Diagnostic Test

CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Turn the ignition on.
2. Using the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 2
  No
  - If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out or corroded terminals.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(W12) REAR WIPER RELAY CONTROL CIRCUIT SHORTED TO GROUND

Fig 1: Checking Rear Wiper Relay Control Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Junction Block C1 harness connector.
3. Measure the resistance between ground and the (W12) Rear Wiper Relay Control circuit at the Junction Block C1 harness connector.
  Is the resistance below 100.0 Ohms?
  
  Yes
  - Go to step 3
  No
  - Replace the Junction Block in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(W12) REAR WIPER RELAY CONTROL CIRCUIT SHORTED TO GROUND

Fig 2: Checking Rear Wiper Relay Control Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Disconnect the IPM C2 harness connector.
2. Measure the resistance between ground and the (W12) Rear Wiper Relay Control circuit at the Junction Block C1 harness connector.
  Is the resistance below 100.0 Ohms?
  
  Yes
  - Repair the (W12) Rear Wiper Relay Control circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 4
INTEGRATED POWER MODULE (IPM) / FRONT CONTROL MODULE (FCM)

Fig 3: Checking Rear Wiper Relay Control Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Reconnect the IPM C2 harness connector.
2. Remove the FCM from the IPM.
3. Measure the resistance between ground and the (W12) Rear Wiper Relay Control circuit at the Junction Block C1 harness connector.
  Is the resistance below 100.0 Ohms?
  
  Yes
  - Replace the 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 FCM in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .