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Home >> Chevrolet >> 2008 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC B1420 >> Circuit/System Testing

Circuit/System Testing

  1. If the DTC is history, refer to Charging System Test .
  2. Ignition On and the engine running, test for 9.5-17.5 volts between the battery positive voltage and the ground circuits of the BCM.
    • If not within the specified range, test the B+ circuits for a short to ground or an open/high resistance, and the ground circuits for a open/high resistance.
  3. If all the circuits test normal, test or replace the BCM.
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