The main and auxiliary fan motors will run at half speed when the A/C system is operating and both of the following conditions occur:

Both fan motors will run at full speed when either of the following conditions occur:

With the ignition switch in ON or START, voltage is applied to the coil of the engine main relay through the ALT fuse; and to the fan no. 1 relay and the fan no. 2 relays through the ECU-IG fuse. Since the engine main relay is permanently grounded at G103, it energizes providing battery voltage to the fan no. 1 relay and the auxiliary fan motor. If the A/C system pressure is below 1226 kPa (178 psi) at the A/C refrigerant pressure switch and the engine coolant temperature is below 93°C (199°F), then ground is provided to the coil of the A/C fan no. 1 and no. 2 relays, thus energizing the relays and opening the circuit to the fan motors. With the ignition switch in ON or START, voltage is applied to the coil of the heater relay. With the blower speed selector switch in any position except OFF, the heater relay is provided a ground at G204 and energizes. Current flows through the closed contacts of the heater relay to the coil of the A/C MG relay. When the A/C switch is pressed to ON, the A/C system is activated and the A/C compressor control module provides a ground path to the A/C MG relay. When the A/C MG relay energizes, voltage is applied through the closed contacts of the A/C MG relay to the coil of the A/C fan no. 3 relay. Since the A/C fan no. 3 relay is permanently grounded at G103 it energizes. When the A/C fan no. 1, 2 and 3 relays and the A/C MG relay are energized, a current path is provided from the A/C auxiliary fan motor through the closed contacts of the A/C fan no. 2 relay, through the closed contacts of the A/C fan no. 3 relay to the main fan motor. The main fan motor is grounded at G103. Since the main fan motor and the A/C auxiliary fan motor are in a series configuration, they both run at half speed.

When the engine coolant temperature reaches 93° C (199° F), the fan control switch opens, or if the A/C system pressure exceeds 1520 kPa (220 psi), then the A/C refrigerant pressure switch opens. In either case, the ground is lost to the coils of the A/C fan no. 1 and 2 relays. Fan no. 1 relay de-energizes and voltage is applied directly to the main fan motor. Since the main fan motor is grounded at G103 it runs at full speed. Fan no. 2 relay also de- energizes and ground is applied to the auxiliary fan motor at G104 and it runs at full speed.

Both fan motors will run at full speed once the engine coolant temperature reaches 93°C (199°F).

Both fan motors will cycle on and off at full speed as the engine coolant temperature increases and decreases.

With the ignition switch in ON or START, voltage is applied to the coil of the engine main relay through the ALT fuse; and to the fan no. 1 relay and the fan no. 2 relays through the ECU-IG fuse. Since the engine main relay is permanently grounded at G103, it energizes providing battery voltage to the fan no. 1 relay and the auxiliary fan motor. When the engine coolant temperature reaches 93°C (199°F), the fan control switch opens and ground is lost to the coils of the fan no. 1 and 2 relays and the relays de-energize. Voltage is applied to the main fan motor and a ground is applied to the auxiliary fan motor at G104. Since each fan motor now has its own power and ground supply, both fan motors run at full speed. When the engine coolant temperature reaches 83°C (181°F), the fan control switch closes thus providing a ground to the fan no. 1 and no. 2 relays. With this ground provided the relays energize, interrupting the current path to both fan motors. It is when this happens that both fan motors stop running.