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Home >> Cadillac >> 2015 >> SRX Base, 4D Utility >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Power Door Lock System And Release Systems >> Diagnostic Information and Procedures >> DTC B396C or B396D: Liftgate Interior Release Open/Close Switch Malfunction >> Circuit/System Testing
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Circuit/System Testing

Open/Close Switch Circuit Test

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S45B liftgate control switch-interior. 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 1 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. Verify the scan tool Liftgate Front Control Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K39 liftgate control module.
    2. Test for infinite resistance between the signal circuit terminal 4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K39 liftgate control module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 1.
  6. Verify the scan tool Liftgate Front Control Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the harness connector at the K39 liftgate control module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    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 K39 liftgate control module.
    • If Active 
  7. Test or replace the S45B liftgate control switch-interior.

OFF/ 3/4 position/MAX Switch Circuit Test

  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
    • 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
    • If less than 5 counts 
  5. Test or replace the S45B liftgate control switch-interior.
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