Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  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 BODY VERIFICATION TEST .
CHECK THE (F927) FUSED IGNITION CIRCUIT FOR AN OPEN OR SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Left Front Lamp Motor harness connector.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the (F927) Fused Ignition circuit in the Left Front Lamp Motor harness connector.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the (F927) Fused Run Relay Output circuit for an open or short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z901) GROUND CIRCUITS FOR AN OPEN
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12 volts, check the (Z901) Ground circuit in the Left Front Lamp Motor harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (Z901) Ground circuit(s) for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (D503) LIN LIGHTING CIRCUIT FOR A SHORT TO VOLTAGE
1. Disconnect the Automatic Headlamp Leveling Module (AHLM) harness connector.
2. Turn the ignition on.
3. Measure the voltage of the (D503) LIN Lighting circuit.
  Is there voltage present?
  
  Yes
  - Replace the Left Front Lamp Motor in accordance with the Service Information. Refer to UNIT, FRONT LAMP, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (D503) LIN LIGHTING CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Measure the resistance between ground and the (D503) LIN Lighting circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (D503) LIN Lighting circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (D503) LIN LIGHTING CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D503) LIN Lighting circuit between the Left Front Lamp Motor harness connector and the AHLM harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Automatic Headlamp Leveling Module (AHLM) in accordance with the Service Information. Refer to MODULE, HEADLAMP LEVELING (HLM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the (D503) LIN Lighting circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .