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Home >> Buick >> 2017 >> Verano Base, Gas >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection System And Pedestrian Protection System >> Diagnostic Information and Procedures >> DTC B0987: Vehicle Direction Camera Indicator Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel, ignition ON.
    NOTE:

    Verify interior lighting dimming is turned all the way up.

  2. Verify a test lamp illuminates between the BCM PWM control circuit terminal 12 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. If the fuse is OK, replace K9 Body Control Module.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K109 Frontview Camera Module.
    • If the test lamp illuminates 
  3. Connect a test lamp between control circuit terminal 11 and B+.
  4. Verify the test lamp turns ON and OFF when commanding the Lane Departure Warning Indicator Status parameter On and Off with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K109 Frontview Camera Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K109 Frontview Camera Module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the S48A Multifunction Switch - Instrument Panel.
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