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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 132 (Horn System) >> Diagnostic Information and Procedures >> DTC B2750: Horn Relay >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify the P13 Horn Assembly is not activated.
    • If the P13 Horn Assembly is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
    2. Test for infinite resistance between the K9 Body Control Module control circuit terminal 19 X5 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the X50A Fuse Block-Underhood.
    • If the P13 Horn Assembly is not activated 
  3. Connect a 3 A fused jumper wire between the control circuit terminal 19 and ground.
  4. Verify the P13 Horn Assembly activates.
    • If the P13 Horn Assembly does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block-Underhood, ignition ON.
    2. Test for less than 1 V between the K9 Body Control Module control circuit terminal 19 X5 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 control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the X50A Fuse Block-Underhood.
    • If the P13 Horn Assembly activates 
  5. Replace the K9 Body Control Module.
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