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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (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

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Test 1

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems Off
  2. Disconnect the electrical connector: S45B Liftgate Control Switch - Interior
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 1 & Ground
    • If 10 Ω or greater 
    1. Disconnect Ground Connection
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 1 @ Component harness & Ground Connection
      • 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 
  4. Ignition On/Vehicle In Service Mode
  5. Verify the scan tool parameter: Liftgate Front Control Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 4 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K39 Liftgate Control Module
    • If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 4 & Ground circuit terminal 1
  7. Verify the scan tool parameter: Liftgate Front Control Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 4 @ Component harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 4 @ Component harness & Signal circuit terminal 12 X1 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K39 Liftgate Control Module
    • If the specified state 
  8. Test or replace the component: S45B Liftgate Control Switch - Interior

Test 2

  1. Ignition/Vehicle Off. Disconnect the electrical connector: S45B Liftgate Control Switch - Interior. Ignition On/Vehicle In Service Mode
  2. Verify the scan tool parameter: Liftgate Mode Switch = Greater than 300 counts
    • If 300 counts or less 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K39 Liftgate Control Module
    • If greater than 300 counts 
  3. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 3 & Ground circuit terminal 1
  4. Verify the scan tool parameter: Liftgate Mode Switch = 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 component: S45B Liftgate Control Switch - Interior
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