Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Clear all FCM DTC's.
3. Shift the transmission into reverse.
4. With the scan tool, read DTC's.
  Does the scan tool read: B1668-REVERSE LAMP CONTROL CIRCUIT HIGH?
  
  Yes
  - Go to step 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. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
(L1) BACK-UP LAMP FEED CIRCUIT SHORT TO VOLTAGE

Fig 1: Checking Back-Up Lamp Feed Circuit Short To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the IPM C2 harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (L1) Back-up Lamp Feed circuit.
  Is the voltage greater than 10.0 volts?
  
  Yes
  - Repair the (L1) Back-up Lamp Feed circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure
  No
  - Replace the IPM in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure