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HOMESERVICE MANUALSCHEVROLET2019BLAZER PREMIER, FWDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSVEHICLE ACCESS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B153A - LIFTGATE LATCH SWITCHES MALFUNCTIONCIRCUIT/SYSTEM TESTING
2019 Chevrolet Blazer Premier, FWD

Circuit/System Testing

2019 Chevrolet Blazer Premier, FWDSECTION Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: A23C Liftgate Latch Assembly
  3. Verify a test lamp turns On between the test points: Low Reference terminal 6 & B+
    • If the test lamp does not turn On 
    1. Disconnect the electrical connector: K39 Liftgate Control Module
    2. Test for less than 2 ohms between the test points: Low Reference terminal 6 @ Component harness & Terminal 16 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If the test lamp turns On 
  4. Ignition - On/Vehicle - In Service Mode
  5. Verify the scan tool parameter: Body Control Module: Rear Closure Ajar 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 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
    • Go to next step: If the specified state 
  6. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Ratchet Switch = Closed
    • 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 5 @ 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
    • Go to next step: If the specified state 
  7. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Pawl Switch = Closed
    • 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 1 @ 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
    • Go to next step: If the specified state 
  8. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Sector 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 2 @ 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
    • Go to next step: If the specified state 
  9. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 3 & Low Reference terminal 6
  10. Verify the scan tool parameter: Body Control Module: Rear Closure Ajar 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 3 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 3 @ Component harness & Terminal 9 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If the specified state 
  11. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference terminal 6
  12. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Pawl Switch = Open
    • 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 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 1 @ Component harness & Terminal 6 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If the specified state 
  13. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 5 & Low Reference terminal 6
  14. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Ratchet Switch = Open
    • 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 5 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 5 @ Component harness & Terminal 5 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If the specified state 
  15. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Low Reference terminal 6
  16. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Sector 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 2 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 2 @ Component harness & Terminal 4 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If the specified state 
  17. Test or replace the component: A23C Liftgate Latch Assembly
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.