Mercedes-Benz ML 320/350 1998-2005 Air Bag Restraint System Service Manual (P/N 4JGAB54E4WA006422)

• Covers 1998–2005 Mercedes-Benz ML320 and ML350 models equipped with the Supplemental Restraint System (SRS), documenting airbag diagnostics and restraint system component maintenance
• Official Mercedes-Benz OEM publication, P/N 4JGAB54E4WA006422, first edition
• 100-page technical reference containing 44 wiring diagrams and 44 system troubleshooting charts for all SRS and Emergency Tensioning Retractor (ETR) components

SRS and Restraint System Documentation

This factory-authorized manual provides technical descriptions and operational theory for the Supplemental Restraint System and ETR assemblies found in the ML320 and ML350. It details the mechanical and electrical architecture. The text breaks down control module functions, side impact sensors, and both driver and passenger airbag modules. You will find specific service precautions and post-collision inspection procedures. It outlines component replacement schedules alongside rigid safety guidelines for handling live airbag units and tensioners. Detailed notes on the clockspring assembly, control module, and side-impact units ensure technicians know the exact connection and mounting protocols. For instance, it specifies the precise rivets required for side airbag installations.

Diagnostic Reference and Electrical Specifications

The diagnostic section maps out fault code retrieval using the factory Hand-Held Tester (HHT) and the required adapter cables for the vehicle's diagnostic link connectors. Step-by-step tests evaluate driver and passenger squib resistance, seat buckle switch connectivity, and sensor functionality. The manual lists nominal resistance values and exact multimeter connection points. SRS electrical resistance for ETR and airbag squibs is firmly documented at 2 to 5 ohms in the testing charts. The text also verifies the control module ground connection via specific diagnostic pins. Furthermore, it establishes that harness replacement is mandatory if any wiring components show damage during fault isolation. Working on active restraint systems carries inherent risks, requiring strict adherence to factory safety protocols to prevent accidental deployment. The provided information outlines system parameters specifically for qualified technicians analyzing the vehicle's passive safety network.