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Home >> Cadillac >> 2017 >> ATS Base, 2D Coupe, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B153E: Liftgate Position Sensor Signal Circuit Performance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac CT6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle Off. Disconnect the harness connector at the M17 Liftgate Motor Assembly.
  2. Test for less than 20 Ω between the low reference circuit terminal 3 and ground.
    • If 20 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K39 Liftgate Control Module
    2. Test for less than 2 Ω in the low reference 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 20 Ω 
  3. Test for greater than 11 V between the 12 V reference circuit terminal 2 and ground.
    • If 11 V or less 
    1. Ignition/Vehicle Off.Disconnect the X3 harness connector at the K39 Liftgate Control Module.
    2. Test for infinite resistance between the 12 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 12 V reference 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 greater than 11 V 
  4. Test for greater than 11 V between the Position Sensor Signal 1 circuit terminal 7 and ground.
    • If 11 V or less 
    1. Ignition/Vehicle Off.Disconnect the X3 harness connector at the K39 Liftgate Control Module.
    2. Test for infinite resistance between the Position Sensor Signal 1 circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the Position Sensor Signal 1 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 greater than 11 V 
  5. Test for greater than 11 V between the Position Sensor Signal 2 circuit terminal 8 and ground.
    • If 11 V or less 
    1. Ignition/Vehicle Off. Disconnect the X3 harness connector at the K39 Liftgate Control Module.
    2. Test for infinite resistance between the Position Sensor Signal 2 circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the Position Sensor Signal 2 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 greater than 11 V 
  6. Replace the M17 Liftgate Motor Assembly.
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