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Home >> Acura >> 1993 >> Integra GS-R >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> A/C-Heater System - Manual >> Testing >> Fan Timer Unit Input
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Fan Timer Unit Input

  1. Locate fan timer unit on right side of heater unit, but DO NOT disconnect harness connector. Turn ignition on. Ensure A/C switch is off. Using a DVOM, backprobe between terminal No. 4 (Black wire) and chassis ground. See Figure .
  2. If voltage is greater than zero but less than one volt, go to next step. If voltage is greater than one volt, repair open circuit or poor connection in Black wire between fan timer unit and ground.
  3. Check for voltage between terminal No. 6 (White wire) and ground. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, check fuse No. 20. If fuse is okay, repair open circuit in White wire between fuse block and fan timer unit.
  4. Check for voltage between terminal No. 7 (Black/Yellow wire) and ground. See Figure . Battery voltage should exist with ignition on. If voltage is as specified, go to next step. If voltage is not as specified, check fuse No. 24. If fuse is okay, repair open circuit in Black/Yellow wire between fuse block and fan timer unit.
  5. Check for voltage between terminal No. 2 (Yellow/Black wire) and ground. See Figure . Battery voltage should exist with ignition on. If voltage reading is as specified, go to next step. If voltage is not as specified, check fuse No. 21. If fuse is okay, repair open circuit in Yellow/Black wire between fuse block and fan timer unit.
    CAUTION: Before replacing fan timer unit, turn ignition off. Using an ohmmeter set to 20,000-ohm scale, check for continuity between terminal No. 1 (Yellow/White wire) of timer connector and chassis ground. If continuity exists, new fan timer unit will be damaged when connected. Repair short circuit in Yellow/White wire before connecting fan timer unit.
  6. Check for voltage between terminal No. 1 (Yellow/White wire) and ground. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, replace fan timer unit.
  7. Using a jumper wire, connect terminal No. 8 (Blue/Red wire) to ground. See Figure . If radiator fan runs, go to next step. If condenser fan does not operate, check for open circuit in Blue/Red wire between fan timer unit and condenser fan relay.
  8. If wire is okay, check for open circuit in Yellow/White wire between fan timer unit and 2-pin connector (located near radiator), and Black/Yellow wire between 2-pin connector and condenser fan relay. If wiring is okay, test condenser fan relay. See TROUBLE SHOOTING -INTEGRA charts in this article.
  9. Check for voltage between terminal No. 5 (White/Green wire) and ground. See Figure . With engine oil temperature less than 226°F (108°C), voltage should be approximately 11 volts. If voltage is not as specified, check for short to ground in White/Green wire. If wire is okay, check oil temperature switch. If oil temperature switch is okay, install a known good fan timer unit. Retest system.
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