For add heating function, heated steering wheel and the steering wheel electronics control unit(Clock spring) must also be ordered and activated(VIN-specific enabling code) by PIWIS.For this upgrade will need your VIN number to pursche all active code.
99% of Porsche 991/981/970/958.1 original with standard steering wheel(None multifunction and non shift peddles) upgrade to multifunction steering wheel ,need replace to new Clock Spring can activate multifunction success.
Replace steering wheel electronics control unit(Clock spring) work procedure:
1 Disconnect battery;
2 Remove drivers's airbag unit;
3 Remove original steering wheel;
4 Replace electronics control unit(Clock spring) and steering-column switch(Only for vehicles without multi-function steering wheel),original steering-column switch of multifunction control can keep connected also;
4.1 Remove steering column casing;
4.2 Remove steering-column switch;
4.3 Install new steering wheel electronics control unit(Clock spring) on the new steering-column switch(Only for vehicles without multi-function steering wheel);
4.4 Install steering-column switch;
4.5 Slide cover(991.552.675.00.1E0)into the steering column casing;
4.6 Install steering column casing;
5 Code control units and calibrate steering angel sensor following step.
5.1 PIWIS Tester must be connected before switching on the ignition.Write basic coding from PCM.
5.1.1 Select Steering wheel electronics control unit. Press •F11“ to confirm the question “Create vehicle analysis log (VAL)?”.
Switch to the Maintenance/repairs menu.
5.1.2 Select Control unit replacement. Press •F12“ to continue.
5.1.3 Select Write data mode. Press •F12“ to continue.Press •F8“ to write basic information.
Wait until the message Coding has been written successfully appears. Press •F12“ to continue.
5.1.4 Press •F11“ to go back. Switch to the Overview menu.
Check the chassis number in the steering wheel electronics control unit.
5.1.5 Select Steering wheel electronics control unit.
Switch to the Extended identification menu. Check the chassis number and change it if necessary.
7 Enable functions.
7.1 Switch to the Maintenance/repairs menu. Select the Function enable function.
7.2 Enable the Heated steering wheel and multi-function steering wheel function. Enter the activation codes and confirm by touching the Status cell.
7.3 Enable the Cruise control function if necessary.Enter the activation code and confirm by touching the Status cell.
7.4 Press •F8“ to execute. Wait until the message Enable was successful appears. Press •F12“ to continue.
8 Calibrate steering-angle sensor.
The steering angle sensor is integrated into the steering electronic controller(Clock Spring) and is responsible for recording the movement of the steering wheel (steering wheel angle). Data is transferred to the PSM control unit via the CAN bus.
8.1 Select from the control unit overview in PIWIS: Steering wheel electronics-->Maintenance/repairs-->Steering-angle sensor calibration
8.2 Follow the PIWIS system prompts,calibration successful PSM indicator in instrument is off.
9 Read out the fault memories of all systems, work through any existing faults and erase the fault memories.
Mar 28, 2019 • Posted by John Sweeney
My apologizes for taking so long to get back to you. You say there may be 3rd party people that may have the codes to get the new clock spring to work. That would be fantastic. Replacing the switch with a new one is no problem. I am not sure if instructions that you give above would be the same for a 958.2 they seem simple enough