About this part
The 8W0907063CG body control module is the genuine OEM Bosch BCM1 onboard supply control unit (J519) for Audi MLB evo cars, listed here for A4 B9, A5 F5, Q5 FY and Q7 4M applications.
What the module does
The 8W0907063CG is the J519 onboard supply control unit — BCM1 on Audi MLB evo cars. It is the module that decides where battery power goes and when: it manages terminal 30 and terminal 15, distributes supply to the consumers around the car, drives the exterior lighting output stages, runs the wipers and washer pump, the horn, the heated washer jets and a long list of relays that used to be separate boxes. On the cars listed here it also carries the light output diagnostics, which is why one failed output stage can knock out a whole corner of the lighting rather than a single bulb.
Physically it is the tall black unit with three large connector bays (marked A, B and C on the housing) and a fourth smaller bay on the side, bolted behind the dashboard trim on the driver’s side. That position is exactly why water damage is so common: a blocked plenum drain or a leaking windscreen seal puts water where the connectors face up.
The BCM2 comfort module (8W0907064 family) is the other half of the pair — central locking, alarm, immobiliser, interior lighting. BCM1 does not hold the immobiliser data, but it does hold the vehicle’s coding, so a replacement still has to be parameterised to the car.
OE / reference numbers
8W0907063CG · 8W0 907 063 CG. The second line of the label carries the previous revision, 8W0 907 063 BG 013 — base number with index 013 — and above it the current production index 0266. Bosch identification on the same label: BCM1 MLBevo, Bosch number 07013001, serial F005V01927, trace block RB8 — 03220.11.16166600FJ, made in Hungary. The VW and Audi rings together mean one hardware serves both brands.
Do not confuse BCM1 with BCM2. The 8W0907063 family is the onboard supply control module (J519); the 8W0907064 family is the comfort control module (J393). They sit on the same network, use similar housings and are not interchangeable — if your old unit ends in 064 you need the other part, and we stock it separately.
Revisions in this family that dealers list as substitutes: 8W0907063 base, 8W0907063CA, CB, CC, CE, CF, CG, CH, plus the AG, BG, DG and the DA–DH run. They cover different equipment levels — LED or matrix headlights, tow bar, adaptive dampers, market — so a higher letter is not automatically a drop-in for a lower one. Match what is printed on your old label and code the unit afterwards.
When it needs replacing, and what to check first
Several unrelated electrical functions dead at once. Both headlights on one side, the wipers and the horn, or the whole front lighting plus the washer pump — that pattern points at the supply module rather than at the individual components. If only one lamp or one door is affected, look at that circuit first.
No terminal 15, car will not crank, dash dead but battery good. When the module stops switching terminal 15 the car behaves like a flat battery with a healthy one fitted. Check the main fuses and the earth points before condemning the unit — a corroded earth strap gives the identical symptom.
Battery drain overnight. A module that will not go to sleep keeps a consumer alive. Measure the quiescent current after the car has locked and gone quiet; if it stays high, unplug the suspect circuits one at a time rather than replacing the module on a guess.
Water is the usual root cause. Pull the connectors and look at the pins: green corrosion, a white tide mark or a burnt pin means water has been in there. A module that has had water through it can work intermittently for months before it fails outright, and it will usually take a connector or two with it — check the plug bodies as well, not just the module.
Communication codes are not always the module. U-codes (lost communication with control module) usually mean the unit lost power or earth, or the CAN pair is damaged — not that the electronics inside are dead. Read live data and check supply and earth at the connector before you order a replacement.
Compatible vehicles
Fits the models listed below where the old unit carries 8W0 907 063 CG. Equipment level, market and build date decide the final fitment — confirm against the table, the suffix on your old unit and your VIN.
| Make | Model | Years | Engine |
|---|---|---|---|
| Audi | A4 / S4 (B9, 8W2 / 8W5) | 2016 – 2024 | 1.4/2.0 TFSI, 2.0/3.0 TDI, 3.0 TFSI |
| Audi | A4 allroad (B9) | 2017 – 2024 | 2.0 TFSI, 2.0 / 3.0 TDI |
| Audi | A5 / S5 Coupé, Sportback (F5) | 2017 – 2024 | 2.0 TFSI, 3.0 TFSI, 2.0 / 3.0 TDI |
| Audi | RS4 / RS5 (B9 / F5) | 2018 – 2024 | 2.9 TFSI |
| Audi | Q5 / SQ5 (FY, 80A) | 2017 – 2024 | 2.0 TFSI, 2.0 / 3.0 TDI |
| Audi | Q5 PHEV (FY) | 2020 – 2024 | 55 TFSI e |
| Audi | Q7 (4M) | 2016 – 2024 | 2.0 TFSI, 3.0 TFSI, 3.0 TDI |
Fitting and coding — read this before you buy
Disconnect the battery and wait for the network to sleep before touching the connectors; these bays are live with terminal 30 and a slipped spanner will take out a fuse strip or the module itself. Reconnect in the reverse order and check that every latch clicks — a half-seated connector on bay A is the classic cause of a lighting fault that comes back after a week.
Coding is required. The unit has to be parameterised to the car’s equipment — lighting type, tow bar, market, wiper/rain sensor — with ODIS or an equivalent tool, and on most of these cars the access needs an online login. Component protection may also need to be removed. Without that step the module is fitted but the car behaves as if it is not there.
After fitting: clear the fault memory in all addresses, run the basic settings for the wipers and the light output diagnostics, then test every function the module owns — both headlights on dip and main beam, indicators, hazards, wipers on all speeds and park position, washers, horn, and a quiescent current check after locking.
Match the number and the letter
Read the label on the old unit: 8W0 907 063 followed by the index letters, and the second line as well — it usually shows the revision the car was built with. If your suffix differs from CG, send us the VIN and a photo of the label and we will check the supersession before you order. Also check whether your car uses 8W0 907 064 (BCM2) instead: that is a different module.
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 and a clear photo of both lines on the label of the unit in the car, plus the fault codes you are seeing. We will tell you whether it is the supply module, the comfort module, or a wiring fault — 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 Audi body modules, gateways and light control units should ask for a combined quote — we price mixed orders.
