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Diagnostic Fault Information

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ - Relay Coil 2.4 2.4 - -
B+ - Relay Switch 2.4 2.4 - -
Signal - S33 Horn Switch 2.4 5 - -
Control - P12 Horn 2.4 2.4 1, 3 -
Control - Relay Coil B2750 02 B2750 04 B2750 01 -
Ground - S33 Horn Switch - 5 - -
Ground - P12L Horn - Left - 2 - -
Ground - P12R Horn - Right - 4 - -
  1. P12L Horn - Left=Always On
  2. P12L Horn - Left=Inoperative
  3. P12R Horn - Right=Always On
  4. P12R Horn - Right=Inoperative
  5. S33 Horn Switch=Inoperative
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