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Cooling Fan Relays No. 1, 2 & 3: Es300

  1. Remove cooling fan relay from underhood relay block. Relays are marked FAN NO. 1, FAN NO. 2 and FAN NO. 3. On all relays, ensure continuity is present between relay terminals No. 1 and 2 (Nippondenso), or terminals No. 85 and 86 (Bosch). For relays No. 1 and 2, ensure there is continuity between relay terminals No. 3 and 4 (Nippondenso), or terminals No. 30 and 87a (Bosch). For relay No. 3, ensure there is no continuity between terminals No. 3 and 5. If continuity measurements are not to specification, replace cooling fan relay. If continuity measurements are to specification, go to next step.
  2. For relay No. 1, apply battery voltage and ground across relay terminals No. 1 and 2 (Nippondenso) or terminals No. 5 and 86 (Bosch). There should be no continuity between terminals No. 3 and 4 (Nippondenso) or terminals No. 30 and 87a (Bosch). Replace relay as necessary.
  3. For relay No. 2, apply battery voltage and ground across terminals No. 1 and 2. There should be no continuity between terminals No. 3 and 4, and continuity should exist between terminals No. 3 and 5. Replace relay as necessary.
  4. For relay No. 3, apply battery voltage and ground across terminals No. 1 and 2. There should be no continuity between terminals No. 3 and 5. Replace relay as necessary.
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