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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 ((Totally Integrated Power Module (TIPM) - Electrical Diagnostics)) >> DTC Troubleshooting >> C1008-Brake Fluid Level Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
  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 

      • Go To  2

      No 

      • 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 STANDARD PROCEDURE .
  2. CHECK THE (B20) BRAKE FLUID LEVEL SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Measuring Voltage Between Ground & Brake Fluid Level Signal circuit
    GC0106244Courtesy of CHRYSLER GROUP, LLC
    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 STANDARD PROCEDURE .

      No 

      • Go To  3
  3. CHECK THE (B20) BRAKE FLUID LEVEL SIGNAL CIRCUIT FOR AN OPEN 
    Fig 2: Measuring Resistance Of Brake Fluid Level Signal Circuit
    GC0131839Courtesy of CHRYSLER GROUP, LLC
    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 

      • Go To  4

      No 

      • Repair the open in the (B20) Brake Fluid Level Signal circuit.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. CHECK THE (K91) SENSOR GROUND CIRCUIT FOR AN OPEN 
    Fig 3: Measuring Resistance Of Sensor Ground Circuit
    GC0127653Courtesy of CHRYSLER GROUP, LLC
    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 

      • Go To  5

      No 

      • Repair the open in the (K91) Sensor Ground circuit.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  5. BRAKE FLUID LEVEL SWITCH INTERNAL FAILURE 
    Fig 4: Checking Brake Fluid Level Switch For An Internal Failure
    GC0106245Courtesy of CHRYSLER GROUP, LLC
    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 STANDARD PROCEDURE .

      No 

      • Replace the TIPM in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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