Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Saturn >> 2009 >> Astra XE, Standard >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Data Communications >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Low Speed GMLAN Device >> Circuit/System Testing >> LS GMLAN initial test

LS GMLAN initial test

  1. Ignition OFF, disconnect the X1 harness connector at the steering column control module (SCCM).
  2. Ignition ON, test for less than 1.0 volt between the low speed GMLAN serial data circuit of the DLC and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage.
  3. Test for infinite resistance between the serial data circuit of the DLC and ground.
    • If less than infinite resistance, test the serial data circuit for a short to ground.
  4. Test for less than 1.0 ohm in the serial data circuit between the DLC and the SCCM.
    • If greater than the specified range, test the serial data circuit for an open/high resistance.
  5. Disconnect the X1 harness connector at the SDM, install a 3A fused jumper wire from the SDM terminal 35 to the harness side of X1.
  6. With a scan tool, attempt to communicate with the IPC.
    • If communication is established, refer to Diagnostic 2.
    • If communication is not established, refer to Diagnostic 1.
scientia non olet · About Mike's Workshop Manuals