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BYD DM-i plug-in hybrids combine electric driving with gasoline-powered flexibility. For workshops, servicing these vehicles requires an understanding of both power sources—and a practical way to access the systems behind them.
Battery diagnostics begins before the first fault code or live-data reading appears. Technicians must identify the battery pack, select the correct diagnostic application, and establish the appropriate connection.
XTOOL E2Pro provides more than 1,600 high-definition battery pack wiring diagrams to support this preparation. By showing connector layouts, pin definitions, and cable connections visually, these diagrams help trained technicians turn unfamiliar connection requirements into a clearer setup process.
A BYD Qin L DM-i example illustrates that value. The E2Pro screens show a VE8 battery pack selection and a wiring diagram for the matching 268.8V/37.5Ah specification.
Key Takeaways
BYD DM-i is a plug-in hybrid system, so workshop preparation must account for both combustion and electric systems.
Battery pack identification matters: the Qin L DM-i diagnostic menu contains multiple pack options.
E2Pro’s high-definition wiring diagrams help technicians interpret connection requirements at the point of work.
The Qin L example demonstrates pack selection and connection guidance; diagnostic findings require subsequent communication and testing.
BYD DM-i is an electricity-focused plug-in hybrid system. It combines a traction battery and electric motor with a gasoline engine, allowing electric driving and hybrid operation according to driving conditions and available battery charge.
Depending on the operating mode, the engine can generate electricity or participate in driving the wheels. BYD’s SEALION 6 technical overview describes its DM-i architecture and its electric and hybrid drive modes.
For workshops, this means that a battery-related concern needs to be understood within a wider vehicle system. Battery management, charging, thermal management, power electronics, and engine operation can all be relevant to the diagnostic process.
DM-i is available outside China under different vehicle names. Australia offers the SEALION 6 with DM-i technology, while BYD’s Brazilian lineup includes the KING DM-i and SONG PLUS DM-i. These are established local product offerings, rather than concepts awaiting overseas introduction. See BYD Australia and BYD Brazil’s model directory.
For service businesses, the practical question is which locally available vehicles and battery configurations their equipment supports.
An overseas model name alone does not establish battery compatibility. Market, model year, battery specification, software version, and required diagnostic function all need to match the intended application.
The Qin L DM-i example below provides a concrete look at diagnostic preparation. It does not establish identical battery hardware across overseas DM-i models.
The supplied E2Pro screen shows the following software path, translated from the Chinese interface:
BYD V7.63 → Qin → Qin L → Qin L DM-i → Battery Pack Data (BPD)
Within that menu, the software separates OBD testing from off-vehicle testing.
The VE8 entry appears under off-vehicle testing and identifies the pack as:
| Field | Displayed information |
|---|---|
| Battery pack identifier | VE8 |
| Voltage specification | 268.8V |
| Capacity specification | 37.5Ah |
| Manufacturer | FinDreams |
| Chemistry | LFP |
Other battery pack entries appear in the same menu. This makes identification an essential part of preparation: selecting the vehicle family is followed by matching the actual battery pack.
Image placement: Battery pack selection screenshot.
Caption: E2Pro’s Qin L DM-i battery menu lists the VE8 268.8V/37.5Ah FinDreams LFP pack under off-vehicle testing.
The second screen displays a wiring diagram labeled for a Qin L battery pack with the matching 268.8V/37.5Ah specification.
It brings several useful references together:
A diagnostic interface and cable illustration.
A connector layout with numbered positions.
A connector photograph for physical reference.
A table connecting pin definitions to the corresponding leads.
Identification of 12V supply, ground, CAN-H, and CAN-L connections.
This presentation helps technicians relate an electrical function to a connector position and then to the required diagnostic lead.
Instead of repeatedly switching between a connector photograph, a pin-definition table, and separate cable information, technicians can consult them together on the diagnostic device. That can reduce the time spent interpreting the setup and make connection preparation easier to follow.
The diagram’s 12V supply information relates to the diagnostic setup. It is distinct from the battery pack’s 268.8V specification.
Image placement: Wiring diagram screenshot.
Caption: E2Pro displays a connector image, pin-definition table, and connection diagram for the matching Qin L battery specification.
A wiring diagram library has practical value when it helps a technician answer the questions immediately in front of them:
Which connector is required? Which terminal performs each function? Which lead belongs at that position?
E2Pro’s library of more than 1,600 high-definition battery pack wiring diagrams supports that work across covered applications.
For a technician encountering an unfamiliar pack, visual guidance provides a clearer starting point. For a workshop manager, it offers a useful reference for training and consistent preparation. For an equipment distributor, it demonstrates why diagnostic coverage should be evaluated alongside the connection information supplied with the tool.
A diagram does not remove the need to identify the pack correctly. Its value comes from making the correct connection information easier to understand and use.
Battery work should be performed by trained personnel following the applicable service information and isolation procedures.
Establishing communication is the next stage after identifying the pack and checking the connection requirements.
Across supported applications, E2Pro provides battery diagnostic functions such as reading fault codes, live data, cell voltages, temperature information, and available SOC/SOH data. Function availability depends on the specific application and software coverage. XTOOL’s passenger EV diagnostic solution overview describes these broader capabilities.
The Qin L screenshots document the selection and connection-guidance stages. They do not show a completed live-data session, a battery health assessment, or a repair result.
That distinction matters when evaluating equipment. Workshops should confirm both the connection method and the exact data or functions required for their intended work.
Before selecting a diagnostic solution for a particular BYD application, establish:
Vehicle identity: market, model, and model year.
Battery identity: pack identifier, voltage, capacity, and connector.
Test method: vehicle-level OBD access or supported off-vehicle testing.
Connection requirements: compatible interface, cables, and wiring guidance.
Required functions: the specific information needed for the diagnostic task.
The Qin L VE8 example shows how these decisions begin to come together inside E2Pro: a defined vehicle path, a specific battery pack entry, and visual connection information for the matching specification.
Contact XTOOL with your vehicle details, battery pack identification, and required functions to confirm the appropriate E2Pro configuration and current coverage.
