Reading And Writing Values For AWS Control Unit

Information 

The PIWIS Tester II 9818  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 additions may appear in PIWIS Tester II 9818  .

1. Replace control unit. → 696819 REMOVE AND INSTALL AWS CONTROL UNIT 
   NOTE: 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 → Nominal value: 40 A to the vehicle battery.

2. Connect battery charger to the vehicle.
3. Seat calibration position  Move passenger's seat longitudinally until flush with the seat rails and to its lowest position.
4. Connect the Porsche System Tester PIWIS Tester 9718  to the vehicle and start the System Tester. Switch on ignition. Press [>>] to continue.
5. Select vehicle type.
6. Switch from the vehicle type to the list of control units [>>].
7. Select AWS  with the cursor keys and press the [>>] key.
8. Select Control unit replacement  with the cursor keys and press the [>>] key.
9. The Tester displays several messages and instructions relating to the individual work steps until the message Control unit replacement was completed successfully  appears. Press [>>].
10. To check the system, select the Actual values  menu under the AWS  control unit. Then press [>>].
    1. 10.1. Select the Weight group (0-4)  and Gross weight calibrated  options.
       1. 10.1.1. If there is no weight  on the passenger's seat, compare values (see table below) using the PIWIS Tester. The Passenger Airbag Off indicator light in the center console must  not come on.
       2. 10.1.2. Place the special tool test weight 9742  on the passenger's seat. The Passenger Airbag Off indicator light in the center console must come on. Compare values (see table below) using the PIWIS Tester.
       3. 10.1.3. Get an assistant with a body weight of more than 55 kg, for example, to sit on the passenger's seat. The Passenger Airbag Off indicator light in the center console must not  come on. Compare values (see table below) using the PIWIS Tester.

          Test state	Weight class (0-4)	Total weight calibrated (seat in calibration position)
          No weight on the passenger's seat.	0	→ Control value: 0 kg+/-1 kg
          Special tool test weight 9742  on passenger's seat	1	→ Control value: 6.7 kg+/-1 kg
          Get a person weighing > 55 kg at least to sit on the passenger's seat.	2, 3 or 4	→ Control value for person's weight: > 55 kg; person's weight +/- 25 %

11. Read out and erase the fault memories in the Airbag  and AWS  control unit, perform a test drive and then read out the fault memories again. If faults are found, determine the cause using the PIWIS Tester and correct the faults.