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1. BCM block (body control unit). M57, M59.
2. Rear window defroster switch (built into the air conditioning amplifier).M64, M65 (on models with automatic air conditioning).
3. Rear window defroster switch (built into the heater control panel). M62 (on models without automatic air conditioning).
4. Rear window heater connector B49.
5. Block IPDM E/R E11, E12.