Diagnostic Test

INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all Front Control Module (FCM) DTCs.
3. Turn the Rear Wipers on.
4. With the scan tool, read the Rear Wiper DTCs.
  Does the scan tool read: B231C-REAR WIPER MOTOR CONTROL CIRCUIT HIGH?
  
  Yes
  - Go to step 2
  No
  - The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
WIPER MOTOR REAR
1. Turn the ignition off.
2. Disconnect the Rear Wiper Motor connector.
3. Measure the internal resistance of the Wiper Motor between cavity 1 and 2 of the Motor.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Replace the Rear Wiper Motor in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 3
(Z945) WIPER MOTOR GROUND CIRCUIT OPEN

Fig 1: Checking Wiper Motor Ground Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Rear Wiper Motor harness connector.
3. Measure the resistance between ground and the (Z945) Rear Wiper Motor ground circuit.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open in the (Z945) Rear Wiper Motor Ground circuit.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 4
(W13) REAR MOTOR CONTROL CIRCUIT OPEN

Fig 2: Checking Rear Motor Control Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the IPM C2 harness connector.
2. Measure the resistance of the (W13) Rear Wiper Motor Control circuit.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open in the (W13) Rear Wiper Motor Control circuit.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 5
FRONT CONTROL MODULE (FCM)
1. Turn the ignition off.
2. Disconnect the IPM from the FCM.
3. Measure the internal resistance of the (W13) Rear Wiper Motor Control circuit at the IPM C2 connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Replace the Integrated Power Module (IPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .