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Home >> Chevrolet >> 2009 >> TrailBlazer 4.2 S, RWD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC B1492 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the generator and GBCM harness connectors.
  2. Ignition ON and engine OFF, connect a test lamp to B+ and repeatedly probe the generator field duty cycle circuit terminal 2 X1, harness side while monitoring the scan tool ECM GEN-F Terminal Signal parameter. The parameter should change from 0 percent to greater than 95 percent.
    • If the parameter was not affected by the test lamp, test the circuit for a short to voltage, short to ground, or an open/high resistance.
  3. If the circuit tests normal, replace the GBCM
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