
Verified Fitment
| Brand | Model | Year | Variant / type code |
|---|---|---|---|
| BYD | D1 | 2020 | Elite Y (Optional 3-in-1) |
| BYD | D1 | 2021 | Elite Y (Optional 3-in-1) |
| BYD | D1 | 2022 | Elite Y (Optional 3-in-1) |
| BYD | D1 | 2023 | Elite Y (Optional 3-in-1) |
| BYD | D1 | 2024 | Elite Y (Optional 3-in-1) |
| BYD | Han DM-i | 2024 | Type 05 |
| BYD | Han DM-i | 2024 | Type 35 |
| BYD | Han DM-i | 2025 | Type 35 |
| BYD | Han DM-i | 2026 | All versions |
| BYD | Han EV | 2021 | All versions |
| BYD | Han EV | 2024 | Type 10 |
| BYD | Han EV | 2024 | Type 15 |
| BYD | Han EV | 2025 | Type 10 |
| BYD | Han EV | 2025 | Type 15 |
| BYD | Han EV | 2026 | All versions |
| BYD | Han EV Glory | 2024 | Type 10 |
| BYD | Han EV Glory | 2025 | Type 10 |
| BYD | Qin PLUS DM-i | 2025 | All versions |
| BYD | Qin PLUS DM-i | 2026 | All versions |
| BYD | Seal | 2023 | Type EK-50 2024 |
| BYD | Seal | 2024 | -5R10V |
| BYD | Seal | 2024 | -5R5V |
| BYD | Seal | 2024 | Type EK-50 2024 |
| BYD | Seal | 2024 | Type EK-55 -Panoramic Glass-Roof (5R12V1L) |
| BYD | Seal | 2024 | Type EKEAA-20 5R5V |
| BYD | Seal | 2024 | Type EKECA-40 Dimming Glass-Roof (-5R5V) |
| BYD | Seal | 2025 | -5R5V |
| BYD | Seal | 2025 | Type EK-55 -Panoramic Glass-Roof (5R12V1L) |
| BYD | Seal | 2025 | Type EKEAA-20 5R5V |
| BYD | Seal | 2025 | Type EKECA-40 Dimming Glass-Roof (-5R5V) |
| BYD | Sealion 05 DM-i | 2025 | All versions |
| BYD | Sealion 05 DM-i | 2026 | All versions |
| BYD | Sealion 06 EV | 2026 | All versions |
| BYD | Song L DM-i | 2025 | All versions |
| BYD | Song L DM-i | 2026 | All versions |
| BYD | Song PLUS DM-i | 2024 | Type 10 (Beige-Brown Two-Tone Interior) |
| BYD | Song PLUS DM-i | 2024 | Type 20 (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS DM-i | 2024 | Type 30 (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS DM-i | 2025 | Type 20 (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS DM-i | 2025 | Type 30 (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS EV Champion | 2024 | Flagship Y (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS EV Champion | 2024 | Luxury Y (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS EV Champion | 2025 | Flagship Y (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS EV Champion | 2025 | Luxury Y (Blue-Grey Two-Tone Interior) |
| BYD | Song PLUS EV Smart Driving | 2025 | All versions |
| BYD | Tang DM-i | 2024 | Type STHZ 30 |
| BYD | Tang DM-i | 2025 | Type STHZ 30 |
| BYD | Tang EV | 2022 | Distinguished Y |
| BYD | Tang EV Champion | 2021 | Type STERA-10 (Optional CDC) |
| BYD | Tang EV Champion | 2021 | Type STESA-10 |
| BYD | Tang EV Champion | 2021 | Type STETA-15 |
| BYD | Tang EV Champion | 2022 | Type STERA-10 (Optional CDC) |
| BYD | Tang EV Champion | 2022 | Type STESA-10 |
| BYD | Tang EV Champion | 2022 | Type STETA-15 |
| BYD | Tang EV Champion | 2023 | Type STERA-10 (Optional CDC) |
| BYD | Tang EV Champion | 2023 | Type STESA-10 |
| BYD | Tang EV Champion | 2023 | Type STETA-15 |
| BYD | e1 | 2019 | High-Spec (Without Battery-Heating) |
| BYD | e1 | 2019 | Low-Spec Comfort (With Battery-Heating) |
| BYD | e1 | 2020 | High-Spec (Without Battery-Heating) |
| BYD | e1 | 2020 | Low-Spec Comfort (With Battery-Heating) |
| BYD | e1 | 2021 | High-Spec (Without Battery-Heating) |
| BYD | e1 | 2021 | Low-Spec Comfort (With Battery-Heating) |
| BYD | e2 | 2019 | Comfort (10-inch, Screen) |
| BYD | e2 | 2019 | Elite (Ride-Hailing, Ventilated & Heated Seats) |
| BYD | e2 | 2019 | Luxury (10-inch, Screen) |
| BYD | e2 | 2020 | Comfort (10-inch, Screen) |
| BYD | e2 | 2020 | Comfort Y Optional Black-White, Two-Tone Kit, 10-inch, Screen |
| BYD | e2 | 2020 | Elite (Ride-Hailing, Ventilated & Heated Seats) |
| BYD | e2 | 2020 | Elite (Taxi, Mechanical Sensor) |
| BYD | e2 | 2020 | Elite Y Ride-Hailing 2020 |
| BYD | e2 | 2020 | Luxury (10-inch, Screen) |
| BYD | e2 | 2020 | Luxury Y Optional Black-White, Two-Tone Kit 2020 |
| BYD | e2 | 2020 | Luxury Y2020 |
| BYD | e2 | 2020 | Standard Y (Corporate Edition) |
| BYD | e2 | 2021 | Comfort Y Optional Black-White, Two-Tone Kit, 10-inch, Screen |
| BYD | e2 | 2021 | Elite (Taxi, Mechanical Sensor) |
| BYD | e2 | 2021 | Elite Y Ride-Hailing 2020 |
| BYD | e2 | 2021 | Luxury Y Optional Black-White, Two-Tone Kit 2020 |
| BYD | e2 | 2021 | Luxury Y2020 |
| BYD | e2 | 2021 | Standard Y2020 |
| BYD | e2 | 2022 | Elite Y Ride-Hailing 2020 |
| BYD | e2 | 2022 | Luxury Y |
| BYD | e2 | 2022 | Luxury Y2020 |
| BYD | e2 | 2022 | Standard Y2020 |
| BYD | e2 | 2023 | Luxury Y |
| BYD | e2 | 2024 | Luxury Y |
| BYD | e2 | 2025 | Luxury Y |
| BYD | e3 | 2019 | Comfort |
| BYD | e3 | 2019 | Elite (Ride-Hailing, Ventilated & Heated Seats) |
| BYD | e3 | 2019 | Luxury (10-inch, Screen) |
| BYD | e3 | 2020 | Elite (Taxi) |
92 vehicle versions. Scroll inside the box to see them all. Type codes are printed on the vehicle identification plate. Not sure? Send us the number from the old part over WhatsApp and we confirm it against the factory catalogue before you order.
Power Relay 12V 40A for BYD Sealion 06 & Song L, OE 12788402-00
Price shown without any local sales tax. Shipping is shown on this page and confirmed at checkout. Import taxes and duty in Hong Kong SAR are not included and may be charged when the parcel arrives.
About This Part
12V 40A power relay, type HFV15/12-Z1, carrying OE 12788402-00. This compact four-pin plug-in relay switches high-current circuits from the fuse box and drops into a standard relay socket. It fits the 2026 Sealion 06 EV, 2026 Song L DM-i, 2026 Sealion 05 DM-i and many further BYD models. Also called a mini relay or automotive changeover relay.
Technical Details
| Specification | Value |
|---|---|
| Condition | New |
| Quality line | Original/Genuine |
| Material | Plastic |
| Colour | Black |
| Mounting position | Engine Bay |
| Amount in delivery | 1 piece |
| Specification | Value |
|---|---|
| OE references | 12788402-00 · 12788402-00 |
| Approx. weight (packed) | Under 0.5 kg |
| Approx. packaging dimensions | 10 x 9 x 9 cm |
| Country of origin | China |
| Vehicle type | Passenger Car |
Packaging dimensions and weight are approximate and for orientation only. Shipping to Hong Kong SAR is shown above and confirmed at checkout.
Frequently Asked Questions: OE 12788402-00
How do I check this relay against my own vehicle?
Take it in two steps. First, find your model and variant in the fitment table on this page rather than assuming that a marque appearing in the title covers every car wearing the badge. Second, read the rating. This listing is the 12V relay at 40A, and a unit at another rating belongs to a different page even where the two look alike in the hand. The listing names the Sealion 06 and the Song L, so if your car is neither, the table decides it. Ask us on the quote route if it is unclear.
How long does delivery take?
Allow 8 to 25 days for delivery, counted from your order to your door. If your job is booked in, ask us to confirm where OE 12788402-00 stands at the moment, then set the booking around the answer rather than the other way round. The shipping cost for your country is shown on this page and confirmed at checkout before you pay. Before you order, check the number on your old part against OE 12788402-00.
What is the body of this relay made from?
The case is plastic. That describes the body around the relay rather than how it performs, so it mainly matters for handling and storage before the job. Leave the part in its box until it is wanted, since a small part like this is easy to lose once out of its packaging. Nothing about the case identifies the part on its own, so work from the 12V and 40A description on this page when you compare it with the one coming off.
Where on the vehicle is this relay mounted?
Engine Bay, so it is under the bonnet rather than behind cabin trim. That is worth establishing before any panels come off. This page covers the 12V part at 40A for the Sealion 06 and the Song L, and your own model and variant still need checking against the fitment table here. Where you have more than one similar looking relay in front of you and want certainty before ordering, put OE 12788402-00 to us on the quote route and we will confirm what this part covers.
Why is one version of this relay listed rather than two?
That is the whole reason the page shows one tier. It says nothing about whether other suppliers produce something comparable. If you are weighing up an alternative that somebody has quoted you, send us its reference through the quote route and we will tell you whether it answers this listing. Any Aftermarket version added later would show on this page in the usual way.
Related Parts
How Ordering Works
Your order is packed and shipped tracked, and the import duty and VAT that apply to your destination are calculated at checkout. The final gallery image on this page is the process card showing each delivery step. Delivery to Hong Kong SAR: 8 to 25 days, depending on the option you choose at checkout. Shipping to Hong Kong SAR: from $5.05 (Economy), from $10.35 (Express), confirmed at checkout before you pay.





