Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
After a Fault Sense circuit repair is completed, or the Lamp Assembly is replaced, the Left Turn Lamps must be activated for at least 20 cycles, in order for the DTC status to change from Active to Stored. After the DTC status has changed to Stored, the DTC can be erased.
1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, read BCM DTCs.
  Is the DTC Active?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR INTERMITTENT CONDITIONS procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE BCM LIGHTING FAULT SENSE VOLTAGE OUTPUT
NOTE:
Make sure the Turn Lamps are off when performing this step.
1. Turn the Left Turn Lamps off.
2. Turn the ignition off.
3. Disconnect the Left Front Lamp Assembly harness connector.
4. Turn the ignition on.
5. Measure the voltage on the (L551) Left Front Lighting Fault Sense circuit at the Left Front Lamp Assembly harness connector.
  Is the voltage approximately 12 volts (system voltage)?
  
  Yes
  - Go To 3
  No
  - Go To 7
CHECK FOR VOLTAGE ON THE (L61) LEFT FRONT TURN LAMP DRIVER CIRCUIT
1. Turn the Left Turn Lamps on.
2. Measure the voltage on the (L61) Left Front Turn Lamp Driver circuit at the Left Front Lamp Assembly harness connector.
  Is the voltage approximately 12 volts (system voltage)?
  
  Yes
  - Go To 4
  No
  - Go To 8

CHECK THE LEFT FRONT LAMP ASSEMBLY GROUND CIRCUIT(S) FOR AN OPEN OR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT

NOTE:

If a load test tool needs to be created, follow the steps in Tech Tips/Engineering Notes.

NOTE:

Note: Why load test a circuit? A load test is used to determine if a circuit is capable of carrying the amperage needed to perform properly. The 3156 Bulb in the load tool illustrated, is a simple but effective method of testing circuit functionality. A 3156 Bulb has approximately 6.0 Ohms of resistance when the bulb is powered and draws approximately 2.0 amps of current. Read the CIRCUIT VOLTAGE DROP AND LOAD TESTING PROCEDURES for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT TESTING PROCEDURES .

NOTE:

Note: A 12-volt test light can be substituted for the load test tool, but only if the test light draws enough current to effectively load test the circuit. Many high impedance test lights draw very little amperage (less than 0.1 amps) and are not reliable to load test a circuit. To perform a proper load test of a circuit, the tool being used should draw more than approximately 0.75 amps.

NOTE:

Note: Why perform a Voltage Drop Test: To verify with certainty there is not any resistance in the circuit being tested, perform a simple voltage drop test across the 3156 Bulb of the load test tool. To do so perform the following:

1. Connect the leads of a DVOM to the alligator clips on the load test tool while the load test tool is connected in series with the circuit.
2. Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
3. The voltage dropped across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested.

Example: 2.0 Ohms of resistance in the circuit being tested will cause the voltage measurement across the bulb to be 25% less than when compared to Battery voltage. The reason for this is that the 2.0 Ohms in the circuit makes up 25% of the total circuit resistance of 8.0 Ohms. Read the CIRCUIT VOLTAGE DROP AND LOAD TESTING PROCEDURES for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT TESTING PROCEDURES .

Turn the Turn Lamps off.
Turn the ignition off.
Connect the positive lead of the load test tool to a 12 volt circuit at the Front Lamp harness connector.

Connect the negative lead of the load test tool to the Ground circuit(s) at the Front Lamp harness connector (A). Note: refer to the diagram below.

Courtesy of CHRYSLER GROUP, LLC

NOTE:

The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuit(s).

NOTE:

Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery.

Is the load test bulb illuminated and bright?

Yes

Go To 5

Repair the open or high resistance in the Front Lamp Ground circuit(s).
Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

CHECK FOR VOLTAGE ON THE (L551) LEFT FRONT LIGHTING FAULT SENSE CIRCUIT
1. Reconnect the Left Front Lamp Assembly harness connector.
2. Turn the ignition on.
3. Turn the Left Turn Lamps on.
  NOTE:
  To avoid damage to the terminals, insulation or weather-proof seals of the connector, use only approved connector back-probe tools when back-probing a connector.
4. Back-probing at the Left Front Lamp Assembly harness connector, measure the voltage on the (L551) Left Front Lighting Fault Sense circuit.
  Does the voltage cycle from approximately 12 volts (system voltage) to below 6 volts, in sequence with Turn Lamp flashes?
  
  Yes
  - Go To 6
  No
  - Go To 9
CHECK THE OPERATION OF THE LEFT FRONT TURN LAMP
1. With the Left Turn Lamps on, inspect the illumination of the Left Front Turn Lamp.
  Does the Left Front Turn Lamp illuminate?
  
  Yes
  - Go To 10
  No
  - Disconnect and check the Left Front Lamp Assembly harness connector for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. If no problems are found, replace the Left Front Lamp Assembly in accordance with the Service Information. Refer to UNIT, HEADLAMP, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (L551) LEFT FRONT LIGHTING FAULT SENSE CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the BCM C6/F harness connector.
3. Measure the resistance of the (L551) Left Front Lighting Fault Sense circuit between the Left Front Lamp Assembly harness connector and the BCM C6/F harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open or high resistance in the (L551) Left Front Lighting Fault Sense circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 10
CHECK THE (L61) LEFT FRONT TURN LAMP DRIVER CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the BCM C4/D harness connector.
3. Measure the resistance of the (L61) Left Front Turn Lamp Driver circuit between the Left Front Lamp Assembly harness connector and the BCM C4/D harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open or high resistance in the (L61) Left Front Turn Lamp Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 10
CHECK THE (L551) LEFT FRONT LIGHTING FAULT SENSE CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT IN THE HARNESS CONNECTOR
NOTE:
The ignition may not turn on when the BCM harness connector, containing the circuit being tested, is disconnected. Therefore, this step can help determine if the circuit being tested is shorted to another voltage circuit in any of the related harness connectors.
1. Disconnect the BCM C6/F harness connector.
2. Check for continuity between the (L551) Left Front Lighting Fault Sense circuit and all other circuits on the Left Front Lamp Assembly harness connector.
3. Check for continuity between the (L551) Left Front Lighting Fault Sense circuit and all other circuits on the BCM C6/F harness connector.
  Is there continuity between the (L551) Left Front Lighting Fault Sense circuit and any other circuit(s)?
  
  Yes
  - Repair the short between the (L551) Left Front Lighting Fault Sense circuit and the circuit that has continuity.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Inspect the (L551) Left Front Lighting Fault Sense circuit for a short to voltage between the Left Front Lamp Assembly harness connector and the BCM C6/F harness connector. Repair, if needed. If no problems are found, replace the Left Front Lamp Assembly in accordance with the Service Information. Refer to UNIT, HEADLAMP, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
DISCONNECT RELATED BCM HARNESS CONNECTIONS AND INSPECT FOR PROBLEMS
1. Disconnect all BCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.