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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Keyless Entry System & Remote Functions) >> Diagnostic Information and Procedures >> Keyless Entry System Inoperative (Passive) >> Circuit/System Testing >> Antenna Circuit Malfunction
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Antenna Circuit Malfunction

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the inoperative keyless entry antenna.
  2. Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal A and ground.
    • If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the RCDLR.
  3. Install a DMM between the signal circuit terminal A and the low reference circuit terminal B. Set the DMM to capture AC voltage using the MIN MAX function.
  4. Operate the release handle/touch pad Verify the DMM captured and AC voltage signal.
    • If an AC voltage was not captured, test the signal circuit and the low reference circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the RCDLR.
  5. If all circuits test normal, test or replace the keyless entry antenna.
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