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Home >> BMW >> 2000 >> 740i >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating And Air Conditioning - Repair >> Troubleshooting >> 64 99 ... Reading out flashcode >> Instruction:
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64 99 ... Reading out flashcode: Instruction:

Connect inspection lamp to glow plug above peripherals box (pin allocation: refer to DIS circuit diagram). Switch on independent heating via MID or on-board monitor, switch off after 3 minutes running time and, once after-running time has elapsed, count the number of flash pulses.

NOTE: If there is a fault, park heating switches to fault overrun automatically after 2 minutes.