Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. 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 Reading Lamps 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 STANDARD PROCEDURE .
CHECK THE (M27) READING/RAIL LAMPS DRIVER CIRCUIT FOR A SHORT TO GROUND

Fig 1: Measuring Resistance Between Ground & Reading/Rail Lamps Driver Circuit
Courtesy of CHRYSLER GROUP, LLC

NOTE:
Inspect the Dome Lamps and Dome Lamp Assemblies. If necessary repair or replace the Dome Lamps or Dome Lamp Assemblies if damaged.
1. Turn the ignition off.
2. Disconnect the Dome Lamp harness connectors.
3. Disconnect the Cluster C2 harness connector.
4. Measure the resistance between ground and the (M27) Reading/Rail Lamps Driver circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (M27) Reading/Rail Lamps Driver circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .