Circuit/System Testing

Head-Up Display = Inoperative

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: X4 @ P16 Instrument Cluster
3. Disconnect the electrical connector: X1 @ P29 Head-Up Display
4. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
5. Ignition - On / Vehicle - In Service Mode
6. Test for less than 1 V between the test points: Serial Data circuit terminal 20 @ P16 Instrument Cluster Component harness & Ground
   • If 1 V or greater 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
7. Ignition/Vehicle & All vehicle systems - Off
8. Test for infinite resistance between the test points: Serial Data circuit terminal 20 @ P16 Instrument Cluster Component harness & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
9. Replace the component: Low-Voltage Differential Signaling Cable @ P29 Head-Up Display & P16 Instrument Cluster
10. Connect the component: P16 Instrument Cluster & P29 Head-Up Display & S70R Steering Wheel Controls Switch - Right
11. Ignition - On / Vehicle - In Service Mode
12. Perform the scan tool function: Head-Up Display Pattern Check
13. Verify the component activates: P29 Head-Up Display
    • If the specified state 

      All OK.

    • Go to next step: If not the specified state 
14. Disconnect the electrical connector: S70R Steering Wheel Controls Switch - Right
15. Ignition - On / Vehicle - In Service Mode
16. Perform the scan tool function: Head-Up Display Pattern Check
17. Verify the component activates: P29 Head-Up Display
    • If the specified state 

      Replace the component: S70R Steering Wheel Controls Switch - Right

    • Go to next step: If not the specified state 
18. Disconnect the electrical connector: P29 Head-Up Display
19. Connect the component: S70R Steering Wheel Controls Switch - Right
20. Ignition - On / Vehicle - In Service Mode
21. Verify the function: Steering Wheel Controls
    • If the specified state 

      Replace the component: P29 Head-Up Display

    • Go to next step: If not the specified state 
22. Replace the component: P16 Instrument Cluster

Inoperative Head-Up Display Switch

1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S27 Head-Up Display Switch. 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 3 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display.
   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 P29 Head-Up Display.
   • Go to next step: If less than 10 Ω 
3. Test for 4.8 - 5.2 V between the signal circuit terminal 4 and ground.
   • If less than 4.8 V 
   1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display.
   2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P29 Head-Up Display.
   • If greater than 5.2 V 
   1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display, 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 P29 Head-Up Display.
   • Go to next step: If between 4.8 - 5.2 V 
4. Test or replace the S27 Head-Up Display Switch.