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Home >> Jeep >> 2022 >> Compass Latitude Lux >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Antilock Brake System (Abs) (Continental) - DTCS C0020-01 To C0044-01 >> DTC Troubleshooting >> C0040-2A-Brake Pedal Switch - Stuck >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Check with customer for unusual driving terrain (e.g. mud, snow, ice) or aggressive driving maneuvers at the time of set condition.

    NOTE:

    This DTC must be active for the results of this test to be valid.

    1. Perform any Service Bulletins that may apply.
    2. Turn the ignition on.
    3. With the scan tool, read DTCs and record on the repair order.
    4. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
    5. With the scan tool, erase ABS DTCs.
    6. Cycle the ignition switch from off to on.
    7. With the scan tool, read ABS DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

      • The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
      • Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION .
  2. CHECK BODY CONTROL MODULE (BCM) DTCs 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs in the BCM.

      Are there any BCM Stop Lamp Switch related DTCs present?

      Yes 

      No 

      • Go To  3
  3. STOP LAMP SWITCH OPERATION 
    1. Start the engine.
    2. Using the scan tool, monitor the brake pedal switch status while pressing the brake pedal and releasing.

      Is the Stop Lamp Switch operating correctly?

      Yes 

      • Go To  4

      No 

      • Go To  5
  4. BRAKE PEDAL PRESSURE 
    1. Using the scan tool, monitor the brake pedal pressure and the status of the brake pedal switch while slowly pressing the brake pedal.

      Was there Brake Pressure before the Brake Pedal Switch status changed?

      Yes 

      No 

      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to .
  5. (B134) BRAKE SIGNAL 2 CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Stop Lamp Switch harness connector.
    3. Using a 12-volt test light connected to 12 volts, check the (B134) Brake Signal 2 circuit at the Stop Lamp Switch harness connector while pressing and releasing the brake pedal several times.

      Does the test light change from illuminated to not illuminated as the brake pedal is pressed and released?

      Yes 

      • Go To  6

      No 

      • Go To  7
  6. (B135) BRAKE SIGNAL 1 CIRCUIT 
    1. Turn the ignition on.
    2. Using a 12-volt test light connected to ground, check the (B135) Brake Signal 1 circuit at the Stop Lamp Switch harness connector while pressing and releasing the brake pedal several times.

      Does the test light change from illuminated to not illuminated as the brake pedal is pressed and released?

      Yes 

      • Go To  11

      No 

      • Go To  9
  7. (B134) BRAKE SIGNAL 2 CIRCUIT SHORTED TO GROUND 
    1. Disconnect the BCM C4 harness connector.
    2. Measure the resistance between ground and the (B134) Brake Signal 2 circuit in the Stop Lamp Switch harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      • Repair the (B134) Brake Signal 2 circuit for a short to ground.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  8
  8. (B134) BRAKE SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B134) Brake Signal 2 circuit between the Stop Lamp Switch harness connector and the BCM C4 harness connector.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go To  10

      No 

      • Repair the (B134) Brake Signal 2 circuit for an open or high resistance.
      • Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  9. (B135) BRAKE SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage of the (B135) Brake Signal 1 circuit in the Stop Lamp Switch harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (B135) Brake Signal 1 circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  10
  10. STOP LAMP SWITCH 
    1. Using the appropriate SYSTEM WIRING DIAGRAM/schematic as a guide, inspect the wiring and connectors between the Stop Lamp Switch and the Body Control Module (BCM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Replace the Stop Lamp Switch in accordance with the Service Information. Refer to SWITCH, STOP LAMP, REMOVAL AND INSTALLATION . Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
    5. Cycle the ignition switch from off to on.
      WARNING:

      To avoid possible serious or fatal injury, check brake capability is available before road testing.

    6. Test drive the vehicle above 40 km/h (25 mph).
      NOTE:

      Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet.

    7. With the scan tool, read DTCs in the ABS Module.

      Does the DTC remain active?

      Yes 

      • Go To  11

      No 

  11. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect the ABS Module harness connector.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect the ABS Module harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
      WARNING:

      To avoid possible serious or fatal injury, check brake capability is available before road testing.

    9. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    10. With the scan tool, read ABS Module DTCs.

      Did the DTC return?

      Yes 

      No 

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