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Home >> Cadillac >> 2017 >> CTS Base, AWD >> 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

Without UGN

  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. Test for 10 - 13 V between the control circuit terminal 4 (without UV6) or terminal 3 (with UV6) and ground.
    • If less than 10 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control 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
    3. Test for less than 2 Ω in the control circuit end to end.
    • If greater than 13 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
    • If between 10 - 13 V 
  3. Connect a test lamp between control circuit terminal 8 (with UV6) or terminal 7 (without UV6) and B+.
  4. Verify the test lamp turns ON and OFF when commanding the Vehicle Direction Camera 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.

With UGN

  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. Test for 6.2-10.9 V between the control circuit terminal 4 (without UV6) or terminal 3 (with UV6) and ground.
    • If less than 6.2 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control 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
    3. Test for less than 2 Ω in the control circuit end to end.
    • If greater than 10.9 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
    • If between 6.2-10.9 V 
  3. Connect a test lamp between the control circuit terminal 7 (without UV6) or terminal 8 (with UV6) and B+.
  4. Verify the test lamp turns ON and OFF when commanding the Vehicle Direction Camera 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 K124 Active Safety Control 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 K124 Active Safety Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K124 Active Safety Control 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 K124 Active Safety Control Module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the S48A Multifunction Switch - Instrument Panel.
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