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Contents Wiring diagrams Section: Cooling Fan All sections

Fan Controls Acura RSX I

Cooling Fan 15 illustrations ~922 words

Scheme 1

Scheme 1: Component Location Index
Scheme 1: Component Location Index

Symptom Troubleshooting Index

SymptomDiagnostic procedureAlso check for
Engine overheatsInspect the water pump (see WATER PUMP INSPECTION ). Check for a broken drive belt (see DRIVE BELT REPLACEMENT ). Check the drive belt auto-tensioner (see DRIVE BELT AUTO-TENSIONER INSPECTION ). Check the thermostat (see THERMOSTAT TEST ). Check for the coolant leakage (from gaskets, hoses, O-rings, etc.). Check for dirt, leaves, or insects on radiator and condenser. Check for damaged or deformed fan shroud. Check for plugged or deteriorated radiator hoses. Check the radiator cap (see RADIATOR CAP TEST ). Inspect the fan motors or fan relays. Check for plugged heater core or hose(s). Check the coolant level. Check for deteriorated coolant. Check for a damaged cylinder head gasket.
The radiator fan does not run at allRadiator fan circuit troubleshooting (see RADIATOR FAN CIRCUIT TROUBLESHOOTING ).Cleanliness and tightness of all connectors
The radiator fan does not run for engine cooling, but it runs with the A/C onRadiator fan switch circuit troubleshooting (Open) (see RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (OPEN) ).Cleanliness and tightness of all connectors
The radiator fan runs with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 199°F (93°C)Radiator fan switch circuit troubleshooting (Short) (see RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (OPEN) ).Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on)A/C condenser fan circuit troubleshooting (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see HOW TO RETRIEVE A DTC ) Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on)Radiator and A/C condenser fan common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see HOW TO RETRIEVE A DTC ) Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both the radiator fan and the A/C condenser fan run with the A/C on)A/C compressor circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see HOW TO RETRIEVE A DTC ) Cleanliness and tightness of all connectors

TROUBLESHOOTING CHART

Scheme 2

Scheme 2: Circuit Diagram
Scheme 2: Circuit Diagram

Scheme 3

Scheme 3: Radiator Fan Circuit Troubleshooting
Scheme 3: Radiator Fan Circuit Troubleshooting

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9
  1. Check the No. 4 (20 A) fuse in the under-hood fuse/relay box, and the No. 14 (10 A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to step 2. NO - Replace the fuse(s) and recheck.
  2. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/rsx/i-2001-2004/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 3. NO - Replace the radiator fan relay.
  3. Measure the voltage between radiator fan relay 4P socket terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 4. NO - Replace the under-hood fuse/relay box.
  4. Connect radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire. Does the radiator fan run? YES - Go to step 5. NO - Go to step 6 .
  5. Disconnect the jumper wire, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 9 . NO - Repair an open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.
  6. Disconnect the radiator fan motor 2P connector.
  7. Check for continuity between radiator fan relay 4P socket terminal No. 2 and radiator fan motor 2P connector terminal No. 2. Is there continuity? YES - Go to step 8. NO - Repair an open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.
  8. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground. Is there continuity? YES - Replace the radiator fan motor. NO - Repair an open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G302.
  9. Turn the ignition switch OFF.
  10. Reinstall the radiator fan relay.
  11. Disconnect the radiator fan switch 2P connector.
  12. Connect radiator fan switch 2P connector terminals No. 1 and No. 2 with a jumper wire. Does the radiator fan run? YES - Replace the radiator fan switch. NO - Go to step 13.
  13. Turn the ignition switch ON.
  14. Remove the jumper wire, and measure the voltage between radiator fan switch connector terminal No. 2 and body ground. Is there battery voltage? YES - Repair an open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G302. NO - Repair an open in the wire between radiator fan switch terminal No. 2 and the under-hood fuse/relay box.

Scheme 10

Scheme 10: Radiator Fan Switch Circuit Troubleshooting (Open)
Scheme 10: Radiator Fan Switch Circuit Troubleshooting (Open)

Scheme 11

Scheme 11
Scheme 11
  1. Disconnect the radiator fan switch 2P connector.
  2. Turn the ignition switch ON (II).
  3. Measure voltage between radiator fan switch 2P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 4. NO - Repair an open in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.
  4. Turn the ignition switch OFF, and check for continuity between radiator fan switch 2P connector terminal No. 1 and body ground. Is there continuity? YES - Replace the radiator fan switch. NO - Repair an open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G302.

Scheme 12

Scheme 12: Radiator Fan Switch Circuit Troubleshooting (Short)
Scheme 12: Radiator Fan Switch Circuit Troubleshooting (Short)
  1. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/rsx/i-2001-2004/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 2. NO - Replace the radiator fan relay.
  2. Remove the radiator fan switch, and test it (see «RADIATOR FAN SWITCH TEST»(/acura/rsx/i-2001-2004/remont/cooling-fan/#fan-controls) ). Is the radiator fan switch OK? YES - Go to step 3. NO - Replace the radiator fan switch.
  3. Disconnect ECM/PCM connector B (24P) and the under-hood fuse relay box 14P connector.
  4. Check for continuity between radiator fan switch 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair a short in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box. NO - Replace the under-hood fuse/relay box.

Scheme 13

Scheme 13: Radiator Fan Switch Test
Scheme 13: Radiator Fan Switch Test

Scheme 14

Scheme 14
Scheme 14
  1. Remove the radiator fan switch from the radiator (see «RADIATOR FAN SWITCH TEST»(/acura/rsx/i-2001-2004/remont/cooling-fan/#fan-controls) ).
  2. Suspend the radiator fan switch (A) in a container of water as shown.
  3. Heat the water, and check the temperature with a thermometer. Do not let the thermometer (B) touch the bottom of the hot container.
  4. Measure the continuity between terminal No. 1 and terminal No. 2 according to the table.
  5. Replace, if necessary, and install the radiator fan switch (see «RADIATOR FAN SWITCH TEST»(/acura/rsx/i-2001-2004/remont/cooling-fan/#fan-controls) ).

Scheme 15

Scheme 15: Radiator Fan Switch Replacement
Scheme 15: Radiator Fan Switch Replacement
  1. Drain the engine coolant (see «COOLANT CHECK»(/acura/rsx/i-2001-2004/remont/cooling-system-mechanical/#cooling-system) ).
  2. Disconnect the radiator fan switch connector, then remove the radiator fan switch (A).
  3. Install the radiator fan switch with a new O-ring (B).
  4. Fill the reserve tank and radiator with engine coolant, and bleed the air from the cooling system with the heater valve open (see step 7 on «COOLANT REPLACEMENT»(/acura/rsx/i-2001-2004/remont/cooling-system-mechanical/#cooling-system) ).