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Contents Wiring diagrams Section: Cooling Fan All sections

Fan Controls Acura ZDX I

Cooling Fan 10 illustrations ~824 words

Scheme 32

Scheme 32: Component Location Index
Scheme 32: Component Location Index

Symptom Troubleshooting Index

SymptomDiagnostic ProcedureAlso check for
Engine overheatsCheck the coolant level. Check for any engine coolant leakage (from gaskets, hoses, O-rings, etc.). Check for dirt, leaves, or insects on the radiator and A/C condenser. Check for deteriorated coolant. Check for damaged or deformed fan shrouds. Check that the fan motors are operating properly (air should be blowing toward the engine). Inspect the fan motors (see FAN MOTOR TEST ) or fan relays: A/C condenser fan relay (see POWER RELAY TEST ) Relay circuit board (see RELAY CIRCUIT BOARD TEST ) Check the radiator cap (see RADIATOR CAP TEST ). Check the thermostat (see THERMOSTAT TEST ). Inspect the water pump (see WATER PUMP INSPECTION ). Check for plugged or deteriorated radiator hoses. Check for a plugged heater core or hoses. Check for a damaged cylinder head gasket.Check the radiator and A/C condenser fan are operating properly
The radiator fan does not run at high speedRadiator fan high speed circuit troubleshooting (see RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ).Check the connectors are properly connected and the terminals are making good contact
Both the radiator fan and the A/C condenser fan do not run at low speedRadiator and A/C condenser fans low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING ).Check the connectors are properly connected and the terminals are making good contact
The A/C condenser fan does not run at high speedA/C condenser fans high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ).Check the connectors are properly connected and the terminals are making good contact

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Scheme 33: Without Keyless Access System
Scheme 33: Without Keyless Access System

Scheme 34

Scheme 34: With Keyless Access System
Scheme 34: With Keyless Access System

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Scheme 35: Radiator Fan High Speed Circuit Troubleshooting
Scheme 35: Radiator Fan High Speed Circuit Troubleshooting

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Scheme 41
  1. Check the No. 3-5 (40 A) fuse, the No. 14 (15 A) fuse, the No. 3-2 (40A), and the No. 21 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box. Are the fuse(s) OK? YES -Reinstall the fuse(s), then go to step 2. NO -Replace the fuse(s) and recheck. If the fuse continues to blow, locate and repair the short in the circuit between the under-hood fuse/relay box and the radiator fan motor, the under-hood fuse/relay box and the A/C condenser fan motor, and driver's under-dash fuse/relay box connector terminal F26 and under-hood fuse/relay box connector terminal B1.
  2. Disconnect and remove the relay circuit board (see «RELAY CIRCUIT BOARD TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__relay-circuit-board-test) ) and the A/C condenser fan relay from the under-hood fuse/relay box, and test its; relay circuit board (see «RELAY CIRCUIT BOARD TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__relay-circuit-board-test) ), A/C condenser fan relay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Are the relay circuit board and/or the A/C condenser fan relay OK? YES -Go to step 3. NO -Replace the relay circuit board and/or the A/C condenser fan relay.
  3. Measure the voltage between under-hood fuse/relay box connector terminal C3 and body ground. Is there battery voltage? YES -Go to step 4. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ).
  4. Connect under-hood fuse/relay box connector terminals C1 and C3 with a jumper wire. Does the radiator fan run at high speed? YES -Go to step 8 . NO -Go to step 5.
  5. Disconnect the radiator fan motor 2P connector, then test the fan motor (see «FAN MOTOR TEST»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ). Is the fan motor OK? YES -Go to step 6. NO -Replace the radiator fan motor (see «FAN, FAN MOTOR, AND SHROUD REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ), then retest.
  6. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground. Is there continuity? YES -Go to step 7. NO -Repair an open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground G301.
  7. Check for continuity between under-hood fuse/relay box connector terminal C1 and radiator fan motor 2P connector terminal No. 2. Is there continuity? YES -Check for poor connections or loose terminals at the under-hood fuse/relay box and the radiator fan motor, the radiator fan motor and body ground G301. NO -Repair an open in the wire between under-hood fuse/relay box connector terminal C1 and radiator fan motor 2P connector terminal No. 2.
  8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  9. Measure the voltage between under-hood fuse/relay box connector terminal B1 and body ground. Is there battery voltage? YES -Go to step 10. NO -Repair an open in the wire between driver's under-dash fuse/relay box connector terminal F26 and under-hood fuse/relay box connector terminal B1.
  10. Measure the voltage between under-hood fuse/relay box connector terminal B9 and body ground. Is there battery voltage? YES -Go to step 11. NO -Check the PGM-FI sub relay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). If the relay is OK, replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ).
  11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  12. Connect the HDS to the DLC (see step 2 on «HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
  13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  14. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit (see «PCM POWER AND GROUND CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
  15. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode. NOTE: This step must be done to protect the PCM from damage.
  16. Disconnect PCM connector A (49P).
  17. Check for continuity between PCM connector terminal A5 and under-hood fuse/relay box connector terminal B10. Is there continuity? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair an open in the wire between under-hood fuse/relay box connector terminal B10 and PCM connector terminal A5.

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