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Home >> Buick >> 2011 >> Lucerne CX >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Shift Lock Control System >> Diagnostic Information and Procedures >> Transmission Control Lever Malfunction (Floor Shift) >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector X1 at the automatic transmission shift lever assembly.
  2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Install a test lamp between the ground circuit terminal C and the control circuit terminal B.
  4. Ignition ON, command the scan tool BCM Brake To Shift Control output control ON and OFF. The test lamp should turn ON and OFF as commanded.
    • If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If the circuit tests normal, test or replace the shift lock control solenoid.
  6. Ignition OFF, connect the harness connector X1 at the automatic transmission shift lever assembly. Disconnect the harness connector X2 at the automatic transmission shift lever assembly.
  7. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  8. Connect a test lamp between the B+ terminal A and the control circuit terminal B.
  9. Command the Reverse Inhibit ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage open/high resistance. If the circuit tests normal, replace the ECM.
  10. If all circuits test normal, test or replace the shifter assembly.
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