Replacing Occupant Detection Control Unit

NOTIFICATION 

Voltage drop 

• Risk of irreparable damage to control unit 
• Risk of damage to control unit 
• Fault entries in the control unit 
• Coding in the control unit is aborted 
• Malfunctions in control unit, even during programming 

  → Prior to disconnecting the control unit, switch off ignition and remove ignition key.

  → Ensure that the power supply is not interrupted during programming.

  → Connect a battery charger with a current rating of at least 90 A to the vehicle battery.

Information 

The PIWIS Tester  instructions take precedence since the description may be different with later Tester releases.

The procedure described here has been structured in general terms. Different text or additional information may appear on the PIWIS Tester  .

1. Connect the Tester to the vehicle and start it. Switch on ignition.
2. Select vehicle type.
3. In the overview,  select the Airbag  control unit and press F12.

   Information 

   • No entries are required under this menu item. 
4. Select 'Reset occupant detection learning values on passenger's side'  in the Drive links/checks  menu and press F12 to continue.
5. Start the function  by pressing F8
6. The message "Function has been executed"  appears. Press F11 to go back.

   Information 

   • No entries are required under this menu item. 
7. Select 'Re-teach occupant detection on passenger's side'  in the Drive links/checks  menu and press F12 to continue.
8. Start the function  by pressing F8
9. The message "Function has been executed"  appears. Press F11 to go back.
10. Read out fault memory and erase it if necessary.
11. Perform function test: Switch the ignition off and then on again. The airbag warning light in the instrument cluster comes on and must go off again after a few seconds.