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Home >> Isuzu >> 1999 >> Trooper Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> A/C Clutch Control >> A/C ON Switch/System Test
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A/C ON Switch/System Test

  1. Turn ignition switch to RUN position. Move mode selector switch to any position other than OFF position. With A/C control assembly connected, measure voltage between mode selector switch and ground. For wiring schematics, see WIRING DIAGRAMS article.
  2. Battery voltage should be present. If battery voltage is present, mode selector switch is operating normally. If battery voltage is not present, check wire from mode selector switch to fuse for an open circuit. Also check A/C high and low pressure switches for an open.
  3. Check voltage between mode selector switch wire and ground. Voltage should not be present. If voltage is present, replace mode selector switch.
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