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THERMO Time Switch: BMW

  1. Disconnect electrical connector at thermo time switch. Connect ohmmeter to terminal "G" and ground. Reading should be 40-70 ohms.
  2. Connect ohmmeter between terminal 85 ("W" on switch) and ground. Connect terminal 86 with terminal 30 ("G" on switch). For temperatures above 59°F (15°C), infinity reading should be obtained. Below 59°F (115°C), zero reading should be obtained for 0-8 seconds.
    NOTE: Terminal "W" on 528i thermo time switch is connector terminal number 86c.
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