LEMON Manuals: Even more car manuals for everyone
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 >> Radio Information Display Malfunction (IOR) >> 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.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X1 @ P17 Info Display Module
  3. Ignition - On/Vehicle - In Service Mode - Infotainment System State - On
  4. Test for greater than 3 V between the test points: Signal circuit terminal 6 & Ground
    • If less than 3 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: X1 @ A11 Radio
    3. Test for infinite resistance between the test points: Signal circuit terminal 6 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 ohms between the test points: Signal circuit terminal 6 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: A11 Radio
    • Go to next step: If greater than 3 V 
  5. Test for battery voltage between the test points: 12 V Reference circuit terminal 1 & Ground
    • If less than battery voltage 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1 @ A11 Radio
    3. Test for infinite resistance between the test points: 12 V Reference circuit terminal 1 @ P17 Info Display Module Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 ohms between the test points: 12 V Reference circuit terminal 1 @ P17 Info Display Module Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: A11 Radio
    • Go to next step: If battery voltage 
  6. Adjust - Dimmer Switch - High
  7. Test for 3 to 3.5 V between the test points: Control circuit terminal 9 & Ground
    • If less than 3 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1 @ A11 Radio
    3. Test for infinite resistance between the test points: Control circuit terminal 9 @ P17 Info Display Module Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 ohms between the test points: Control circuit terminal 9 @ P17 Info Display Module Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: A11 Radio
    • If greater than 3.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1 @ A11 Radio
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 9 @ P17 Info Display Module Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: A11 Radio
    • Go to next step: If between 3 and 3.5 V 
  8. Connect all electrical connectors.
  9. Verify the following conditions do not exist:

    Damaged, defective, or loose component: Low-Voltage Differential Signaling Cable

  10. Disconnect the electrical connector: Low-Voltage Differential Signaling Cable @ P17 Info Display Module
  11. Connect - EL-50334-2 USB Type A Female to Type B Mini Male Adapter @ P17 Info Display Module & EL-50334-14 Infotainment Test Cable
  12. Disconnect the electrical connector: Low-Voltage Differential Signaling Cable @ A11 Radio
  13. Connect - EL-50334-14 Infotainment Test Cable @ A11 Radio
  14. Ignition - On/Vehicle - In Service Mode - Infotainment System State - ON
  15. Verify the component works as specified: P17 Info Display Module
    • If the component does not work as specified 
    1. Replace the component: P17 Info Display Module - Connect all electrical connectors.
    2. Ignition - On/Vehicle - In Service Mode - Infotainment System State - ON
    3. Verify the component works as specified: P17 Info Display Module
      • If the component does not work as specified

        Replace the component: A11 Radio

      • If the component works as specified
    4. All OK.
    • Go to next step: If the component works as specified 
  16. Replace the component: Low-Voltage Differential Signaling Cable
scientia non olet · About LEMON Manuals