Golf 4 Rear Window Problems & Fixes

Hello,

Friends recently bought a used G4 "Generation" from the early 2000s (engine: 1.4L APE) with 113,000 km on the odometer. It's their first car with features like central locking and electric windows, which has opened the door for them to experience the world of quirky comfort electronics.
Excerpt from the error scan:

Code:

Adresse 46: Komfortsystem        Labeldatei: DRV\1J0-959-799.lbl    Teilenummer: 1J0 959 799 AH    Bauteil: 4E Zentral-SG Komf. 0001     Codierung: 04097    Betriebsnr.: WSC 31414     VCID: 040C5AA414E7E26286-4B00    Subsystem 1 - Teilenummer: 1J1959801C    Bauteil: 4E Tõrsteuerger. FS0002r     Subsystem 2 - Teilenummer: 1J1959802D    Bauteil: 4E Tõrsteuerger. BF0002r     Subsystem 3 - Teilenummer: 1J4959811C    Bauteil: 4E Tõrsteuerger. HL0002r     Subsystem 4 - Teilenummer: 1J4959812C    Bauteil: 4E Tõrsteuerger. HR0002r  2 Fehlercodes gefunden: 00914 - Schalter für Fensterheber hinten links; Fahrer (E53)             27-10 - unplausibles Signal - Sporadisch 00915 - Schalter für Fensterheber hinten rechts; Fahrer (E55)             27-10 - unplausibles Signal - Sporadisch

Correspondingly, the rear door handles only respond to switch commands from the driver's door at random. The direct operation from the back seat functions normally.
According to the SLP (System Logical Plan), the signals from the two rear door switches are transmitted via an analog cable to the driver door control unit (StG), and from there, via CAN bus, to the other door control units and the central comfort control unit.
All four driver's side door control module (DOOR CM) switches connect the respective "sensor wire" to a common ground line through variable resistors. The DOOR CM likely detects which command is being given based on the current flowing to ground through these resistors.
Based on all of this, I suspect that the current flow from both rear door switch sensors is no longer reliably within the specified range for command recognition by the door control unit; possibly due to infrequent use and subsequent corrosion of the switch contacts.

Are there any other common causes known for the aforementioned error? I would currently tend to rule out waterlogged A-pillar connectors, because the driver commands to all three other power windows are transmitted via CAN bus, only the two rear power windows are affected, and no CAN errors have been logged.

Hi Ulf,

possible, or just plain garbage...

I would try to fix it.

We actually have something there .

Okay, I'm ready. Please provide the German text you want me to translate into English.

Thank you @ Gremlin .
I'll send the PDF to my friends right away.