Auxiliary Heater Element Relay: Description and Operation

PTC HEATER CIRCUIT

DESCRIPTION
The GLW RLY turns on when it receives a signal from the A/C amplifier. As a result, power is supplied to the heater glow plug.

GLW RLY1/RLY2 Relay Signal
- Engine running at 850 rpm or more
- ambient temperature 3�C (37.4�F) or less
- engine coolant temperature 75�C (167�F) or less
- A/C switch setting MAX HOT
- blower switch Lo