AUDI BCM2 SMART KEYS

   AUDI Q5, A5, A6 4G C7 SMART KEY BCM2

GENERAL INFORMATION

Audi Silver SmartKey, also called Audi BCM2 Key with PCF7945 MCU is used in several Audi models since 2008.
The manufacturer specifies the following parts number :


- 8T0xxx for Audi Q5, Audi A4/S4/RS4, Audi A5/S5 ( 8T0 959 754F, 8T0 959 754D, 8T0 959 754G, 8T0 959 754A etc )
- 4G0xxx for Audi A6/S6/RS6/Allroad ( 4G0 959 754G, 4G0 959 754K, 4G0 959 754BP, 4G0 959 754DC etc )
- 4H0xxx for Audi A8/S8, A7/S7 ( 4H0 959 754DD, 4H0 959 754DC, 4H0 959 754G, 4H0 959 754K etc )
- 8K0xxx for Audi Q5 ( from 2013 ), Audi A4/S4/RS4, Audi A5/S5 ( 8K0 959 754BR, 8K0 959 754K, 8K0 959 754D etc )

Not always, but in many cases such keys are compatible and can be used interchangeably;
i.e. you can program key from Audi A4 to Audi A6 and you can start the car, but it is possible that remote control will not work.

Some of the keys do not support Comfort Access. If you program such key to a car with CA - Keyless Go / Entry will not work. Which key support Comfort Access ? You can find via OEM Part Number or by LF-Coil on PCB of key.

RENEW ( VIRGINIZE ) USED AUDI BCM2 SMART KEYS

From some time on the market exist several programmers with PCF79xx MCU support.
With the help of such programmers you can perform read and write PCF7945 MCU data; Hence - renewing Audi BCM2 key.
Some of such tools ( MK3, RemUnlocker for example ) virginize keys in automatic mode without advanced features.
Others ( PCFprog, VVDIprog for example ) have more features, but require to have virgin files for renew used Audi BCM2 Keys.

Virginize used Audi BCM2 Keys is very simple , just remember about correctly PCB, OEM Part Number and frequency.
If you programm key with wrong file ( other PN or PCB ) - the key will not damage, but will not work at all or properly.

PCB AND CONNECTION DIAGRAM FOR OEM AUDI BCM2 SMART KEYS :

PCB AND CONNECTION DIAGRAM FOR OEM AUDI BCM2 SMART KEYS
Audi A6/S6/RS6/Allroad 4G0 959 754G, 4G0 959 754K, 4G0 959 754BP, 4G0 959 754DC