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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Horn System) >> Diagnostic Information and Procedures >> Horns Malfunction >> Circuit/System Testing >> Test 1

Test 1

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  1. Ignition/Vehicle & All vehicle systems - Off
    NOTE: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  2. Disconnect the electrical connector: S33 Horn Switch
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 2 & Ground
    • If 10 Ω or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 2 @ Component harness & Ground Connection
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter: Horn Switch=Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X3 @ K9 Body Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
    • If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 2
  7. Verify the scan tool parameter: Horn Switch=Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X3 @ K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 1 @ Component harness & Terminal 18 X3 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K9 Body Control Module
    • If the specified state 
  8. Test or replace the component: S33 Horn Switch
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