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Home >> Chevrolet >> 2008 >> TrailBlazer 5.3 M, 4WD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information & Procedures >> DTC B1390 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the GBCM.
  2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminals H and F to ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, measure between the battery positive voltage circuit terminals A and C and ground circuit terminals H and F. The readings should not differ by more than 2 volts.
    • If greater than the specified value, test the ignition voltage circuit for a short to ground or an open/high resistance.
  4. If all circuits tests normal, replace the GBCM.
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