Symptom:Due to the failure to start the vehicle, multiple system alarms in the instrument were dragged back to the maintenance shop for maintenance.
Troubleshooting:After receiving the vehicle, first verify the fault phenomenon reflected by the user, press the start button, and the starter does not run.The dynamic stability control system DSC and electromechanical power steering system EPS fault lamps in the instrument and central information display light up and alarm.Connect the ISID for diagnostic detection and read the fault contents as follows:
◆ 930730 - Starter output terminal: current overload
◆ ◆ 482399 - EPS power supply: the control module voltage is too high, turn off the power steering
◆ ◆ D02C2-4 EPS interface (actual force of rack, 49.0.2): the signal is invalid
◆ ◆ 48071C DSC unit: internal,pump, supply voltage
◆ ◆ D019C3 - EPS interface (actual steering torque of driver side actuator, 49.0.2): the signal is invalid.
Select the fault content to execute the detection plan. The fault data stores the following fault data for the detected function or component: 48071C (DSC unit: internal,pump, supply voltage).It is recommended to check the power supply lead of the motor relay according to the circuit diagram, as shown in Figure 1.The inspection plan also indicated the known fault causes on F25, which were caused by water ingress at the tail and battery tank area.
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Figure 1 Power supply line
Detect that pin 1 of dynamic stability control system DSC connection terminal A156 * 1B has no voltage.It can be seen from the circuit diagram that this wire is directly powered by the positive pole of the battery, that is, the permanent positive pole.Next, open the boot to check the battery slot according to the prompt "known fault cause on F25: corrosion due to water ingress in the tail and battery slot area" in the test plan.It was found that the battery slot in the boot was indeed flooded.A thick wire connector from the battery positive pole to the bottom of the vehicle has been severely rusted and loosened, as shown in Figure 2.This wire givesengineRoom distributor power supply (bus end KL. 30).Battery lead toengineThe room distributor is connected to the starter and generator through the positive battery terminal.The engine room distributors are the following consumers:
◆ ◆ Electro mechanical power steering system (EPS, English: "Electronic PowerSteering")
◆ ◆ Reflux pump (component of DSC unit, DSC refers to dynamic stability control system)
According to the circuit diagram, the connector of the thicker wire on the bottom plate in the trunk is exactly the transfer terminal X01 in Figure 1.Corrosion looseness occurred at this position, not only the electrical appliances supplied by the distributor in the engine room could not work normally, but also the starter could not work.
Finally, according to the maintenance instructions, deal with the location of water leakage in the boot, replace a section of harness from the battery positive pole to the bottom plate, delete the fault storage, the vehicle can start normally without fault alarm, and the fault is eliminated.
Brand Specialty: (Keyword:The BMW X3 trunk is flooded and the vehicle cannot be started for maintenance. The number of times the car electrical appliances are downloaded for maintenance, the trunk, the control system, the downloaded accessories, and the current distributor)
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