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GBCM Signal Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the GBCM.
  2. Ignition ON, verify the scan tool ECM GEN-F Terminal Signal is less than 5%.
    • If greater than the specified range, test the signal circuit terminal B for a short to voltage.
  3. Install a 3 A fused jumper wire between the signal circuit terminal B and B+. Verify the scan tool ECM GEN-F Terminal Signal is greater than 95%.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the GBCM.
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