Diagnostic Test

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 LEFT HEADLAMP LOW BEAM RELAY
1. Turn the Headlamps off.
2. Turn the ignition off.
3. Remove the Left Headlamp Low Beam Relay from the Front Power Distribution Center (PDC) Assembly and substitute it with a known good relay.
4. Turn the ignition on.
5. Turn the Headlamps on.
6. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 3
  No
  - Replace the Left Headlamp Low Beam Relay.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (L311) LEFT HEADLAMP RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the Headlamps off.
2. Turn the ignition off.
3. Remove the Left Headlamp Low Beam Relay from the Front PDC Assembly.
4. Disconnect the BCM C1/A harness connector.
5. Check for continuity between ground and the (L311) Left Headlamp Relay Control circuit at the Left Headlamp Low Beam Relay terminal in the Front PDC Assembly.
  Is there continuity between ground and the (L311) Left Headlamp Relay Control circuit?
  
  Yes
  - Repair the short to ground in the (L311) Left Headlamp Relay Control circuit.
  - 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 (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .