Circuit/System Testing
- Ignition OFF, disconnect the S27 Head-Up Display Switch.
- Verify the scan tool Dim Select Switch parameter displays Open.
- If Dim Select Switch parameter does not display Open
- Ignition OFF, disconnect the harness connector at the Head-Up Display.
- Test for infinite resistance between the signal circuit terminal 3 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 Dim Select Switch parameter displays Open
- Test or replace the S27 Head-Up Display Switch.