Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 4.
  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.
CHECK THE VOLTAGE OF THE (M27) READING/RAIL LAMPS DRIVER CIRCUIT

Fig 1: Measuring Voltage Of Reading/Rail Lamps Driver circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Electronic Overhead Module C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (M27) Reading/Rail Lamps Driver circuit.
  Is the voltage above 10.0 volts?
  
  Yes
  - Go To 3.
  No
  - Go To 4.
CHECK THE (Z903) GROUND CIRCUIT

Fig 2: Measuring Resistance Between Ground & Ground Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (Z903) Ground circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Replace the Electronic Overhead Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Repair the open in the (Z903) Ground Circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
CHECK THE (M27) READING/RAIL LAMPS DRIVER CIRCUIT FOR A SHORT TO GROUND

Fig 3: Measuring Resistance Between Ground & Reading/Rail Lamps Driver Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the Cluster C2 harness connector.
2. Measure the resistance between ground and the (M27) Reading/Rail Lamps Driver circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the short to ground in the (M27) Reading/Rail Lamps Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Go To 5.
CHECK THE (M27) READING/RAIL LAMPS DRIVER CIRCUIT FOR AN OPEN

Fig 4: Measuring Resistance Of Reading/Rail Lamps Driver Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (M27) Reading/Rail Lamps Driver circuit.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open in the (M27) Reading/Rail Lamps Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Replace the Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .