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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (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 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block-Underhood, ignition ON.
  2. Verify the P12 Horn is not activated.
    • If the P12 Horn is activated 
    1. Ignition OFF, disconnect the harness connector at the P12 Horn, ignition ON.
    2. Test for less than 1 V between the control circuit terminal 2 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the P12 Horn.
    • If the P12 Horn is not activated 
  3. Connect a 15A fused jumper wire between the control circuit terminal D4 and B+.
  4. Verify the P12 Horn activates.
    • If the P12 Horn does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the P12 Horn, ignition ON.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    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 P12 Horn.
    • If the P12 Horn activates 
  5. Ignition OFF, connect the X1 harness connector at the X50A Fuse Block-Underhood. Disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  6. Verify the P12 Horn is not activated.
    • If the P12 Horn is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
    2. Test for infinite resistance between the control circuit terminal 19 X5 at the K9 Body Control Module 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 P12 Horn is not activated 
  7. Connect a 3 A fused jumper wire between the control circuit terminal 19 and ground.
  8. Verify the P12 Horn activates.
    • If the P12 Horn 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 control circuit terminal 19 X5 at the K9 Body Control Module 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 P12 Horn activates 
  9. Replace the K9 Body Control Module.
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