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HOMESERVICE MANUALSGMC2019SIERRA 1500 LIMITED BASE, 4WD, GASREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTBODY INTERIORVEHICLE ACCESS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B252ECIRCUIT/SYSTEM TESTING
2019 GMC Sierra 1500 Limited Base, 4WD, Gas

Circuit/System Testing

2019 GMC Sierra 1500 Limited Base, 4WD, GasSECTION Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Connect a test lamp between the test points: Control circuit terminal 11 & Ground
  3. Ignition - On / Vehicle - In Service Mode
  4. Perform the scan tool control function: Child Security Lock Indicator Command - Active & Inactive

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector :X1@K9 Body Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 11@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control circuit terminal 11@Component harness & Control circuit 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: K9 Body Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:X1@K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 11@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
  5. Connect a test lamp between the test points: Control circuit terminal 12 & B+
  6. Perform the scan tool control function: Child Security Lock Indicator Command - Active & Inactive

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X2@K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 12@ 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: Control circuit terminal 12@Component harness & Control circuit terminal 6 X2@Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X2K9 Body Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 12@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
  7. Test or replace the component: S79D Window Switch - Driver
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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.