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Home >> Buick >> 2011 >> LaCrosse CXS >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Keyless Entry System And Remote Functions) >> Diagnostic Information and Procedures >> DTC B3122 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Verify that the pins are correct for all of the antennas. If DTC B3122 is set, any problems with B3123 has to be fixed first before proceeding to fix the problem with B3122.
  1. Ignition OFF, disconnect the harness connector at the T10J front center console antenna.
  2. Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 1, connector on vehicle side, and vehicle ground and also does not illuminate between low reference signal circuit terminal 2, connector on vehicle side, and vehicle ground.
    • If the test lamp illuminates, disconnect the connector at the keyless entry control module, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the keyless entry control module.
  3. Connect a DMM, set to capture DC voltage using the MIN MAX function, between the signal circuit terminal 1 and vehicle ground.
    4. NOTE: Use DC voltage because comparing to vehicle ground
  4. Activate the front center console antenna by pressing the start/stop button or pulling any exterior door handle or handles. After hitting the min/max button looking for any voltage, verify the DMM captured a DC voltage signal.
    • If the DC voltage was not captured, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the keyless entry control module.
  5. Connect a DMM, set to capture DC voltage using the MIN MAX function, between the low reference circuit terminal 2 and vehicle ground.
  6. Activate the front center console antenna by pressing the start/stop button or pulling any exterior door handle or handles. After hitting the min/max button looking for any voltage, verify the DMM captured a DC voltage signal.
    • If the DC voltage was not captured, test the low reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the keyless entry control module.
    • Clear DTCs then activate the front center console antenna by pressing the start/stop button or pulling any exterior door handle or handles and check for DTCs again.
    • If DTC B3122 returns replace the T10J front center console antenna. Clear DTCs again then activate the front center console antenna by pressing the start/stop button or pulling any exterior door handle or handles and check for DTCs.
    • If DTC B3122 returns, replace the keyless entry control module.
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