LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2011 >> Aveo LS, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> DTC U0100 - U02FF >> Circuit/System Testing

Circuit/System Testing

NOTE: Use the schematic to identify the following:
  • Control modules the vehicle is equipped with
  • Control module locations on the low and high speed GMLAN serial data circuits
  • The control modules B+, ignition, ground, communication enable and serial data circuit terminals
  1. Determine the module that is not communicating.
  2. Ignition OFF, disconnect the necessary harness connector of the module that is not communicating.
  3. Inspect the harness connectors of the module that is not communicating for poor connections and terminal tension.
    • If a terminal is damaged, correct or repair the concerned connector.
  4. Test for less than 5 Ω between each ground circuit terminal and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. If equipped, verify that a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
  6. If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
  7. If equipped, ignition ON, verify that a test lamp illuminates between the communication enable circuit terminal or the accessory wakeup circuit terminal and ground.
    • If the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuits test normal, replace the body control module (BCM).
  8. Ignition OFF for 60 s, test for less than 5 Ω between the serial data circuit terminals and the DLC terminal listed below:
    • Low speed GMLAN serial data terminal 1
    • High speed GMLAN serial data terminal 6 or 14
    • If greater than the specified range, test the serial data circuit for an open/high resistance between the non communicating control module and a module setting the DTC or a serial data splice pack.
  9. If all circuits test normal, replace the control module that is not communicating.
scientia non olet · About LEMON Manuals