I have checked the www and found the following info from bmwgm5.com about the fault.
Copy from that page the fault and code.
ZKE 2 (0x02) - Fuse for ZV ZKE 7 (0x07) - Module not coded {Signal STDWA (only relevant if an anti-theft alarm is fitted)
ZKE 9 (0x09) - Front Window Relay Left Side (Drivers Side)
ZKE 10 (0x0A) - Front Window Relay Right Side (Passenger Side)
ZKE 39 (0x27) - Central Locking Relays, Driver Door Unlocking (R2bNC)
ZKE 40 (0x28) - Central Locking Relays, Passenger Door Locking (R1aNO)
ZKE 41 (0x29) - Central Locking Relays, Driver & Passenger Door Unlocking {Relay for central locking - ulocking or Relay for rear FH drive (passenger's side) sticks} (R1bNO)
ZKE 42 (0x2A) - Relay for central locking, double locking
ZKE 43 (0x2B) - Central Locking Relays, Driver Door Locking (R2bNO)
ZKE 48 (0x30) - Wire to relay module -passenger's side FH, rear
ZKE 51 (0x33) - Wipers: blocking protection active
61 (0x3D) - Fuse for passenger- compartment sensor
66 (0x42) - Connection for relay module to power window driver side front faulty
ZKE (0x81) - DWA alarm memory: door contact, driver's door
ZKE (0x85) - DWA alarm memory: tailgate
ZKE (0x88) - DWA alarm memory: hood
Based on the fault code, it look like you dont need to replace the GM5 but only the appropriate item that is giving the problem.