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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC B124B (IOS/IOT/IOU) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

USB Ports (Inside Center Console)

  1. Ignition OFF, disconnect the X1 harness connector at the X92 USB Receptacle.
  2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • Go to next step: If the test lamp illuminates 
  4. Verify the USB cable is properly connected at all components and in-line connections, and there is no damage to the cable or connections.
    • If connection problems or cable damage is noted. 

      Perform the appropriate repair or replacement to correct any issues.

    • Go to next step: If no connection problems or cable damage is noted. 
  5. Replace the X92 USB Receptacle. Connect all harness connectors.
  6. Ignition ON, infotainment system ON.
  7. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X92 USB Receptacle USB port and select the USB test mode.
  8. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
    • If audio is not heard from the test tool 
    1. Replace the USB cable assembly between the X92 USB receptacle and the A11 Radio. Connect all harness connectors.
    2. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X92 USB Receptacle USB port and select the USB test mode.
    3. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
      • If audio is not heard from the test tool, replace the A11 Radio.
      • If audio is heard from the test tool.
    4. All OK.
    • Go to next step: If audio is heard from the test tool 
  9. All OK.

Auxiliary Audio Input Jack, USB Port and SD Card Reader (Front Floor Console)

  1. Ignition OFF, disconnect the X1 harness connector at the X83 Auxiliary Audio Input.
  2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • Go to next step: If the test lamp illuminates 
  4. Verify the USB cable is properly connected at all components and in-line connections, and there is no damage to the cable or connections.
    • If connection problems or cable damage is noted. 

      Perform the appropriate repair or replacement to correct any issues.

    • Go to next step: If no connection problems or cable damage is noted. 
  5. Connect the X1 harness connector at the X83 Auxiliary Audio Input.
  6. Disconnect the vehicle USB cable X3 harness connector at the X92 USB Receptacle and the X83 Auxiliary Audio Input.
  7. Connect the EL-50334-14 Infotainment Test Cable and the EL-50334-2 Type-A Female to Mini-B Male Cable together. Connect the assembled test cable to the X92 USB Receptacle and the X83 Auxiliary Audio Input.
  8. Ignition ON, infotainment system ON.
  9. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the following one at a time.
    • X83 Auxiliary Audio Input Auxiliary Jack and select Test Mode
    • X83 Auxiliary Audio Input USB port and select Test Mode
  10. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system on both auxiliary jack and USB port while operating the system to play audio from the test tool.
    • If audio is not heard from the test tool from one or both 
    1. Replace the X83 Auxiliary Audio Input. Connect all harness connectors.
    2. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the following one at a time.
      • X83 Auxiliary Audio Input Auxiliary Jack and select Test Mode
      • X83 Auxiliary Audio Input USB port and select Test Mode
    3. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system on both the auxiliary jack and USB port while operating the system to play audio from the test tool.
      • If audio is not heard from the test tool from one or both, replace the X92 USB Receptacle.
      • If audio is heard from the test tool.
    4. All OK.
    • Go to next step: If audio is heard from the test tool 
  11. Connect the vehicle USB cable X3 harness connector at the X92 USB Receptacle.
  12. Disconnect the console to I/P USB in-line connector. Connect the assembled test cable to the I/P side of the in-line USB cable connector and the X83 Auxiliary Audio Input.
  13. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X83 Auxiliary Audio Input USB port and select the USB test mode.
  14. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
    • If audio is not heard from the test tool 

      Replace the I/P USB cable assembly.

    • Go to next step: If audio is heard from the test tool 
  15. Replace the console USB cable assembly.
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