C1008-BRAKE FLUID LEVEL CIRCUIT HIGH

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
With the ignition on.
Set Condition:
When the Totally Integrated Power Module (TIPM) detects the Brake Fluid Level Circuit voltage is greater than expected for more than five seconds.

Possible Causes
(B20) BRAKE FLUID LEVEL SIGNAL CIRCUIT OPEN
(B20) BRAKE FLUID LEVEL SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
BRAKE FLUID LEVEL SWITCH INTERNAL FAILURE
(K91) SENSOR GROUND CIRCUIT OPEN
TOTALLY INTEGRATED POWER MODULE (TIPM)

1. CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)

1.	Turn the ignition on.

2.	Using the scan tool, read the TIPM DTCs.

Does the scan tool display this DTC as active?

Yes

Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

2. CHECK THE (B20) BRAKE FLUID LEVEL SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

1.	Turn the ignition off.

2.	Disconnect the Brake Fluid Level Switch harness connector.

3.	Disconnect the TIPM C7 harness connector.

4.	Turn the ignition on.

5.	Measure the voltage between ground and the (B20) Brake Fluid Level Signal circuit.

Is there any voltage present?

Yes

Repair the short to voltage in the (B20) Brake Fluid Level Signal circuit.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

3. CHECK THE (B20) BRAKE FLUID LEVEL SIGNAL CIRCUIT FOR AN OPEN

1.	Turn the ignition off.

2.	Measure the resistance of the (B20) Brake Fluid Level Signal circuit between the Brake Fluid Level Sensor harness connector and the TIPM C7 harness connector.

Is the resistance below 5.0 Ohms?

Yes

Repair the open in the (B20) Brake Fluid Level Signal circuit.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

4. CHECK THE (K91) SENSOR GROUND CIRCUIT FOR AN OPEN

1.	Measure the resistance of the (K91) Sensor Ground circuit between the Brake Fluid Level Sensor harness connector and the TIPM C7 harness connector.

Is the resistance below 5.0 Ohms?

Yes

5. BRAKE FLUID LEVEL SWITCH INTERNAL FAILURE

1.	Reconnect the TIPM C7 harness connector.

2.	Connect a jumper wire between the (B20) Brake Fluid Level Signal circuit and the (K91) Sensor Ground circuit in the Brake Fluid Level Sensor harness connector.

3.	Turn the ignition on.

4.	Using the scan tool, read the Brake Fluid Level voltage

Is the voltage below 1.0 Volt?

Yes

Replace the Brake Fluid Level Sensor in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Replace the TIPM in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).