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Circuit/System Testing

Head-Up Display Inoperative

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the P29 Head-Up Display. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 30 Ω between the Head-Up Display ground circuit terminal 6 and ground.
    • If 30 Ω or greater 

      Test the ground circuit for an open/high resistance.

    • If less than 30 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is OK 
    1. Ignition OFF.
    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.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the P29 Head-Up Display
    • If the test lamp illuminates 
  5. Ignition OFF, reconnect the P29 Head-Up Display. Disconnect the S27 head-up display switch.
  6. Connect a 3A fused jumper wire between the signal circuit terminal 4 and ground.
  7. Verify the scan tool Dim Select Switch parameter displays Short.
    • If scan tool does not display Short 
    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
    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 scan tool displays Short 
  8. Connect the J 33431-C  Signal Generator and Tester or a similar variable resistance tool.
  9. Verify the scan tool Dim Select Switch parameter changes from 1 through 12 while changing resistance from 30-920Ω.
    • If scan tool parameter does not change properly 

      Replace the P29 Head-Up Display.

    • If scan tool parameter changes properly 
  10. Verify all pixels on Head-Up Display are turned On or Off while performing the scan tool Info Display Pattern 1 Check test.
    • If pixels do not turn On or Off properly 

      Replace the P29 Head-Up Display.

    • If all pixels turn On and Off properly 
  11. Test or replace the S27 Head-Up Display Switch.
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