578955 Replacing Control Unit for Rear-end Electronics

WM 578955 Replacing control unit for rear-end electronics

Tools





Technical values





Reading and writing values

Information

All remote controls (keys) are required for teaching a DME, front-end electronics (front BCM), rear-end electronics (rear BCM), electronic steering lock (ELV) control unit or remote controls (keys).

Remote controls (keys) that are not taught during this teaching procedure will no longer be recognised by the vehicle.

NOTICE

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 the ignition and remove the 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.

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 additional information may appear in PIWIS Tester II 9818.

1. Connect the Porsche System Tester to the vehicle and start the System Tester. Switch on ignition.
2. Select vehicle type.
3. Select the Rear-end electronics control unit in the overview.
4. Select Rear-end electronics control unit.
5. Select Maintenance/repairs.
6. Select Control unit replacement and press F12.
7. Select Read data and press F12.
8. Press F8 to start reading out data.
9. Check the chassis number and press F12.
10. Switch off ignition and replace control unit. -> 578919 Removing and installing control unit for rear-end electronics 578919 Removing and Installing Control Unit for Rear-end Electronics
11. Go back to the Start page on the Tester.
12. To activate the control units, switch on the hazard warning lights.
13. Select the Online teaching function menu on the Start page.
14. Select Vehicle and press >>. Vehicle data will be read out.
15. The vehicle identification number (VIN) is displayed. Adapt the vehicle identification number if necessary.
16. Enter the repair order number and press >>.
17. Enter the PPN user name and password and press >>.
18. Login is performed.
19. The Tester displays the message Login successful. Press >>.
20. Follow the instructions on the Tester to select the required menu.
21. Once the teaching process is completed successfully, the Tester shows the following status, for example:
2 keys taught
Front BCM: taught
ELV: taught
Rear BCM: taught
DME: taught
Overall vehicle status: taught
22. >>.
23. Press EXIT to exit the Online teaching function and select the vehicle type on the Start page.
24. Press F7 Read all fault memories and erase if required and delete all faults.
25. SelectRear-end electronics using the cursor keys and press >>.
26. Select Control unit replacement with the cursor keys and press the >> key.

Re-install the data that was read out by selecting Write values.
27. Press F7 Read all fault memories and erase if required and delete all faults.
28. Function test: Lock, open and start the vehicle using all remote controls.
29. Read out fault memory.