Component Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the harness connector at the S27 Head-Up Display Switch.
Test for 3.4K - 4.2K Ω between the signal terminal 4 and the low reference terminal 3.
- If not between 3.4K - 4.2K Ω
  Replace the S27 Head-Up Display Switch.
- If between 3.4K - 4.2K Ω
Test for 87 - 107 Ω between the signal terminal 4 and the low reference terminal 3 with the Dim + switch pressed.
- If not between 87 - 107 Ω
  Replace the S27 Head-Up Display Switch.
- If between 87 - 107 Ω
Test for 291 - 356 Ω between the signal terminal 4 and the low reference terminal 3 with the Dim - switch pressed.
- If not between 291 - 356 Ω
  Replace the S27 Head-Up Display Switch.
- If between 291 - 356 Ω
Test for 575 - 704 Ω between the signal terminal 4 and the low reference terminal 3 with the Up switch pressed.
- If not between 575 - 704 Ω
  Replace the S27 Head-Up Display Switch.
- If between 575 - 704 Ω
Test for 1K - 1.2K Ω between the signal terminal 4 and the low reference terminal 3 with the Down switch pressed.
- If not between 1K - 1.2K Ω
  Replace the S27 Head-Up Display Switch.
- If between 1K - 1.2K Ω
Test for 1.7K - 2.1K Ω between the signal terminal 4 and the low reference terminal 3 with the Page switch pressed.
- If not between 1.7K - 2.1K Ω
  Replace the S27 Head-Up Display Switch.
- If between 1.7K - 2.1K Ω
All OK.