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

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MODEL 207, 212 up to model year 2012 YoM 11 

Shown on model 212 with 4-spoke design steering wheel 

Fig 1: Airbag Unit On Steering Wheel Remove/Install Components - Shown On Model 212 With 4-Spoke
G09978091Courtesy of MERCEDES-BENZ USA

Shown on model 212 with 3-spoke design steering wheel 

Fig 2: Airbag Unit On Steering Wheel Remove/Install Components - Shown On Model 212 With 3-Spoke
G09978092Courtesy 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
NOTES Notes on performing repair, body work and welding on vehicles with airbags or emergency tensioning retractor units   AH91.00-P-0002-01M
IMPORTANT Assessment of airbag and emergency tensioning retractor units in accident vehicles   AH91.00-P-0006-01B
IMPORTANT Legal regulations on handling and storing airbags and emergency tensioning retractor units   AH91.00-P-0004-01A
1 Place steering column in the central height position    
2 Disconnect ground line at the on-board electrical system battery   AR54.10-P-0003EW
3 Insert screwdriver bit into openings (arrows) on steering wheel (2) and unscrew bolts on driver sidebag unit (1) IMPORTANT The screws remain on the steering wheel (2).  
TORQUE SPECIFICATION *BA91.60-P-1005-01M 
SPECIAL TOOL Fig 3
4.1 Remove driver airbag unit (1) from steering wheel (2) until electrical connectors (7 or 8) are accessible For steering wheel in 3-spoke design  
4.2 Remove driver airbag unit (1) from steering wheel (2) until electrical connector (6) is accessible For steering wheel in 4-spoke design  
5 Disconnect electrical connectors (7) On model 212 with 3-spoke design steering wheel  
6 Disconnect electrical connector (6) For steering wheel in 4-spoke design  
7 Disconnect electrical connector (8) For steering wheel in 3-spoke design  
8 Remove driver airbag unit (1) from steering wheel (2) until electrical connectors (5) are accessible    
9 Release lock tabs (4) and disconnect electrical connectors (5) NOTES Never disconnect electrical connectors (3) with electrical connectors (5) connected, because otherwise the driver airbag unit (1) may be triggered.  
SPECIAL TOOL
INSTALLATION IMPORTANT The electrical connectors (5) must audibly engage when being plugged onto driver airbag squib 1 (R12/13) and driver airbag squib 2 (R12/14).
Figure
10 Disconnect driver airbag unit (1) from steering wheel (2) If driver airbag unit (1) is being replaced, the defective driver airbag unit (1) must be disposed of properly.
See:
 
REFER TO FORMS Notes on disposing of airbag and emergency tensioning retractor units OS91.00-P-0001-01A
11 Install in the reverse order    
12 Check supplemental restraint system (SRS) with STAR DIAGNOSIS IMPORTANT After replacing the driver airbag unit (1).  
REFER TO SELF-DIAGNOSTIC SYSTEMS Connect STAR DIAGNOSIS and read out fault memory AD00.00-P-2000-04A
AIRBAG

Number Designation Model 207 Model 212
BA91.60-P-1005-01M Bolt, airbag to steering wheel Nm 7 7
Fig 3: Identifying Screwdriver Bit (126 589 00 10 00)
G09978093Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Removal Lever (203 589 04 33 00)
G09978094Courtesy of MERCEDES-BENZ USA