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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF/Ignition OFF.
  2. Verify the LVDS interface cable is properly connected at the P17 Info Display Module X2 and the K74 Human Machine Interface Control Module X5 connections and there is no damage to the cable or connections.
  3. Ignition ON/Vehicle in Service Mode, infotainment system ON.
  4. Verify the P17 Info Display Module does not display an image.
    • If the P17 Info Display Module displays an image. 

      All OK.

    • Go to next step: If the P17 Info Display Module does not display an image. 
  5. Vehicle OFF/Ignition OFF.
  6. Disconnect the LVDS interface cable from the P17 Info Display Module X2.
  7. Connect the EL-50334-2 Type A female to Mini B male USB Cable to the P17 Info Display Module X2. Connect the EL-50334-14 Infotainment Test Cable to the adapter.
  8. Disconnect the LVDS interface cable from the K74 Human Machine Interface Control Module X5. Connect the EL-50334-14 Infotainment Test cable to the K74 Human Machine Interface Module X5.
  9. Ignition ON/Vehicle in Service Mode, infotainment system ON.
  10. Verify the P17 Info Display Module displays an image.
    • If the P17 Info Display Module does not display an image 
    1. Using the scan tool, access the HMI control functions and select Info Display Test.
    2. Verify the P17 Info Display Module displays an image.
      • If the P17 Info Display Module displays an image, replace the K74 Human Machine Interface Control Module.
      • Go to next step: If the P17 Info Display Module does not display an image
    3. Replace the P17 Info Display Module. Connect all harness connectors.
    4. Verify the P17 Info Display Module displays an image.
      • If the P17 Info Display Module does not display an image, replace the K74 Human Machine Interface Control Module.
      • Go to next step: If the P17 Info Display Module displays an image
    5. All OK
    • Go to next step: If the P17 Info Display Module displays an image. 
  11. Replace the vehicle LVDS interface cable from the P17 Info Display Module X2 to the K74 Human Machine Interface Module X5.
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