Radiator (Cooling) Fan Control Test
- Turn ignition off. Disconnect radiator fan relay. Turn ignition on. Measure voltage between radiator fan relay terminals "b" (Purple wire) and "d" (Green/White wire). See Fig 1
and Fig 2
. Battery voltage should be present. If battery voltage is present, go to step 4). If battery voltage is not present, go to next step.
- Check Green, Red and Blue fusible links located in fusible link box next to battery. Replace fusible link(s) as necessary. Check 10-amp fuse located in relay box at left front corner of engine compartment. Replace fuse as necessary. If fusible links and 10-amp fuse are okay, disconnect battery (B +) connector (White wire). Check harness continuity between B + terminal at battery and fan relay harness connector terminal "b". See Fig 1
and Fig 2
.
- Check harness continuity between B + terminal at battery and ignition switch. Check harness continuity between ignition switch and radiator fan relay harness connector terminal "d". See Fig 1
and Fig 2
. Continuity should exist in all checks. If continuity exists in all checks, go to next step. If continuity does not exist in any check, repair open in appropriate wire or connector.
- Install jumper wire between radiator fan relay harness connector terminals "a" and "b". See Fig 1
and Fig 2
. Radiator fan motor should operate. If radiator fan motor does not operate, repair open in Green wire between fan motor and relay harness connector "a". If Green wire is okay, remove jumper wire. Disconnect radiator fan motor connector. Apply battery voltage across fan motor connector terminals. If fan motor does not operate, replace motor. If fan motor operates, check radiator fan relay. See RELAYS
under RELAYS & SOLENOIDS. Replace relay as necessary.
Courtesy of NISSAN MOTOR CO., U.S.A.
Courtesy of NISSAN MOTOR CO., U.S.A.