Circuit/System Testing

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.
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
Ignition ON.
Verify the scan tool Brake Fluid Level Sensor parameter is Low.
- If the parameter is not Low
1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
2. 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.
  - If infinite resistance, replace the K17 Electronic Brake Control Module.
- Go to next step: If the parameter is Low
Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground.
Verify the scan tool Brake Fluid Level Sensor parameter is Ok.
- If the parameter is not Ok
1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake 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 K17 Electronic Brake Control Module.
- Go to next step: If the parameter is Ok
Test or replace the B20 Brake Fluid Level Switch.