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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Power Door Lock System And Release Systems >> Diagnostic Information And Procedures >> DTC B396C: Liftgate Mode Switch Circuit Performance Signal Invalid >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S45B Liftgate Control Switch-Interior, ignition ON.
  2. Verify the scan tool Liftgate Mode Switch parameter is greater than 300 counts.
    • If 300 counts or less 
    1. Ignition OFF, disconnect the harness connector at the K39 Liftgate Control Module.
    2. Test for infinite resistance between the signal circuit terminal 3 and ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K39 Liftgate Control Module
    • Go to next step: If greater than 300 counts 
  3. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
  4. Verify the scan tool Liftgate Mode Switch parameter is less than 5 counts.
    • If 5 counts or greater 
    1. Ignition OFF, disconnect the harness connector at the K39 Liftgate Control Module.
    2. 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 K39 Liftgate Control Module
    • Go to next step: If less than 5 counts 
  5. Test or replace the S45B Liftgate Control Switch-Interior.
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