CAS Data Write-Back

Writing modified immobiliser data back to the Car Access System to activate or configure a key slot. Routine over OBD on a car with its original CAS; on a bench job it is the step that can leave a no-start if the write is interrupted or corrupted, which is why every original read is backed up first.

Documented repairs

MINI Cooper Key Programming: CAS3 Key Add on a 2012 Cooper S

2012 MINI Cooper S (R56, N18 1.6L Turbo)

Programming two customer-supplied fobs to a 2012 MINI Cooper S — reading the CAS3/3+ immobiliser data, picking free key slots and personalising each transponder.

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Components

• Aftermarket Key Fob

Engines

• N18 1.6L Turbo

Models

• R56 MINI Cooper S

Repairs by System

• Electrical
• Immobiliser
• Programming

Symptoms

• Unprogrammed Key Fob