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Component Tests: Relays

  1. Remove relay to be tested. Measure between relay terminal No. 5 and all other terminals. See Fig 1 . Resistance should be greater than 5 ohms between terminal No. 2 and all other terminals. Replace relay if resistance is not as specified. If resistance is as specified, go to next step.
  2. Connect battery positive to relay terminals No. 1 and No. 3. Measure voltage between relay terminal No. 4 and battery negative. If battery voltage does not exist at relay terminal No. 4, replace relay. If battery voltage exists at relay terminal No. 4, go to next step.
  3. With battery positive connected to terminals No. 1 and No. 3, connect battery negative to relay terminal No. 2. Measure voltage between relay terminal No. 5 and battery negative. Battery voltage should exist at relay terminal No. 5. Replace relay if voltage is not as specified.
Fig 1: Identifying ISO Micro Relay Terminals
G97E28187Courtesy of MAZDA MOTORS CORP.
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