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Opel Astra: The offended control unit
This time our diagnostic thriller comes from the Wanitschek car dealership in Leiben, Lower Austria. The mysterious error occurred in a six-year-old OPEL ASTRA J.
Opel Astra: The offended control unit
Car dealership owner Jörg Wantischek reports on a case from which two conclusions can be drawn: A small defect does not have to be fixed by replacing entire components, and following one or more false leads can cost the workshop customer dearly. One day a customer comes to the Wanitschek workshop who has already been through an expensive odyssey: He recently purchased a six-year-old Opel Astra J Sports Tourer, 1.7 CDTI Ecotec with an 81 kW diesel engine that had been standing for a long time. The car is in good condition, drives without problems and only has one small flaw: the windscreen wiper only works sporadically. So the customer goes to an independent workshop to have the supposed triviality fixed, but when he picks up the car again, he is presented with a hefty bill. According to the mechanic, the windshield wiper motor had to be replaced, which is only available as a spare part complete with a windshield wiper linkage and costs just under 600 euros. In addition, the body control unit was allegedly defective and was also replaced - cost: just over 400 euros. To his even greater annoyance, the customer discovers that the windshield wiper still doesn't work properly. He decides to go to a specialist workshop and takes his Astra to Opel Wanitschek. A diagnostic mystery begins there:
▶ First, the error codes are read using an Opel diagnostic tester. Result: Two data bus errors U1515 and U1516 are saved, meaning: “No communication with device via LIN bus”.
▶ The experienced automotive technician now knows that the communication between the control unit, body, front wiper motor module and battery sensor module is not working.
▶ Troubleshooting now begins using the circuit diagram; at the same time, the control devices involved on the LIN bus are identified.
▶ Further diagnostics show that only the battery sensor module has not been trained.
▶ Remedy: The battery sensor module is reset using a diagnostic tester and the error codes are deleted.
▶ Result: The windshield wiper works properly again, the case is solved.
PETER SEIPEL LADEN WANTS TO BE LEARNED
For older vehicles, charging was onebatterya simple matter: disconnect the plus and minus poles, connect the charger and wait until the green light lights up. Inmodern vehiclesHowever, which requires significantly more functions and performance from the power storage, the battery is replaced by asensormonitored, which continuously informs the control unit responsible for the start-stop process about the charging status. This control unit is ignored when charging the battery in the vehicle because the chargerdirectto theBattery terminalsis connected, it reacts offended and shows it, for example, with aMalfunctionof the windshield wiper. Conclusion: ThisGround cableof the charger should be on theVehicle massand not connected to the negative terminal of the battery - so the current flows through it during chargingBattery sensor moduleand informs the control unit about the charging.