LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC B137B >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector X1 at the APM.
  2. Ignition ON, verify that a test lamp illuminates between the wake up signal circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
  3. Ignition OFF and scan tool disconnected, verify that a test lamp does not illuminate between the signal circuit terminal 3 and ground.
    • If the test lamp illuminates, test the circuit for a short to voltage.
  4. If all circuits test normal, replace the APM.
scientia non olet · About LEMON Manuals