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.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. Turn the Headlamps on.
3. With the scan tool, read 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 BODY VERIFICATION TEST .
CHECK THE (L43) LEFT LOW BEAM DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
1. Turn the Headlamps off.
2. Turn the ignition off.
3. Disconnect the Left Front Lamp Assembly C1 harness connector.
4. Disconnect the BCM C3 harness connector.
5. Turn the ignition on.
6. Measure the voltage between ground and the (L43) Left Low Beam Driver circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L43) Left Low Beam Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (L43) LEFT LOW BEAM DRIVER CIRCUIT FOR AN OPEN IN THE HARNESS
1. Turn the ignition off.
2. Measure the resistance of the (L43) Left Low Beam Driver circuit between the Left Front Lamp Assembly C1 harness connector and the BCM C3 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open in the (L43) Left Low Beam Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z915) GROUND CIRCUIT FOR AN OPEN IN THE HARNESS
1. Disconnect the Left Front Lamp Assembly C2 harness connector.
2. Using a 12-volt test light connected to 12-volts, check the (Z915) Ground circuit at the Left Front Lamp Assembly C1 and C2 harness connectors.
  Does the test light illuminate brightly for both circuits?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (Z915) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE BCM FOR CORRECT OPERATION
1. Reconnect the Left Front Lamp Assembly C2 harness connector.
2. Reconnect the BCM C3 harness connector.
3. Connect a 12-volt test light between the (L43) Left Low Beam Driver circuit and the (Z915) Ground circuit in the Left Front Lamp Assembly C1 harness connector.
4. Turn the ignition on.
5. Turn the Headlamps on.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Left Low Beam Bulb in accordance with the Service Information. Refer to UNIT, FRONT LAMP, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .