Radiator Fan Control Module Input Test

NOTE: Testing must be performed with radiator fan control module 8-pin connector connected, ignition on and A/C switch in OFF position. If cause of problem is discovered while performing tests, correct problem before continuing tests.

RADIATOR FAN CONTROL MODULE INPUT TESTS

Pin (Wire Color)

Test Condition

Desired Results

1 (Yellow)

Check For Battery Voltage

Battery Voltage ⁽¹⁾

2 (Yellow/Black)

. Check For Battery Voltage .

Battery Voltage ⁽²⁾

3 (Yellow/White)

. Check For Battery Voltage .

Battery Voltage ⁽¹⁾

4 (Black)

Check For Voltage

Below 1 Volt ⁽³⁾

5 (White/Green)

Check For Voltage

About 11 Volts ⁽⁴⁾

6 (White/Green) .

Check For Battery Voltage

Battery Voltage ⁽⁵⁾

7 (Black/Yellow)

. Check For Battery Voltage

Battery Voltage ⁽⁶⁾

8 (Light Green/Yellow)

Connected To Vehicle Ground

Condenser Fan & Radiator Fan Run ⁽⁷⁾

⁽¹⁾	Replace radiator fan control module. Before replacing module, check continuity between condenser fan relay Yellow wire and ground, and radiator fan relay Yellow/White wire and ground. Continuity should not exist.

⁽²⁾	Check fuse No. 8 (7.5-amp) in underdash fuse/relay block. If fuse is okay, repair open in Yellow/Black wire.

⁽³⁾	Repair open to ground.

⁽⁴⁾	Repair short to ground, faulty engine coolant temperature switch "B", or faulty radiator fan control module.

⁽⁵⁾	Check fuse No. 39 (10-amp) in underhood fuse/relay block. If fuse is okay, repair open in White/Green wire.

⁽⁶⁾	Check fuse No. 4 (15-amp) in underdash fuse/relay block. If fuse is okay, repair open in Black/Yellow wire.

⁽⁷⁾

Check Light Green/Yellow wire between radiator fan control module, condenser fan relay and radiator fan relay. If wire is okay, check for open Yellow/White wire between radiator fan control module and condenser fan relay, or open Yellow wire between radiator fan control module and radiator radiator fan control module and radiator fan relay. If wires are okay, test condenser fan relay and radiator fan relay. See RELAY under TESTING.