Circuit/System Testing

Head-Up Display=Inoperative

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: X1 @ P16 Instrument Cluster
3. Disconnect the electrical connector: P29 Head-Up Display
4. Ignition - On / Vehicle - In Service Mode
5. Test for less than 1 V between the test points:Serial Data circuit terminal 21 @ 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 
6. Ignition/Vehicle & All vehicle systems - Off
7. Test for infinite resistance between the test points: Serial Data circuit terminal 21 @ 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
8. Disconnect the electrical connector:S70R Steering Wheel Controls Switch - Right
9. Ignition - On / Vehicle - In Service Mode
10. Test for less than 1 V between the test points:Serial Data circuit terminal 5 @ 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 
11. Ignition/Vehicle & All vehicle systems - Off
12. Test for infinite resistance between the test points: Serial Data circuit terminal 5 @ Component harness & Ground
    • If less than infinite resistance - Repair the short to ground on the circuit.
    • Go to next step: If infinite resistance
13. Replace the component:Low-Voltage Differential Signaling Cable@P29 Head-Up Display & P16 Instrument Cluster
14. Ignition/Vehicle & All vehicle systems - Off
15. Perform the scan tool function:Head-Up Display Pattern Check
16. Verify the component activates:P29 Head-Up Display
    • If the specified state 

      All OK.

    • Go to next step: If not the specified state 
17. Connect the component:P16 Instrument Cluster & S70R Steering Wheel Controls Switch - Right
18. Ignition - On / Vehicle - In Service Mode
19. 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 
20. Ignition/Vehicle & All vehicle systems - Off
21. Disconnect the electrical connector:S70R Steering Wheel Controls Switch - Right
22. Connect the component:P29 Head-Up Display
23. Ignition - On / Vehicle - In Service Mode
24. Verify the function:Head-Up Display Switch
    • If the specified state 

      Replace the component:S70R Steering Wheel Controls Switch - Right

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

Head-Up Display Switch=Inoperative

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: S27 Head-Up Display Switch
3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 3 & Ground
   • If 10 ohms or greater 
   1. Disconnect the electrical connector: P29 Head-Up Display
   2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 3 @ Component harness & The other end of the circuit
      • If ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: P29 Head-Up Display
   • Go to next step: If less than 10 ohms 
4. Test for 4.8 to 5.2V between the test points: Signal circuit terminal 4 & Ground
   • If less than 4.8 V 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: P29 Head-Up Display
   3. Test for infinite resistance between the test points: Signal circuit terminal 4 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   4. Test for less than 2 ohms between the test points: Signal circuit terminal 4 @ 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: P29 Head-Up Display
   • If greater than 5.2 V 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector:P16 Instrument Cluster
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal 4 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: P16 Instrument Cluster
   • Go to next step: If between 4.8 V 
5. Test or replace the component: S27 Head-Up Display Switch