Radiator Fan Control Module

Perform test with radiator fan control module connector connected, ignition on and A/C switch OFF. See Fig 1 . Also, refer to the RADIATOR FAN CONTROL MODULE INPUT TESTS table. If cause of problem is discovered while performing tests, correct problem before continuing tests.

Fig 1: Identifying Fan Control Module Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

RADIATOR FAN CONTROL MODULE INPUT TESTS

Pin No. (Wire Color)

Test Condition

Desired Results

1 (Black)

Check For Voltage To Ground

⁽¹⁾ Less Than 1 Volt

2 (White)

Check For Battery Voltage

⁽²⁾ Battery Voltage

3 (Black/Yellow)

Check For Battery Voltage

⁽³⁾ Battery Voltage

4 (Black/Yellow)

Check For Battery Voltage

⁽⁴⁾ Battery Voltage

5 (Yellow/White)

Check For Battery Voltage

⁽⁵⁾ Battery Voltage

6 (Yellow)

Check For Battery Voltage

⁽⁵⁾ Battery Voltage

7 (Green)

Connected to Body Ground

⁽⁶⁾ Condenser Fan & Radiator Fan Run

8 (White/Green)

Check For Voltage

⁽⁷⁾ About 11 Volts

⁽¹⁾	Repair open to ground.

⁽²⁾	Check fuse No. 58 (20-amp) in underhood fuse/relay box. If fuse is okay, repair open in White wire.

⁽³⁾	Check fuse No. 6 (15-amp) in underdash fuse/relay box. If fuse is okay, repair open in Black/Yellow wire.

⁽⁴⁾	Check fuse No. 3 (7.5-amp) in underdash fuse/relay box. If fuse is okay, repair open in Black/Yellow wire

⁽⁵⁾	Replace radiator fan control module. Before replacing module, disconnect both fan relays. Check continuity between ground and Yellow/White wire (or Yellow wire). Continuity should not exist.

⁽⁶⁾

Check fuse No. 58 (20-amp) in underhood fuse/relay box. Check for an open in Green wire between the 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 fan relay. If wires are okay, test condenser fan relay and radiator fan relay. See RELAYS under TESTING.

⁽⁷⁾	Engine coolant should be below 225 °F (107 °C). Repair short to ground, faulty radiator fan switch "B", or faulty radiator fan control module.