Mercedes-Benz Maybach S480 battery leak:
1. Fault Analysis: Customers of this car reported that the car ran out of power after being left for a few days. Because of this, the battery was discharged. replaced, but the defect remained. After arriving at the station, I first checked the computer and found that there was an error code in the grid management system indicating that the generator could not communicate. Static current detection does not reach the specified value, 0.8-0.9A. Because of this fault code, I planned to eliminate it first and replace the generator, but the fault persisted. Then I replaced J367, but the fault code still hasn't been cleared. The LIN wire between them was normal and there was no open circuit. or a short circuit to ground.
2. Since this error code cannot be eliminated at this time, we plan to first determine thelocation of the leak by removing the fuse. When the static current returns to normal after J533 is removed, it is determined that there is a problem with J533 itself or the components connected to it. Replace J533 first, but the fault is not eliminated. Considering that there is an error code indicating that the generator cannot communicate, the fault was cleared when the LIN line from J533 to the generator was cut. At that time, it was determined that the point of fault was the connection between J533 and the generator. . Looking at the circuit diagram, there are two pins in the middle of the connection between J533 and the generator. After unplugging these two plugs, no water stains or corrosion were found.
3. At that time, maintenance was at a dead end. After communicating with the customer, I learned that this car had been involved in an accident outside and the generator had been hoisted. JavaIt is planned to thoroughly check the entire wiring harness from J533 to the generator. When I checked the T17a plug, I found that there were oil stains on the back of the plug and several pins were corroded. was hoisted. After treatment, the pins were replaced and the defect was completely eliminated.