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 .
ATTEMPT TO SET THE OPPOSITE DTC
1. Turn the ignition off.
2. Disconnect the Left Front Lamp Assembly C1 harness connector.
3. Turn the ignition on.
4. Turn the Headlamps on.
5. With the scan tool, read DTCs.
  Does the scan tool display DTC: B162A-18-LEFT LOW BEAM CONTROL - UNDER CURRENT?
  
  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
  - Go To 3
CHECK THE (L43) LEFT LOW BEAM DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the BCM C3 harness connector.
3. Measure the resistance between ground and the (L43) Left Low Beam Driver circuit.
  Is the resistance above 10K Ohms?
  
  Yes
  - 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 .
  No
  - Repair the short to ground in the (L43) Left Low Beam Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .