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Home >> Chevrolet >> 2020 >> Trax LS, FWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> Brake Warning Indicator Malfunction (Chevrolet) >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before Circuit/System Testing.

Brake Fluid Level Sensor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B20 Brake Fluid Level Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • 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.
    • Go to next step: If less than 10 Ω 
  3. Disconnect the harness connector at the K9 Body Control Module.
  4. Test for infinite resistance between the signal circuit terminal 1 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • Go to next step: If infinite resistance
    1. Test for less than 2 Ω in the signal circuit end to end
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the B20 Brake Fluid Level Switch.
  5. Verify the Brake Warning Indicator is Off
    • If the Brake Warning Indicator is On 

      Replace the K9 Body Control Module

    • Go to next step: If the Brake Warning Indicator is Off 
  6. All OK.

Park Brake Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the B80 Park Brake Switch.
  2. Verify that the B80 Park Brake Switch has no physical damage or incorrect installation.
    • If physical damage or incorrect installation is found 

      Test or replace the B80 Park Brake Switch.

    • Go to next step: If the inspection is OK 
  3. Ignition ON.
  4. Verify the scan tool Park Brake Switch parameter is Released.
    • If the parameter is Applied 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If the parameter is Released 
  5. Install a 3 A fused jumper wire between the signal circuit terminal A and ground.
  6. Verify the scan tool Park Brake Switch parameter is Applied.
    • If the parameter is Released 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V.
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If the parameter is Applied 
  7. Test or replace the B80 Park Brake Switch.
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