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
NOTE:
If the scan tool displays any other power window DTCs, repair them first before continuing.
1. Turn the ignition on.
2. With the scan tool, record and erase the DTCs
3. Try to operate the Front Windows up and down several times.
4. Wait 30 seconds.
5. With the scan tool, read the DTCs.
  Does the scan tool display: U113D-LOST COMMUNICATION WITH MASTER POWER WINDOW SWITCH?
  
  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 .
(A855) FUSED B(+) CIRCUIT OPEN
NOTE:
Make sure Fuse M26 in the TIPM is good before proceeding.

Fig 1: Checking Fused B(+) Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. With the scan tool, erase the DTCs.
2. Turn the ignition off.
3. Disconnect the Driver Window/Door Lock Switch C2 connector.
4. Turn the ignition on.
5. Using a 12-volt test light connected to Ground, check the (A855) Fused B(+) circuit in the Driver Window/Door Lock Switch C2 connector (Cav. 1 - Express, Cav. 9 - Except Express).
  Does the test light illuminate brightly?
  
  No
  - Repair the (A855) Fused B(+) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  Yes
  - Go To 3.
CHECK THE LIN BUS CIRCUIT

Fig 2: Checking LIN BUS Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage between the (D500) LIN Bus circuit and the (D501) LIN Bus Return circuit.
  Is the voltage above 9.0 volts?
  
  No
  - Go To 5.
  Yes
  - Go To 4.
(D500) LIN BUS CIRCUIT SHORT TO VOLTAGE

Fig 3: Checking LIN BUS Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Driver Door Module C5 connector.
3. Turn the ignition on.
4. Measure the voltage between Ground and the (D500) LIN Bus circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (D500) LIN Bus circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Driver Window/Door Lock Switch.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(D501) LIN BUS RETURN CIRCUIT OPEN

Fig 4: 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 in the Window Switch connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 6.
  No
  - Repair the (D501) LIN Bus Return circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(D500) LIN BUS CIRCUIT SHORT TO GROUND

Fig 5: Checking LIN BUS Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Driver Door Module C5 connector.
3. Measure the resistance between Ground and the (D500) LIN Bus circuit in the Door Module C5 connector.
  Is the resistance below 10, 000 ohms?
  
  Yes
  - Repair the (D500) LIN Bus circuit for a short to the ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 7.
(D500) LIN BUS CIRCUIT OPEN

Fig 6: Checking LIN Bus Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (D500) LIN Bus circuit between the Door Module C5 connector and the Driver Express Window/Door Lock Switch C2 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
  - Replace the Driver Door Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .