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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the connector at the B20AA Brake Fluid Level Indicator Switch 1. It may take up to 2 min for all vehicle systems to power down
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K160 Brake System Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K160 Brake System Control Module.
    • Go to next step: If less than 10 Ω 
  3. Connect the harness connector at the K160 Brake System Control Module. Verify the scan tool Brake Fluid Level Switch parameter is less than 4.3 V
    • Go to next step: If the parameter is greater than 4.3 V 
  4. Connect a 3 A fused jumper wire between signal terminal 1 and ground terminal 2.
  5. Verify the scan tool Brake Fluid Level Switch parameter is less than 1 V.
    • If the parameter is 1 V or greater 
    1. Test circuit 333 for a short to voltage.
      • If an short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is found is not found
    2. Test circuit 333 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If a open/high resistance is not found
    3. Replace the K160 Brake System Control Module.
    • Go to next step: If the parameter is less than 1 V 
  6. Replace the B20AA Brake Fluid Level Indicator Switch 1.
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