Glow plug indicator lamp: Notes

Fig 1: Identifying Glow Plug Indicator Lamp Communication Flow Line

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Glow Plug Indicator Lamp Communication Flow Line

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The glow plug indicator lamp comes on during preheating.

The lamp is powered from the main instrument unit and grounded internally by the main instrument unit. The diesel engine control module continuously sends the bus information Glow Plug, unit ON/OFF.

On Glow Plug ON, the control module grounds the output for the lamp which is then lit.