With 2-Speed Radiator Fan

��Cooling System With 2 Speed Radiator Fan:

WIRING DIAGRAM

Cooling System With 2 Speed Radiator Fan: Component Location:

COMPONENT LOCATION

Cooling System With 2 Speed Radiator Fan: Component ID:

COMPONENT ID

1 Battery in the engine bay.
37 Radiator fan motor on left-hand side of radiator.
75 Distribution block, battery, on the battery tray.
81 2-speed radiator fan relay, in main fuse box in front of battery.
155 Radiator fan relay, in main fuse box in front of battery.
159 Distribution terminal (+15 circuit) in main fuse box behind the glove box.
166 Pressure switch for the radiator fan, on the receiver in front of the right-hand wheel housing.
210 EDU. In main instrument display panel.
231 Distribution terminal (+54 circuit) in main fuse box behind the glove box.
342A Fuse board in main fuse box in front of battery.
366 Motor, 2-speed radiator fan, on left-hand side of radiator.
367 Resistor beside the radiator fan motor.
419 A/C cooling pressure switch (ME), under the radiator on the right- hand side.
433 Relay for disengagement of radiator fan, in main fuse box in front of battery.

2-Pin Connectors
H2-4 Adjacent to the radiator fan motor.
H2-85 Adjacent to the radiator fan motor.

3-Pin Connector
H3-23 Under the front bumper behind the right-hand fog light.

4-Pin Connector
H4-12 Beside the right-hand wheel housing adjacent to the receiver.

10-Pin Connectors
H10-15 Behind the left-hand headlamp.
H10-25 Behind the left-hand headlamp.

Grounding Points
G30 Grounding point on the left-hand structural member, behind the left-hand headlamp.
G31 Grounding point on the right-hand structural member, behind the right-hand headlamp.

DESCRIPTION OF OPERATION
The cooling fans are controlled from the EDU control module.

Irrespective of the position of the ignition switch, power is supplied to relay 155 via fuse 4.

The engine coolant temperature is measured by the EDU control module, which controls relay 155.

Single-Speed Radiator Fan 37
When coolant temperature reaches about 100°C (212°F), relay 155 operates and radiator fan 37 starts. When the temperature drops to about 96°C (205°F), the fan stops.

2-Speed Radiator Tan 366
Some cars are fitted with a 2-speed radiator fan which gives efficient cooling.

Speed 1 works as above.

When the coolant temperature reaches 111°C (232°F), relay 81 is grounded via the EDU control module. The radiator fan then runs at full speed. When the coolant temperature drops to 107°C (225°F), the fan reverts to speed 1.

Relay, Disengagement Of Radiator Fan 433
To prevent the battery from being drained when the radiator fan continues to run after the engine has been switched off, relay 433 breaks the circuit as soon as the ignition is switched off. However, the EDU control module can cause relay 155 to operate so that the fan will continue to run at speed 1, but then only for 3.5 minutes.

Extra Pressure Switch 419
In certain markets, the A/C system is equipped with an extra pressure switch which controls relay 81. If the refrigerant pressure exceeds 22 bar, the contact is closed. This activates relay 81 and engages speed 2 on radiator fan 366.

FAULT DIAGNOSIS HINTS
1-Speed Radiator Fan
1. Check that fuse 4 is intact and live.
2. Check that current is supplied to relay 155.
3. Check that the relay operates and that the radiator fan is working.
4. Run the engine until it reaches operating temperature and check that the EDU control module is in working order.
5. Check connectors and the wiring harness as well as ground connections.

2-Speed Radiator Fan
1. Check that fuse 4 is intact and live.
2. Inspect maxi fuse 2.
3. Check fuse 3.
4. Check that current is supplied to relay 155.
5. Check that the relay operates and that resistor 367 is OK.
6. Run the engine until it reaches operating temperature and check that the EDU control module is in working order.
7. Check connectors and the wiring harness as well as ground connections.