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.

TEST FOR INTERMITTENT CONDITION
1. With the scan tool, record and erase DTCs
2. Operate the Driver Door Lock Switch several times.
3. Turn the ignition on and wait 30 seconds.
4. With the scan tool, read DTCs.
  Does the scan tool display B1803 - DRIVER DOOR LOCK/UNLOCK SWITCH INPUT CIRCUIT STUCK LOCK?
  
  Yes
  - Go To 2.
  No
  - The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
DOOR LOCK SWITCH

Fig 1: Checking Door Lock Switch
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Driver Window/Door Lock Switch C2 connector.
2. Turn the ignition on.
3. Measure the voltage between the (D500) Lin Bus circuit and the (D501) Lin Bus Return circuit.
  Is the voltage between 6.5 and 12.5 volts?
  
  Yes
  - Replace the Driver Window/Door Lock Switch.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3.
(D501) LIN BUS RETURN CIRCUIT OPEN

Fig 2: Checking LIN Bus Return Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Using a 12-volt test light connected to 12-volts, check the (D501) Lin Bus Return circuit.
  Does the test light illuminate brightly?
  
  No
  - Repair the (D501) Lin Bus Return circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  Yes
  - Go To 4.
(D500) LIN BUS CIRCUIT OPEN

Fig 3: Checking LIN Bus Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Driver Door Module C5 connector.
2. Measure the resistance of the (D500) Lin Bus circuit between the Door Module C5 connector and the Window/Door Lock Switch connector.
  Is the resistance below 2.0 ohms?
  
  No
  - Repair the (D500) Lin Bus circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  Yes
  - Go To 5.
(D500) LIN BUS CIRCUIT SHORT TO THE (D501) LIN BUS RETURN CIRCUIT

Fig 4: Checking LIN Bus Circuit For A Short To The LIN Bus Return Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (D500) Lin Bus circuit and the (D501) Lin Bus Return circuit in the Window/Door Lock Switch connector.
  Is the resistance below 10, 000 ohms?
  
  Yes
  - Repair the (D500) Lin Bus circuit for a short to the (D501) Lin Bus Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Driver Door Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .