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Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Verify that the Stop Lamp Switch is installed correctly on the vehicle before proceeding.

    1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
    2. Record the Environmental Data and any DTCs.
    3. With the scan tool, erase DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read BCM DTCs.

      Did the DTC return?

      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 BODY VERIFICATION TEST .
  2. CHECK FOR ADDITIONAL DTCS 
    1. With the scan tool, read DTCs from all modules.

      Does the scan tool display any Stop Lamp Switch related DTCs as active?

      Yes 

      • Perform the Stop Lamp Switch related diagnostic test(s) before proceeding with this test.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE STOP LAMP BRAKE SIGNAL 1 FOR PROPER OPERATION 
    NOTE:

    The (B135) Brake Signal 1 circuit is normally OPEN when the brake pedal is NOT PRESSED.

    1. Make sure the ignition is on.
    2. With the Brake Pedal PRESSED, back-probe at the Stop Lamp Switch harness connector and measure the voltage on the (B135) Brake Signal 1 circuit.

      Is there any voltage present?

      Yes 

      • Go To  4

      No 

  4. CHECK THE STOP LAMP BRAKE SIGNAL 2 FOR PROPER OPERATION 
    NOTE:

    The (B134) Brake Signal 2 circuit is normally CLOSED when the brake pedal is NOT PRESSED.

    1. With the Brake Pedal NOT PRESSED, back-probe at the Stop Lamp Switch harness connector and measure the voltage on the (B135) Brake Signal 1 circuit.

      Is there any voltage present?

      Yes 

      • Go To  5

      No 

  5. CHECK THE (B135) BRAKE SIGNAL 1 CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the Stop Lamp Switch harness connector.
    3. Disconnect the BCM C4 harness connector.
    4. Check for continuity between ground and the (B135) Brake Signal 1 circuit at the Stop Lamp Switch harness connector.

      Is there continuity between ground and the (B135) Brake Signal 1 circuit?

      Yes 

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

      No 

      • Go To  6
  6. CHECK THE (B134) BRAKE SIGNAL 2 CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (B134) Brake Signal 2 circuit at the Stop Lamp Switch harness connector.

      Is there continuity between ground and the (B134) Brake Signal 2 circuit?

      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  7
  7. CHECK THE (B135) BRAKE SIGNAL 1 CIRCUIT FOR AN OPEN 
    1. Measure the resistance of the (B135) Brake Signal 1 circuit between the Stop Lamp Switch harness connector and the BCM C4 harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the (B135) Brake Signal 1 circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK THE (B134) BRAKE SIGNAL 2 CIRCUIT FOR AN OPEN 
    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 above 3.0 Ohms?

      Yes 

      • Repair the (B134) Brake Signal 2 circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  9
  9. CHECK RELATED BCM HARNESS CONNECTIONS 
    1. Disconnect all BCM harness connectors.
    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.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are 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 all 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.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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