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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 ((Electric Parking Brake (EPB) Module - Electrical Diagnostics)) >> DTC Troubleshooting >> C10CD-01-Electronic Park Brake Switch - General Electrical Failure >> Diagnostic Test

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. VERIFY THE DTC IS ACTIVE 
    1. Perform any Service Bulletins that may apply.
    2. Turn the ignition on.
    3. With the scan tool, record and erase the DTCs.
    4. Cycle the ignition from off to on.
    5. Press and hold the brake pedal.
    6. Push the EPB Switch down to release the Electric Parking Brakes.
    7. Pull the EPB Switch up to set the Electric Parking Brakes.
    8. Push the EPB Switch down to release the Electric Parking Brakes.
    9. Release the brake pedal.
    10. Cycle the ignition from off to on.
    11. With the scan tool, read EPB DTCs.

      Is the DTC active at this time?

      Yes 

      • Go To  2

      No 

      • The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring harness and electrical connectors.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  2. CHECK PARKING BRAKE SWITCH CONNECTOR/TERMINAL FOR DAMAGE 
    NOTE:

    Check all terminals for broken, bent, pushed out, or corroded terminals.

    1. Turn the ignition off.
    2. Inspect the Parking Brake Switch for proper mounting.
    3. Inspect the Parking Brake Switch for correct mechanical operation.
    4. Inspect the Parking Brake Switch harness and connector.

      Were any problems found?

      Yes 

      No 

      • Go To  3
  3. (B60) EPB SWITCH POSITION 1 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Disconnect the EPB Module harness connector.
    2. Disconnect the Parking Brake Switch harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (B60) EPB Switch Position 1 Signal circuit at the Parking Brake Switch harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (B60) EPB Switch Position 1 Signal circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  4
  4. (B67) EPB SWITCH POSITION 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage of the (B67) EPB Switch Position 2 Signal circuit at the Parking Brake Switch harness connector harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (B67) EPB Switch Position 2 Signal circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  5
  5. (B68) EPB SWITCH POSITION 3 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage of the (B68) EPB Switch Position 3 Signal circuit at the Parking Brake Switch harness connector harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (B68) EPB Switch Position 3 Signal circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  6
  6. (B69) EPB SWITCH POSITION 4 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage of the (B69) EPB Switch Position 4 Signal circuit at the Parking Brake Switch harness connector harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (B69) EPB Switch Position 4 Signal circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  7
  7. (B70) EPB SWITCH POSITION 5 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage of the (B70) EPB Switch Position 5 Signal circuit at the Parking Brake Switch harness connector harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (B70) EPB Switch Position 5 Signal circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  8
  8. (B71) EPB SWITCH POSITION 6 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage of the (B71) EPB Switch Position 6 Signal circuit at the Parking Brake Switch harness connector harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (B71) EPB Switch Position 6 Signal circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  9
  9. (B60) EPB SWITCH POSITION 1 SIGNAL CIRCUIT SHORTED TO GROUND 
    1. Turn the ignition off.
    2. Check for continuity between ground and the (B60) EPB Switch Position 1 Signal circuit at the Parking Brake Switch harness connector.

      Is there continuity between ground and the (B60) EPB Switch Position 1 Signal circuit?

      Yes 

      • Repair the (B60) EPB Switch Position 1 Signal circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  10
  10. (B67) EPB SWITCH POSITION 2 SIGNAL CIRCUIT SHORTED TO GROUND 
    1. Check for continuity between ground and the (B67) EPB Switch Position 2 Signal circuit at the Parking Brake Switch harness connector.

    2. Is there continuity between ground and the (B67) EPB Switch Position 2 Signal circuit?

      Yes 

      • Repair the (B67) EPB Switch Position 2 Signal circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  11
  11. (B68) EPB SWITCH POSITION 3 SIGNAL CIRCUIT SHORTED TO GROUND 
    1. Check for continuity between ground and the (B68) EPB Switch Position 3 Signal circuit at the Parking Brake Switch harness connector.

      Is there continuity between ground and the (B68) EPB Switch Position 3 Signal circuit?

      Yes 

      • Repair the (B68) EPB Switch Position 3 Signal circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  12
  12. (B69) EPB SWITCH POSITION 4 SIGNAL CIRCUIT SHORTED TO GROUND 
    1. Check for continuity between ground and the (B69) EPB Switch Position 4 Signal circuit at the Parking Brake Switch harness connector.

      Is there continuity between ground and the (B69) EPB Switch Position 4 Signal circuit?

      Yes 

      • Repair the (B69) EPB Switch Position 4 Signal circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  13
  13. (B70) EPB SWITCH POSITION 5 SIGNAL CIRCUIT SHORTED TO GROUND 
    1. Check for continuity between ground and the (B70) EPB Switch Position 5 Signal circuit at the Parking Brake Switch harness connector.

      Is there continuity between ground and the (B70) EPB Switch Position 5 Signal circuit?

      Yes 

      • Repair the (B70) EPB Switch Position 5 Signal circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  14
  14. (B71) EPB SWITCH POSITION 6 SIGNAL CIRCUIT SHORTED TO GROUND 
    1. Check for continuity between ground and the (B71) EPB Switch Position 6 Signal circuit at the Parking Brake Switch harness connector.

      Is there continuity between ground and the (B71) EPB Switch Position 6 Signal circuit?

      Yes 

      • Repair the (B71) EPB Switch Position 6 Signal circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  15
  15. (B60) EPB SWITCH POSITION 1 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B60) EPB Switch Position 1 Signal circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  16

      No 

      • Repair the (B60) EPB Switch Position 1 Signal circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  16. (B67) EPB SWITCH POSITION 2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B67) EPB Switch Position 2 Signal circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  17

      No 

      • Repair the (B67) EPB Switch Position 2 Signal circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  17. (B68) EPB SWITCH POSITION 3 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B68) EPB Switch Position 3 Signal circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  18

      No 

      • Repair the (B68) EPB Switch Position 3 Signal circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  18. (B69) EPB SWITCH POSITION 4 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B69) EPB Switch Position 4 Signal circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  19

      No 

      • Repair the (B69) EPB Switch Position 4 Signal circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  19. (B70) EPB SWITCH POSITION 5 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B70) EPB Switch Position 5 Signal circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  20

      No 

      • Repair the (B70) EPB Switch Position 5 Signal circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  20. (B71) EPB SWITCH POSITION 6 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B71) EPB Switch Position 6 Signal circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  21

      No 

      • Repair the (B71) EPB Switch Position 6 Signal circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  21. PARKING BRAKE SWITCH 
    1. Replace the Parking Brake Switch in accordance with the Service Information. Refer to SWITCH, ELECTRIC PARK BRAKE, REMOVAL .
    2. Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
    3. Turn the ignition on.
    4. With the scan tool, record and erase the DTCs.
    5. Cycle the ignition from off to on.
    6. Press and hold the brake pedal.
    7. Push the EPB Switch down to release the Electric Parking Brakes.
    8. Pull the EPB Switch up to set the Electric Parking Brakes.
    9. Push the EPB Switch down to release the Electric Parking Brakes.
    10. Release the brake pedal.
    11. Cycle the ignition from off to on.
    12. With the scan tool, read EPB DTCs.

      Does the DTC remain active?

      Yes 

      No 

      • Test complete.
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