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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 330 (ACCESSORY POWER SOCKET)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER OUTLET RECEPTACLE INOPERATIVECIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Testing

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION 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.
  1. Ignition OFF, disconnect the harness connector at the accessory power outlet.
  2. Engine running, verify that a test lamp illuminates between the ignition voltage circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, disconnect the harness connectors at the accessory power inverter module.
  4. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 1 X2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Verify that a test lamp illuminates between the B+ circuit terminal 2 X2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. Ignition OFF, connect the harness connector to the accessory power outlet.
  7. Test for less than 2 ohms between the following terminals:
    • The phase A circuit terminal 6 X1 at the module harness, and the hot terminal at the accessory power outlet
    • The phase B circuit terminal 4 X1 at the module harness, and the neutral terminal at the accessory power outlet
    • If greater than the specified range, test the appropriate circuit for an open/high resistance. If the circuit tests normal, test or replace the accessory power outlet.
  8. Test for infinite resistance between the following terminals at the module harness and ground:
    • The phase A circuit terminal 6 X1
    • The phase B circuit terminal 4 X1
    • If less than the specified value, test the appropriate circuit for a short to ground. If the circuit tests normal, test or replace the accessory power outlet.
  9. Test for greater than 1 megohm between the phase A circuit terminal 6 X1 and the phase B circuit terminal 4 X1.
    • If less than the specified range, test the phase A circuit and the phase B circuit for a shorted together condition. If the circuits test normal, test or replace the accessory power outlet.
  10. Connect an AC-powered device to the accessory power outlet.
  11. Engine running, verify that a test lamp illuminates between the signal circuit terminal 2 X1 and ground.
    • If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the accessory power outlet.
  12. If all circuits test normal, replace the accessory power inverter module.
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