DTC C004B
Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC C004B Brake Fluid Level Sensor Signal For symptom byte information, refer to Symptom Byte List. Diagnostic Fault Information
| Circuit | Circuit Function | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performan |
|---|---|---|---|---|---|
| 333 | Signal | C0049 00 | C004B 15 | C004B 15 | — |
| 1151 | Ground | — | C004B 15 | — | — |
Scan Tool Data Brake Fluid Level Switch
| Control Module | Data List | Values | Normal Operation |
|---|---|---|---|
| K160 Brake System Control Module | Hydraulic Brakes Data | V | The parameter will display low voltage with low brake fluid |
Circuit/System Description The B20A Brake Fluid Level Indicator Switch is a normally open switch that closes when the brake fluid is below the minimum level. The switch is magnetically actuated by a float. The K160 Brake System Control Module monitors the switch on signal circuit 333 and the switch receives a constant ground on ground circuit 1151. Conditions for Running the DTC Ignition/Vehicle ON Conditions for Setting the DTC DTC C004B 15 Circuit 333 is open or shorted voltage Circuit 1151 is open Action Taken When the DTC Sets Traction/Stability Control Indicator is on A message and/or warning indicator may be displayed to the driver. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. Reference Information Schematic Reference Antilock Brake System Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification
- Ignition/Vehicle Off
- Verify the brake fluid level is not low. ⇒ If the fluid is low Repair as necessary ⇓ If the fluid is not low
- Refer to Circuit/System Testing. Circuit/System Testing
- Ignition OFF, disconnect the connector at the B20A Brake Fluid Level Indicator Switch.
- Verify a test lamp illuminates between ground terminal 2 and B+ ⇒ If the test lamp does not illuminate Repair the open/high resistance on circuit 1151 or the ground connection. ⇓ If the test lamp illuminates
- Verify the scan tool Brake Fluid Level Switch parameter is greater than 10 V ⇒ If the parameter is less than 10 V 3.1. Test circuit 333 for a short to ground. ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found 3.2. Replace the K160 Brake System Control Module. ⇓ If the parameter is greater than 10 V
- Connect a 3 A fused jumper wire between signal terminal 1 and ground terminal 2.
- Verify the scan tool Brake Fluid Level Switch parameter is less than 1 V. ⇒ If the parameter is 1 V or greater 5.1. Test circuit 333 for a short to voltage. ⇒ If an short to voltage is found, repair the fault on the circuit. ⇓ If a short to voltage is found is not found 5.2. Test circuit 333 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If a open/high resistance is not found 5.3. Replace the K160 Brake System Control Module. ⇓ If the parameter is less than 1 V
- Replace the B20A Brake Fluid Level Indicator Switch. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for control module replacement, programming, and setup.