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Home >> Mercedes Benz >> 2007 >> R63 >> Repair and Diagnosis >> Restraints >> Seat Belts >> Seats, Bunks, Restraint Systems - 251 Chassis - 1 Of 2 >> Testing & Repair >> Remove/install airbag unit on the steering wheel >> Remove/install airbag unit on the steering wheel - AR91.60-P-0660RT

Remove/install airbag unit on the steering wheel - AR91.60-P-0660RT

MODEL 251 up to model year 09 

Fig 1: Identifying Steering Wheel Airbag Unit Remove/Install Components
G10123091Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
DANGER Risk of injury  caused by performing testing or repair work on airbag or emergency tensioning retractor units. Store airbag units with deployment side facing up; do not expose to temperatures greater than 100°C. When working on these units, disconnect the power supply. AS91.00-Z-0001-01A
DANGER Risk of explosion  caused by escaping oxyhydrogen gas. Risk of injury  caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte (contains diluted sulfuric acid) or metal spatter due to short circuit. Risk of burn injuries  caused by short circuit. Risk of poisoning  caused by swallowing battery electrolyte (contains diluted sulfuric acid) or absorption of lead over the skin or orifices No fire, sparks, open flames or smoking. Wear acid-resistant gloves and clothing and safety glasses with side guards.
Do not place any conductive objects on the battery and avoid any short circuit from battery positive to ground.
Only fill liquid battery electrolyte (diluted sulfuric acid) into suitable and appropriately marked containers.
AS54.10-Z-0001-01A
NOTES Notes on performing repair, body work and welding on vehicles with airbags and ETR units   AH91.00-P-0002-01M
NOTES Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
IMPORTANT Assessment of airbag and belt tensioner units in accident vehicles   AH91.00-P-0006-01B
IMPORTANT Legal requirements on handling and storing airbags and emergency tensioning retractor units   AH91.00-P-0004-01A
1 Disconnect jump-start sources or connected battery charger IMPORTANT If connected.  
2 Turn steering wheel (1) to straight-ahead position    
3 Disconnect battery ground line   AR54.10-P-0003RT
4 Insert screwdriver bit into openings (arrows) at back of steering wheel (1) and remove screws from driver airbag unit (2) TORQUE SPECIFICATION *BA91.60-P-1001-01K 
SPECIAL TOOL Screwdriver bit Figure
5 Lift driver airbag unit (2) off the steering wheel (1) and disconnect electrical connector (3, 4) SPECIAL TOOL Removal lever
INSTALLATION IMPORTANT Electrical connector (3, 4) must be heard to engage when being plugged in.
Fig 3
6 Disconnect driver airbag unit (2) from steering wheel (1) IMPORTANT If the driver airbag unit (2) is replaced, the defective unit must be disposed of properly.
 
REFER TO FORMS Notes on disposing of airbag and emergency tensioning retractor units All models OS91.00-P-0001-01A
7 Install in the reverse order    
8 Check restraint system using STAR DIAGNOSIS diagnostic system    
REFER TO SELF-DIAGNOSTIC SYSTEMS Connect STAR DIAGNOSIS and read out fault memory   AD00.00-P-2000-04A
AIRBAG

Number Designation Model 251 except USA version (code 494a)
BA91.60-P-1001-01K Bolt, airbag to steering wheel Nm 8
Fig 2: Identifying Screwdriver Bit (126 589 00 10 00)
G07304961Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Removal Lever (203 589 04 33 00)
G07304958Courtesy of MERCEDES-BENZ USA