Component Testing

Ignition OFF/Vehicle OFF, disconnect the harness connector at the S27 Head-Up Display Switch.
Test for 3.7K - 3.9K Ω between the signal terminal 4 and the low reference terminal 3.
- If not between 3.7K - 3.9K Ω
  Replace the S27 Head-Up Display Switch.
- Go to next step: If between 3.7K - 3.9K Ω
Test for 1K - 1.2K Ω between the signal terminal 4 and the low reference terminal 3 with the HUD DOWN Switch pressed.
- If not between 1K - 1.2K Ω
  Replace the S27 Head-Up Display switch.
- Go to next step: If between 1K - 1.2K Ω
Test for 0.55K - 0.75K Ω between the signal terminal 4 and the low reference terminal 3 with the HUD UP Switch pressed.
- If not between 0.55K - 0.75K Ω
  Replace the S27 Head-Up Display switch.
- Go to next step: If between 0.55K - 0.75K Ω
Test for 1.8K - 2.0K Ω between the signal terminal 4 and the low reference terminal 3 with the INFO/PAGE Switch pressed.
- If not between 1.8K - 2.0K Ω
  Replace the S27 Head-Up Display Switch.
- Go to next step: If between 1.8K - 2.0K Ω
Test for 95 - 115 Ω between the signal terminal 4 and the low reference terminal 3 with the Brightness + Switch pressed.
- If not between 1.3K - 1.6K Ω
  Replace the S27 Head-Up Display Switch.
- Go to next step: If between 1.3K - 1.6K Ω
Test for 310 - 350 Ω between the signal terminal 4 and the low reference terminal 3 with the Brightness - Switch pressed.
- If not between 310 - 350 Ω
  Replace the S27 Head-Up Display Switch.
- Go to next step: If between 310 - 350 Ω
All OK.