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Home >> GMC >> 2014 >> Terrain SLT, 4D Utility >> Repair and Diagnosis >> External Pages >> Different car >> Section 335 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B252C: Child Security Lock Switch Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 GMC Terrain and 2015 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A20 Radio/HVAC Controls. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 17 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for greater than 10 V between the signal circuit terminal 11 and ground.
    • If 10 V or less 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If greater than 10 V 
  5. Test or replace the A20 Radio/HVAC Controls.
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