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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1577 (THEFT DETERRENT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSHOCK SENSOR INOPERATIVECIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Circuit/System Testing

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Without Accessory Inclination Sensor

  1. Ignition OFF, disconnect the harness connector at the shock sensor.
  2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Test for B+ between the signal circuit terminal B and ground.
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, connect the harness connector at the shock sensor. Disconnect the X7 harness connector at the BCM.
  5. Ignition ON, test for B+ between the signal circuit terminal 15 and ground.
    • If not the specified value, test the signal circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the shock sensor.
  6. If all circuits test normal, test or replace the shock sensor.

With Accessory Inclination Sensor

  1. Ignition OFF, disconnect the harness connector at the shock sensor and the harness connector at the inclination sensor.
  2. Ignition ON, verify a test lamp illuminates between the shock sensor B+ circuit terminal A and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Test for B+ between the signal circuit terminal B and ground.
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, connect the harness connector at the shock sensor. Disconnect the X7 harness connector at the BCM.
  5. Ignition ON, test for B+ between the BCM signal circuit terminal 15 and ground.
    • If not the specified value, test the signal circuit for a short to ground or and open/high resistance. If the circuit tests normal, test or replace the shock sensor.
  6. Ignition OFF, connect the harness connector at the inclination sensor.
  7. Ignition ON, test for B+ between the BCM signal circuit terminal 15 and ground.
    • If not the specified value, test or replace the inclination sensor.
  8. If all circuits test normal, test or replace the shock sensor.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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