Circuit/System Testing

Inoperative Head-Up Display

1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster and P29 Head-Up Display. Ignition ON.
2. Test for less than 1 V between the P16 Instrument Cluster harness connector X1 serial data circuit terminal 21 and ground.
   • If greater than 1 V 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
3. Ignition OFF.
4. Test for infinite resistance between the P16 Instrument Cluster harness connector X1 serial data circuit terminal 21 and ground.
   • If less than infinite resistance  repair the short to ground on the circuit.
   • Go to next step: If infinite resistance 
5. Disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right. Ignition ON.
6. Test for less than 1 V between the S70R Steering Wheel Controls Switch - Right serial data circuit terminal 5 and ground.
   • If greater than 1 V 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
7. Ignition OFF.
8. Test for infinite resistance between the serial data circuit terminal 5 and ground.
   • If less than infinite resistance 

     Repair the short to ground on the circuit.

   • Go to next step: If infinite resistance 
9. Replace the video cable between the P29 Head-Up Display and the P16 Instrument Cluster. Ignition ON.
10. Verify a test pattern is displayed is displayed on the P29 Head-Up Display when performing the Head-Up Display Pattern Check on the scan tool.
    • If the test pattern is displayed 

      All OK.

    • Go to next step: If the test pattern is not displayed 
11. Connect the harness connector at the P16 Instrument Cluster and S70R Steering Wheel Controls Switch - Right. Ignition ON.
12. Verify steering wheel controls function properly.
    • If steering wheel controls function properly 

      Replace P29 Head-Up Display.

    • Go to next step: If steering wheel controls do not function properly 
13. Ignition OFF. Disconnect harness connector at the S70R Steering Wheel Controls Switch - Right. Connect the harness connector at the and P29 Head-Up Display. Ignition ON.
14. Verify head-up display functions properly.
    • If head-up display functions properly 

      Replace S70R Steering Wheel Controls Switch - Right.

    • Go to next step: If head-up display does not function properly 
15. Replace P16 Instrument Cluster.

Inoperative Head-Up Display Switch

1. Ignition 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, 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. Ignition ON.
4. Test for 4.8 - 5.2 V between the signal circuit terminal 4 and ground.
   • If less than 4.8 V 
   1. Ignition 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, 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 
5. Test or replace the S27 Head-Up Display Switch.