Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the Scan Tool, clear all FCM DTC's.
3. Turn the Front Wipers on.
4. With the Scan Tool, read the Front Wiper DTC's.
  Does the Scan Tool read: B2305-WIPER PARK SWITCH INPUT 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
(W7) FRONT WIPER PARK SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Fig 1: Checking Front Wiper Park Switch Sense Circuit Short To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Front Wiper Motor harness connector.
3. Disconnect the IPM C1 harness connector.
4. Measure the voltage on the (W7) Front Wiper Park Switch Sense circuit.
  Is the voltage above 5.0 volts?
  
  Yes
  - Repair the (W7) Front Wiper Park Switch Sense circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
  No
  - Go to step 3
CHECK THE FRONT WIPER MOTOR
1. Connect a jumper wire between the (W7) Wiper Park Switch Sense circuit and ground.
2. With the Scan Tool, read the Front Wiper Park Switch Sense.
  Does the Front Wiper Park Switch Sense display: True?
  
  Yes
  - Replace the Front 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 4
(W7) FRONT WIPER PARK SWITCH SENSE CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the IPM C1 harness connector.
3. Measure the resistance of the (W7) Front Wiper Park Switch Sense circuit between the Front Wiper Motor harness connector and the IPM C1 harness connector.
  Is the resistance below 10.0 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
  - Repair the (W7) Front Wiper Park Switch Sense circuit for an open.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure