California

NOTE: Diagnostic Module (OBD) fault codes can be extracted via Push-button and LED [1][2]Diagnostic Connector (X11/21s1) or with special tools (Mercedes HHT or impulse counter scan tool). All other Control Modules require special tools for extracting and clearing fault codes.

Diagnosis with Push-button and LED X11/21s1 (Only possible with Diagnostic Module DTC's on California Vehicles)
1. Extract fault codes from Diagnostic Module (N59) via Push-button and LED [1][2]Diagnostic Connector (X11/21s1). Refer to "How to Read Diagnostic Trouble Codes (DTCs)" under the system to be diagnosed.
2. Find correct fault code/diagnostic trouble code (DTC) in code chart and test suspect circuit or component as indicated in the "Test Step/Remedy" column.
3. Repair defective circuit or component.
4. Erase fault codes from Diagnostic Module.
5. Test drive vehicle and recheck fault codes.

Diagnosis with HHT or Impulse Counter
1. Extract fault codes from each individual control module. Refer to "How to Read Diagnostic Trouble Codes (DTCs)" under the system to be diagnosed.
2. Find correct fault code (DTC) in the applicable code chart and test suspect circuit or component as directed in the "Test Step/Remedy" column of the code chart.
3. Repair defective circuit or component.
4. Erase fault codes from each individual control module. Refer to "How to Clear Diagnostic Trouble Codes (DTCs)" under the system to be diagnosed.
5. Test drive vehicle and recheck fault codes.