Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. Turn the Headlamps on.
3. With the scan tool, read the Body Control Module (BCM) DTCs and record on the repair order.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - 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. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (L307) HEADLAMP SWITCH MUX CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (L307) Headlamp Switch MUX circuit at the Headlamp Switch harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (L307) Headlamp Switch MUX circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (L307) HEADLAMP SWITCH MUX CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the BCM G harness connector.
3. Measure the resistance of the (L307) Headlamp Switch MUX circuit between the Headlamp Switch harness connector and the BCM G harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the (L307) Headlamp Switch MUX circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT FOR AN OPEN
1. Measure the resistance of the (L900) Headlamp Switch MUX Return circuit between the Headlamp Switch harness connector and the BCM G harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the (L307) Headlamp Switch MUX Return circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
HEADLAMP SWITCH
1. Turn the ignition off.
2. Reconnect the BCM G harness connector.
3. Connect a jumper wire between ground and the (L307) Headlamp Switch MUX circuit at the Headlamp Switch harness connector.
4. Turn the ignition on.
5. With the scan tool, read the BCM DTCs.
  Does the scan tool display DTC: B178E-11-HEADLAMP SWITCH INPUT - CIRCUIT SHORT TO GROUND?
  
  Yes
  - Replace the Headlamp Switch in accordance with the Service Information. Refer to SWITCH, HEADLAMP, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .