About this part
The 5WA937084AD body control module is the genuine OEM Continental BCM37 central electrics unit (J519) for MQB evo cars, listed here for VW Golf 8, Tiguan, Passat B9, Skoda Octavia IV, Kodiaq II, Superb IV and SEAT Leon IV applications.
What the module controls
The 5WA937084AD is the J519 central electrics / body control module on the MQB37W platform — the generation that replaced the old separate supply and comfort boxes with one unit. On the cars listed here it owns:
• Exterior lighting — dip, main beam, indicators, position lamps, brake and reverse lamps, plus the output diagnostics that report a failed LED.
• Wipers and washers — the wiper motor is a LIN slave of this module, so a dead wiper with a good motor and good fuse usually means the module has lost the LIN leg.
• Central locking and windows — lock/unlock requests, deadlock, child lock, comfort closing, and the door status the car uses for its leaving-home and coming-home lighting.
• Alarm and interior monitoring — alarm horn and interior sensor are LIN subsystems of this unit.
• Interior lighting, rain/light sensor, light switch — all LIN slaves, which is why one dry joint inside the module can take out several unrelated-looking functions at once.
Physically it is the flat black box with three large connector bays marked A, B and C and a small centre bay, mounted behind the dash on the driver’s side with the connectors facing up — which is exactly why water damage is common after a blocked plenum drain or a leaking windscreen.
How to read the two lines on the label
5WA 937 084 AD is the software part number, followed by 1290, the software version. The second line, 5WA 937 084 R H26, is the hardware: R is the hardware part number and H26 the hardware index. On MQB evo cars those two lines travel separately — VW can put new software (AD) on an existing hardware (R) — so a used unit ending in R is not automatically the same thing as an AD unit, and a unit with the right hardware but older software will need flashing.
Other identifiers on this label: VW AG, ECEDSSV2 BCM37wBL (the internal model name — VCDS shows it as BCM37w_H, ASAM data set EV_BCMwBL), component number A3C12643802, Continental part A2C11974005 >PP-MD40<, production string 8PO-CGQ.25.03.2513870868, made in China, plus three date clocks and the radio approvals (FCC ID KR5BCASTVWL, UKCA, CE, R-NZ, ANATEL, IFETEL).
This is not a 5Q0 937 084. The 5Q0 family is the older BCM MQBAB unit used on Golf 7, T-Roc and Tiguan AD1 up to 2023 — different ASAM data set (EV_BCMMQB), different connector layout, not interchangeable with this one. If your old unit starts with 5Q0, you need the other part; we stock that family separately.
Suffixes that appear in this family and are frequently offered as substitutes: 5WA 937 084 AA, AC, AD, AE, AF, AG, AR, plus the Q and R hardware run. They differ in equipment level (LED or matrix headlights, trailer module, keyless entry, market) and in software. Match the label and code the unit afterwards — a higher letter is not automatically a drop-in.
When it needs replacing, and what to check first
Several unrelated functions dead together. Both headlamps on one side plus the wiper, or locking plus interior lights — that combination points at the module or its supply, not at the individual consumers. One lamp or one door on its own is almost never the BCM.
U-codes everywhere. Lost communication codes usually mean the unit lost terminal 30, a ground, or a CAN pair — check supply, earth and the connector pins before condemning the box. A corroded earth stud gives exactly the same fault memory as a dead module.
Battery flat overnight. A module that will not go to sleep keeps a consumer awake. Measure quiescent current after the car has locked and gone quiet; if it stays high, unplug circuits one at a time rather than guessing.
Water evidence. Pull the three connectors and look at the pins: green corrosion, a white tide mark or a burnt pin means water has been in there. A wet module can work intermittently for months and will usually take a plug body with it — check the connectors as well, not just the unit.
Before buying, rule out the software recall. Some 2025 Tiguan units built with BCM software 5WA 937 084 AE / AF / AG at versions 0324 and 0325 were recalled because the module could reset while driving. That is fixed by a software flash at a dealer, not by a new module — if your car is covered by that campaign, get the update first.
