15.24.1 Functional check (P0670), (P064C), (U0106)

General description: 

The glow ECU monitors itself for several malfunctions. These malfunctions are:

• EEPROM Error
• supply power loss
• internal hardware error
• temperature exceeds
• ground error

If the glow ECU sends a fault to the ECU longer then debounce time, a fault is detected and a preliminary fault code is stored. If this fault is detected in two consecutive driving cycles, the MIL is illuminated.

Flowchart: 

Fig 1: Glow Plug System Control Module Flowchart

Courtesy of BMW OF NORTH AMERICA, INC.