Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. Turn the Daytime Running Lamps (DRL) on.
3. With the scan tool, read 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 (L59) RIGHT DRL LAMP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the BCM C1/A harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (L59) Right DRL Lamp Driver circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (L59) Right DRL Lamp Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (L59) RIGHT DRL LAMP DRIVER CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance of the (L59) Right DRL Lamp Driver circuit between the Right Front Lamp Assembly harness connector and the BCM C1/A harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open in the (L59) Right DRL Lamp Driver circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z901) AND (Z902) GROUND CIRCUITS FOR AN OPEN
1. Measure the resistance between ground and the (Z901) Ground circuit at the Right Front Lamp Assembly harness connector.
2. Measure the resistance between ground and the (Z902) Ground circuit at the Right Front Lamp Assembly harness connector.
  Is the resistance below 3.0 Ohms for both connections?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (Z901) or (Z902) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE BCM FOR CORRECT OPERATION
1. Reconnect the BCM C1/A harness connector.
2. Turn the ignition on.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
3. Using a 12-volt test light connected to ground, check the (L59) Right DRL Lamp Driver circuit at the Right Front Lamp Assembly.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Right Daytime Running Lamp (DRL) Bulb in accordance with the Service information. Refer to UNIT, FRONT LAMP, STANDARD PROCEDURE .
  - 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 .