Diagnostic Test

WARNING: This page is about a different car, the 2012 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR ACTIVE DTC
NOTE:
Check to make sure the battery and charging system are operating properly. Battery and charging system problems may cause these DTCs to set.

NOTE:
Diagnose any related Powertrain DTC(s) before continuing.
1. Turn the ignition on.
2. With a scan tool, read, record and erase WCM DTC(s).
3. Perform five ignition cycles, leaving the ignition switch on for a minimum of 30 seconds per cycle.
4. Using the scan tool, read WCM DTC(s).
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2.
  No
  - The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(F20) IGNITION SWITCH OUTPUT (RUN-START) SHORTED TO BATTERY VOLTAGE

Fig 1: Checking Ignition Switch Output (Run-Start) For A Short To Battery Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the WCM harness connector.
3. Using a 12-volt test light connected to ground, probe the (F20) Ignition Switch Output (Run-Start) circuit in the WCM harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Repair the (F20) Ignition Switch Output (Run-Start) circuit for a short to battery voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace and program the Wireless Control Module (WCM) in accordance with the Service Information.
  - Perform WCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .