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.

VERIFY THE DTC IS ACTIVE
NOTE:
If any other DTCs are present, repair them first before continuing with this diagnostic procedure.
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 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 and repair as necessary. If no problems are found, test complete.
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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 harness and connector.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
(G63) EPB INDICATOR 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 (G63) EPB Indicator Signal circuit at the Left Front Wheel Speed Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (G63) EPB Indicator Signal circuit for a short to voltage.
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
(G63) EPB INDICATOR SIGNAL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Measure the resistance between the (G63) EPB Indicator Signal circuit and ground.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (G63) EPB Indicator Signal circuit for a short to ground.
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
(G63) EPB INDICATOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (G63) EPB Indicator Signal circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.
  Is the resistance below 5 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (G63) EPB Indicator Signal circuit for an open or high resistance.
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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
  - Replace the Electric Parking Brake (EPB) Module in accordance with Service Information. Refer to MODULE, ELECTRIC PARK BRAKE (EPBM), REMOVAL .
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.