Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. 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 DTCs.
3. Turn the Left Turn Signal on.
4. With the scan tool, read DTCs.
  Does the scan tool display DTC: B1644-REAR LEFT TURN LAMP CONTROL CIRCUIT HIGH?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (L63) LEFT REAR TURN LAMP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
1. Turn the Left Turn Signal off.
2. Turn the ignition off.
3. Disconnect the Left Tail Lamp Assembly harness connector.
4. Disconnect the TIPM C7 harness connector.
5. Turn the ignition on.
6. Measure the voltage between ground and the (L63) Left Rear Turn Lamp Driver circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L63) Left Rear Turn Lamp Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE TIPM FOR CORRECT OPERATION
1. Turn the ignition off.
2. Reconnect the TIPM C7 harness connector.
3. Connect a 12-volt test light between the (L63) Left Rear Turn Lamp Driver circuit and the (Z912) Ground circuit at the Left Tail Lamp Assembly harness connector.
4. Turn the ignition on.
5. Turn the Left Turn Signal on.
  Does the test light blink on and off?
  
  Yes
  - Replace the Left Rear Turn Signal Bulb in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE (L63) LEFT REAR TURN LAMP DRIVER CIRCUIT FOR AN OPEN IN THE HARNESS
1. Turn the ignition off.
2. Disconnect the TIPM C7 harness connector.
3. Measure the resistance of the (L63) Left Rear Turn Lamp Driver circuit between the Left Tail Lamp Assembly harness connector and the TIPM C7 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (L63) Left Rear Turn Lamp Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (Z912) GROUND CIRCUIT FOR AN OPEN IN THE HARNESS
1. Using a 12-volt test light connected to 12-volts, check the (Z912) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the open in the (Z912) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .