Description of the individual services within the scope of BOSCH VEHICLE HEALTH CERTIFICATE
1. Crash history
a. Service description: Bosch uses a Bosch tool to read data from the so-called Event Data Recorder (EDR). The EDR continuously records certain data during a journey. Only the data on special crash events (so-called events) that have been predefined as record-worthy by the vehicle manufacturer are stored. Bosch has no influence on the underlying definition; it can vary from manufacturer to manufacturer. Accordingly, the service can only carry out evaluations of data that are stored in the respective control unit (usually airbag control unit) and are readable at the time of reading.
As part of the crash history, Bosch only represents the 6 events with the highest impact force.
b. Limitations:
Particularly for the following reasons it may be that no crash history can be created from crash data:
i. The specification of the vehicle may be such that accident data is only recorded when the car is driving. In which case, there will be no recording of incidents when the vehicle is stationary.
ii. The Event Data Recorder only records at an impact speed defined by the vehicle manufacturer. Bosch has no influence on this determination.
iii. After an exchange of the airbag control unit the accident data stored in it is lost and no longer available for evaluation. A replacement of the control unit may be required, for example, if the airbag has been triggered in the past. In such cases, automotive manufacturers usually recommend replacing the airbag control unit.
iv. Number of events stored is limited by limited storage space. For example, this can cause a recording to be omitted or less critical events to be overwritten with more critical events. The storage capacity can vary from manufacturer to manufacturer, Bosch has no influence on this.
v. If no EDR is installed in the vehicle, a BCC cannot be created due to lack of data. The same applies if the data present in the EDR is damaged or incomplete.
2. Battery state of health:
a. Service description: Bosch reads data about the state of health (SoH) of the high-voltage battery from the vehicle’s battery management system. Batteries are subject to an aging process over their lifetime, which reduces their capacity and performance. The SoH describes the aging state of the battery compared to the nominal capacity and the SoH is given in percent. For example, if a battery with 90% SoH had an initial rated capacity of 100 kWh, it was reduced by the aging process and is now 90 kWh.
Bosch has no influence on the calculation of the SoH value, which takes place in the battery management system following principles that are determined by the vehicle manufacturer. This means that the service is limited to a pure reading of the value via the available signals of the OBD interface. Bosch neither calculates nor interprets the value.
3. Mileage:
a. Service description: Bosch compares the KM status displayed in the vehicle display and entered by the customer with the KM statuses read out from various vehicle control units. If Bosch finds a KM level in the vehicle´s control units that is significantly higher than the level shown in the display, Bosch points out this discrepancy. For example, such discrepancy can be an indication of a manipulation of the KM status according to the vehicle display. As a rule, however, it is not possible for Bosch to make a statement about the reason for a discrepancy detected, such as whether a manipulative intervention has taken place.
In principle, the service may not be created or may be defective for the following reasons:
i. Not all values from the vehicle control units are comparable with the KM status in the vehicle display (for example, in vehicle control units with information about service intervals)
ii. If a workshop enters the customer’s KM status manually, errors can occur. In this case, a discrepancy would be shown, but would not actually exist. Bosch has no influence on this source of error and cannot guarantee that it is free of errors.
iii. If a control unit has been replaced in the vehicle, which usually stores the mileage and is queried as part of the service (for example, exchanged instrument cluster or engine control unit), this may result in discrepancies with the mileage status of the vehicle display, the cause of which can only be seen in the replacement of the control unit.
4. Service Status:
a. Service description: Bosch reads out whether the service interval has been exceeded from the relevant vehicle control units and indicates how many days and/or how many kilometres the next service is due. Bosch therefore has no information about all previous services, so a service history cannot be created.
i. If the service entries have been deleted (for example by a workshop), Bosch can no longer view/read them.
5. Trouble codes (DTCs):
a. Service description: Bosch reads out all the fault codes from various vehicle control units and displays the information (code number, vehicle control unit and fault code description) in 2 sections:
i. Error codes that might require further investigation
ii. Other error codes (no further investigation required)
In principle, the customer must consider the following limits:
i. Bosch’s performance is limited to the mere reproduction of the error codes. Despite of the categorization it is the sole responsibility of the workshop to carry out the technical assessment/assessment of the fault codes and to derive concrete own workshop services from them.