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Home >> Buick >> 2019 >> Encore Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> DTC B0987 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
    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: S70L Steering Wheel Controls Switch - Left
    3. NOTE:

    Verify interior lighting dimming is turned all the way up.

  3. Test for 4 to 11 V between the test points: Control circuit terminal 11 & Ground
    • If less than 4 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1K9 Body Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 5@K9 Body Control Module & 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 5@K9 Body Control Module & Control circuit terminal 11@S70L Steering Wheel Controls Switch - Left
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If greater than 11 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 5@K9 Body Control Module & Ground
      • If greater than 1 V

        Repair the short to voltage on the circuit.

      • If 1 V or less

        Replace the component: K9 Body Control Module

    • Go to next step: If between 4 - 11 V 
  4. Ignition - On / Vehicle - In Service Mode
  5. Connect a test lamp between the test points: Control circuit terminal 11@S70L Steering Wheel Controls Switch - Left & B+
  6. Perform the appropriate scan tool control function: Lane Departure Warning Indicator Command - Cycle On and Off
    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X1K109 Frontview Camera Module
    3. Test for less than 2 ohms between the test points: Control circuit terminal 11@Component harness & Terminal 4@Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K109 Frontview Camera Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: K109 Frontview Camera Module
    3. Test for infinite resistance between the test points: Terminal 4@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K109 Frontview Camera Module
    • Go to next step: If the test lamp turns On and Off 
  7. Test or replace the component: S70L Steering Wheel Controls Switch - Left
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