Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 15 (A/C-HEATER SYSTEM)TESTINGRADIATOR FAN CONTROL MODULE

1998 Acura 3.5RL Special Edition

Radiator Fan Control Module

1998 Acura 3.5RL Special EditionSECTION Radiator Fan Control Module

WARNING: This page is about a different car, the 1998 Acura 3.0CL and 1998 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.

Perform test with radiator fan control module 8-pin connector connected, ignition on and A/C switch OFF. See RADIATOR FAN CONTROL MODULE INPUT TESTS tables. If cause of problem is discovered while performing tests, correct problem before continuing tests.

RADIATOR FAN CONTROL MODULE INPUT TESTS

Pin No.(Wire Color)

Test Condition

Desired Results

1(Yellow)

Check For Battery Voltage

⁽¹⁾ Battery Voltage

2(Yellow/Black) .

Check For Battery Voltage

⁽²⁾ Battery Voltage

3(Yellow/White)

. Check For Battery Voltage

⁽¹⁾ Battery Voltage

4(Black)

Check For Voltage To Ground

⁽³⁾ Less Than 1 Volt

5(White/Green)

Check For Voltage

⁽⁴⁾ Approximately 11 Volts

6(White/Yellow)

Check For Battery Voltage

⁽⁵⁾ Battery Voltage

7(Black/Yellow) .

Check For Battery Voltage

⁽⁶⁾ Battery Voltage

8(Green)

Connected To Body Ground .

⁽⁷⁾ Condenser Fan & Radiator Fan Run

⁽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 fan relay. If wires are okay, test condenser fan relay and radiator fan relay. See RELAYS under TESTING.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.