Air Conditioning Condenser Fan Grant

Air Conditioning Condenser Fan Grant

To grant operation of the condenser fan, the ECM completes an earth path to the condenser fan relay and the cooling fan 1 relay. The earth path from the ECM (C126-46) is applied to the relay module (C173-3) on a blue and yellow wire and completes the circuit for energizing the condenser and cooling fan 1 relays.

Two feeds from fuse 3 on a brown wire are connected to the main relay (C063-2/C063-4). When the ECM grants the earth path, the main relay (C063-8) supplies a feed on a brown and pink wire which is connected to the relay module on two pins (C173-1 and C173-4). This feed energizes the coils of the A/C compressor clutch relay, the condenser fan relay and the cooling fan 1 and 2 relays.

With the A/C condenser fan grant complete, the condenser fan and the cooling fan are operated in parallel (fast mode), each fan receiving its power supply from a separate source.

A feed from fuse 2 (C572-2) in the engine compartment fusebox passes to the relay module (C172-8) on a brown and white wire. The feed passes through the condenser fan relay whose contacts have been closed by the A/C grant. From the relay module (C172-3), the feed passes on a slate and blue wire to the condenser fan motor (C280-1). The condenser fan (C280-2) is earthed on a black wire.