis Test 16.0-17.0 
    DIAGNOSTIC TROUBLE CODE LIST (WITHOUT SIDE AIR BAG)

    Code Possible Cause Go To Test Step
    001 SRS Control Module (N2/2) 2.0, see SRS & ETR Diagnosis Test 1.0-3.1 
    002 Driver Air Bag Squib (R12/3) 3.0, see SRS & ETR Diagnosis Test 1.0-3.1 ; 4.0, see SRS & ETR Diagnosis Test 4.0-5.1 
    003 Driver ETR Squib (R12/1) 5.0, see SRS & ETR Diagnosis Test 4.0-5.1 
    004 Passenger ETR Squib (R12/2) 7.0, see SRS & ETR Diagnosis Test 5.2-7.0 
    005 Passenger Air Bag Squib (R12/4) 9.0, see SRS & ETR Diagnosis Test 9.0-9.2 ; 10.0, see SRS & ETR Diagnosis Test 9.3-10.0 
    017 Voltage Supply Circuit 15R (Low Voltage) 1.0, see SRS & ETR Diagnosis Test 1.0-3.1 
    019 SRS Warning Light (A1e15) 11.0, see SRS & ETR Diagnosis Test 11.0-13.0 
    020 Passenger Seat Occupation Signal -
    024 Driver Belt Switch (S68/3) 12.0, 13.0, see SRS & ETR Diagnosis Test 11.0-13.0 
    025 Passenger Belt Switch (S68/4) 14.0, 15.0, see SRS & ETR Diagnosis Test 14.0-15.0 
    073 Squib Short Circuit 16.0, see SRS & ETR Diagnosis Test 16.0-17.0 
  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 00) with Test Cable (124 589 35 63 00) is necessary to complete some test steps. Resistance Substitution Unit (124 589 09 63 00) is necessary to substitute resistance values for testing purposes. See SRS & ETR DIAGNOSIS under DIAGNOSTIC TESTS .
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