Replacing Trailer Hitch Control Unit
CAUTION:
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.
NOTE:
The PIWIS Tester 3 9900
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 3 9900.
- PIWIS Tester II 9818 must be connected to the vehicle before starting PIWIS Tester II 9818. Switch on ignition.
- Start the diagnostic application and select the required vehicle type.
- Select the Trailer hitch (AHK) control unit in the overview.
- Codings/adaptations must now be selected. Then press F12 to continue.
- Wait for confirmation that coding was completed successfully. Then press F12 to continue.
- Drive links/checks must now be selected.
- Select Initialisation of trailer hitch control unit.
- Select the status All adoption values and press F8 to start the standardisation process.
- Erase the fault memory and switch off ignition.
- PIWIS Tester II 9818 must now be disconnected from the vehicle.
- Disconnect the battery charger from the vehicle.