Compatible vehicles
Fits the models listed below where the old unit carries 5WA 937 084 with the matching suffix. Equipment level, market and build date decide the final fitment — confirm against the table, both lines on your old label and your VIN.
| Make | Model | Years | Engine |
|---|---|---|---|
| VW | Golf VIII (CD1) | 2019 – 2024 | 1.0/1.5 TSI, 1.4 GTE, 2.0 TDI |
| VW | Golf VIII Alltrack (CG5) | 2020 – 2024 | 2.0 TDI 4motion, 2.0 TSI 4motion |
| VW | Tiguan (AD1 / AD3) | 2023 – 2026 | 1.5 TSI, 2.0 TSI, 2.0 TDI |
| VW | Tiguan Allspace (AD1) | 2024 – 2026 | 1.5 TSI, 2.0 TSI, 2.0 TDI |
| VW | Passat (B9, 3G2 / 3G5) | 2023 – 2026 | 1.5 eTSI, 2.0 TSI, 2.0 TDI |
| Skoda | Octavia IV (NX3 / NX5) | 2019 – 2026 | 1.0/1.5 TSI, 1.4 iV, 2.0 TDI |
| Skoda | Kodiaq II (PS7) | 2024 – 2026 | 1.5 TSI mHEV, 1.5 iV, 2.0 TDI, 2.0 TSI 4×4 |
| Skoda | Superb IV (NZ3 / NZ5) | 2023 – 2026 | 1.5 TSI mHEV, 1.5 iV, 2.0 TDI, 2.0 TSI |
| SEAT / Cupra | Leon IV, Leon Sportstourer (KL1 / KL8) | 2019 – 2024 | 1.0/1.5 TSI, 1.4 e-Hybrid, 2.0 TDI |
Fitting and coding — read this before you buy
Battery off, network asleep, then unplug. These bays carry terminal 30 permanently. Reconnect in the reverse order and listen for every latch — a half-seated bay A connector is the classic cause of a lighting fault that returns a week later.
Coding is mandatory and access is locked. The module must be parameterised to the car’s equipment — lighting type, trailer, market, keyless, wiper/rain sensor — and on MQB evo cars the diagnostic access is protected by SFD / SFD2. That means an online token from the manufacturer’s server is needed even with ODIS; a generic tool cannot unlock it. Plan for a dealer or an independent with a valid subscription.
Matching used units. A used BCM37 brings the previous car’s coding and its component protection state. Coding can be re-entered, but component protection has to be removed online, and immobiliser-related data is tied to the car — in practice most workshops clone the old unit’s data rather than trying to adapt a used one from scratch.
After fitting: clear all addresses, run basic settings for the wipers and the light diagnostics, then test every function the unit owns — both headlamps on dip and main beam, indicators, hazards, wipers on all speeds and park, washers, locking and deadlock, comfort closing, interior lights, alarm — and finish with a quiescent current check after locking.
Match both lines on the label
Read the old unit: first line 5WA 937 084 plus the software index and version, second line the hardware part and index (for example R H26). Send us a photo of both lines and your VIN and we will confirm the supersession before you order. Also check whether your car uses the earlier 5Q0 937 084 BCM — that is a different generation and does not fit.
Shipping and packing
Orders leave within one to two working days of cleared payment, in an anti-static bag with the connector bays protected. Tracking is emailed when the parcel is handed to the carrier. Customs charges, where they apply, are the buyer’s responsibility.
Condition & warranty
Brand new, twelve months warranty against manufacturing defects. The warranty covers the unit as supplied: it does not cover a module that has been coded to a vehicle, one with component protection removed, or one damaged by incorrect fitting, water ingress, reverse polarity or voltage spikes. Coding, diagnostic and labour costs are not included. If a unit is faulty on arrival, send us the fault memory log before returning anything.
Not sure this is the right module?
Send us the VIN, a clear photo of both label lines and the fault codes you are seeing. We will tell you whether it is the body control module, a wiring fault or something else — that answer is free, and it saves you buying the wrong box.
Wholesale
Tiered pricing for 1 pc, 5 pcs and 20 pcs is shown below. Workshops and auto-electricians stocking VAG body modules, gateways and light control units should ask for a combined quote — we price mixed orders.
