Power Distribution Module: Service and Repair

971019 Removing And Installing Vehicle Electrical System Control Unit

Preliminary work

Preliminary work - vehicle electrical system control unit
Detach relay carrier

Removing vehicle electrical system control unit

Install location:

WARNING:
Risk of damage to electronic control modules.
- If care is not taken, electrical and electronic components may be destroyed.
- Before removing the control module, switch off the ignition and remove the ignition key.

Bracket for the vehicle electrical system control unit:

1. Pull apart the locking tabs -A- for the vehicle electrical system control unit, pull the control unit forward and down with connectors still attached then pull it out of its holder at the rear.

Release connector A and disconnect:

2. Release both electrical connectors -A- and unplug them.
3. Take out the control unit.

Installing vehicle electrical system control unit

Inserting the connectors:

1. Press electrical plugs into control unit and lock them -arrow- so they are felt to engage.

Push the electrical system wiring into its retaining bracket so that it engages:

2. Push vehicle electrical system control unit upwards into the holder. It must engage properly. Make sure the electrical leads are not pinched.

Subsequent work for vehicle electrical system control unit
Attach relay carrier.

Coding vehicle electrical system control unit

Programming the vehicle electrical system control unit:

Reading out and printing out values

WARNING:
Sudden voltage interruption of the power supply to the control module.
- Destruction of the control module.
- During programming, it is essential to guarantee the power supply for the Porsche System tester. It is essential to connect a battery charger with a current rating of at least 40 A to the vehicle battery.
- Prior to disconnecting the control module, switch off the ignition and remove the ignition key.

NOTE:
- Follow the instructions on the Tester.
- Later versions of the software may display slightly different text or require a slightly different procedure. The instructions you receive from the tester itself take precedence over this description.

1. Connect the Porsche System Tester to the vehicle and start the System Tester. Switch on the ignition. ">>" Continue.
2. Select vehicle type using the cursor keys.
3. Switch from vehicle type to list of control units ">>".
4. Select the relevant control unit with the cursor keys and press the ">>" key.
5. Select Control Unit Replacement with the cursor keys and press the ">>" key.
6. Select Read Out Values (Code) with the cursor keys and press the ">>" key.
7. The message "Reading code" will appear on the screen of the Porsche System Tester. Press the ">>" key.
8. Switch off ignition and replace control unit.
9. Switch on ignition. After replacement of the control unit, the vehicle data that has been read out is transferred to the new unit using the "Write data" menu option (see Section 6). Press the ">>" key.
10. System Tester displays Coding write-in complete. Press the ">>" key.
11. Read out fault memory again and erase.

Coding (programming) the control module

WARNING:
Sudden voltage interruption of the power supply to the control module.
- Destruction of the control module.
- During programming, it is essential to guarantee the power supply for the Porsche System tester. It is essential to connect a battery charger with a current rating of at least 40 A to the vehicle battery.
- Prior to disconnecting the control module, switch off the ignition and remove the ignition key.

NOTE:
- Follow the instructions on the Tester.
- Later versions of the software may display slightly different text or require a slightly different procedure. The instructions you receive from the tester itself take precedence over this description.

1. Connect the Porsche System Tester to the vehicle and start the System Tester. Switch on the ignition. ">>" Continue.
2. Select vehicle type using the cursor keys.
3. Using the ">>" key, move from the vehicle type to the list of control modules. Perform the automatic control module search.
4. Select the relevant control module with the cursor keys and press the ">>" key.
5. Select Coding with the cursor keys and press the ">>" key.
6. Select the version required for the vehicle in question and follow the instructions on the Tester.
7. In the menu Vehicle type, select Control units and then select the menu Special functions.
8. Perform Vehicle handover and follow the instructions of the tester.
9. Read out and erase fault memory.