How to Replace the Comfort Module in a Passat B5?
2 Answers
You need to enter the security login code 40168 before calibrating each sensor, and the security code must be entered for matching each sensor. Before matching the G85 steering angle sensor, the steering angle data stream must be read within the range of ±5 degrees to proceed with the G85 matching; otherwise, the matching will fail. After the G85 data stream is within the range of ±5 degrees, exit the diagnostic tool, re-enter the system basic adjustment after successfully inputting the security login code 40168. After inputting, the dashboard will emit a beep prompt, then turn the steering wheel fully to the left and wait for three seconds, then turn it fully to the right and wait for three seconds, finally return the steering wheel to the center position, and the fault light will turn off.
Last year, I replaced the comfort module on my Passat B5 by myself. First, I prepared a new module and a T20 screwdriver. Disconnecting the negative terminal of the battery is a must, otherwise, it's easy to blow a fuse. After removing the trim panel above the footwell on the passenger side, you can see this small black box, which has four securing screws. When unplugging the connectors, be especially careful to mark the wiring harness order—I didn’t make any marks initially and ended up reinstalling it three times. After installing the new module, don’t rush to put the trim panel back on; first, reconnect the battery to test the window lift and central locking functions. The most troublesome part was the matching process—I used an OBD scanner to perform basic settings, but the remote key still needed to be reprogrammed. The whole process took over two hours, and my biggest takeaway was how fragile the interior clips are—I broke three before realizing I needed to use a specialized tool.
