2. CIRCUIT DIAGRAM BY SYSTEMS 1) CONNECTOR AND PIN NUMBER 1 C203, 18pin C311, 12pin Air heater relay (Based on engine harness) Dash - Frame harness (Based on dash harness) Frame - Engine harness (Based on engine harness) Timer Q.O.S unit (Based on dash harness) IG switch "ON" relay (Based on dash harness) Ignition S/W (Based on dash harness) Engine preheater unit (Based on dash harness) 33 8 5 4 1 18 14 13 9 1 4 5 8 9 12 87 85 86 30 1 3 4 6 1 4 5 9 1 4 5 8