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Home >> GMC >> 2016 >> Yukon Denali, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Object Detection System And Pedestrian Protection System) >> Diagnostic Information and Procedures >> DTC B390F: Frontview Camera >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 GMC Yukon XL, 2015 GMC Yukon, 2015 Chevrolet Tahoe, 2015 Chevrolet Suburban, and 2015 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the B174G Frontview Camera - Grille harness connector. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K157 Video Processing Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K157 Video Processing Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for 4.8-7.2 V between the 6 V reference circuit terminal 5 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K157 Video Processing Control Module.
    2. Test for infinite resistance between the 6 V reference 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 6 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K157 Video Processing Control Module.
    • If greater than 7.2 V 
    1. Ignition OFF, disconnect the harness connector at the K157 Video Processing Control Module, ignition ON.
    2. Test for less than 1 V between the 6 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K157 Video Processing Control Module.
    • If between 4.8-7.2 V 
  5. Ignition ON.
  6. Test for less than 10 V between the signal circuit terminals listed below and ground:
    • Vision Signal + signal circuit terminal 1
    • Vision Signal - signal circuit terminal 3
    • If 10 V or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the K157 Video Processing Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K157 Video Processing Control Module.
    • If less than 10 V 
  7. Ignition OFF.
  8. Test for infinite resistance between the signal circuit terminals listed below and ground:
    • Vision Signal + signal circuit terminal 1
    • Vision Signal - signal circuit terminal 3
    • If less than infinite resistance 
    1. Disconnect the X1 harness connector at the K157 Video Processing Control Module.
    2. Test for infinite between the signal circuit and ground.
      • If less than infinite resistance, repair the short to voltage on the circuit.
      • If infinite resistance, replace the K157 Video Processing Control Module.
    • If infinite resistance 
  9. Test for less than 2 Ω between the video signal circuit terminals listed below:
    • B174G Frontview Camera - Grille video signal (+) circuit terminal 1 and the K157 Video Processing Control Module video signal (+) circuit terminal 1 X1
    • B174G Frontview Camera - Grille video signal (-) circuit terminal 3 and the K157 Video Processing Control Module video signal (-) circuit terminal 11 X1
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  10. Ignition OFF, connect the harness connector at the B174G Frontview Camera - Grille.
  11. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  12. Verify DTC B390F is not set.
    • If DTC B390F is set 

      Replace the B174G Frontview Camera - Grille.

    • If DTC B390F is not set 
  13. All OK.
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