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Test FC-27A - Rad Fan Control Relay Circuit (DTC 35)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase fault messages. Using DRB-II, actuate radiator fan relay. If radiator fan relay is clicking, condition required to set fault is not present at this time. Go to next step. If radiator fan relay is not clicking, go to step 5).
  2. RAD FAN CONTROL RELAY CIRCUIT fault sets if radiator fan relay control circuit (Dark Blue/Pink wire) is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or short in radiator fan relay coil windings, open or short in radiator fan relay control circuit (Dark Blue/Pink wire), open or short in radiator fan relay ignition feed circuit (White wire), or failed driver in Powertrain Control Module (PCM). Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform VERIFICATION PROCEDURE VER-2. If no problems were found with wiring and connectors, go to next step.
  4. While still actuating radiator fan relay, wiggle wiring harness from radiator fan relay to Powertrain Control Module (PCM). Stop actuation of radiator fan relay. Using DRB-II, read fault messages. If RAD FAN CONTROL RELAY CIRCUIT fault returned, repair wiring harness as necessary. Perform VERIFICATION PROCEDURE VER-2. If RAD FAN CONTROL RELAY CIRCUIT fault did not return, system is now functioning properly. Perform VERIFICATION PROCEDURE VER-2.
  5. Remove radiator fan relay. Install a known good radiator fan relay. If known good radiator fan relay is clicking, replace original radiator fan relay. Perform VERIFICATION PROCEDURE VER-2. If known good radiator fan relay is not clicking, remove known good radiator fan relay. Put DRB-II in voltmeter mode.
  6. DRB-II should still be actuating radiator fan relay. Using DRB-II, check voltage on radiator fan relay connector, ignition feed circuit (White wire). If voltage is less than 10 volts, repair open in White wire. Perform VERIFICATION PROCEDURE VER-2. If voltage is more than 10 volts, turn ignition off.
  7. Disconnect PCM connector. Put DRB-II in ohmmeter mode. Using DRB-II, check resistance of radiator fan relay connector, control circuit (Dark Blue/Pink wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink wire. Perform VERIFICATION PROCEDURE VER-2.
  8. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of control circuit (Dark Blue/Pink wire) between radiator fan relay connector and PCM connector terminal No. 31. If resistance is more than 5 ohms, repair open in Dark Blue/Pink wire. Perform VERIFICATION PROCEDURE VER-2. If resistance is less than 5 ohms, replace PCM. Perform VERIFICATION PROCEDURE VER-2.
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