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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B3930 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the X50A fuse block-underhood.
  2. Test for less than 30 Ω between the ground circuit terminal 71 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition OFF, connect the X1 harness connector and disconnect the X2 harness connector at the X50A fuse block-underhood.
  4. Connect a test lamp between the control circuit terminal 13 and ground.
  5. Ignition ON, command the child security lockout by pressing the window lockout switch on the S79D driver door lock/window switch. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  6. If all circuits test normal, replace the X50A fuse block-underhood.
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