Low Beam Headlamps Inoperative

Possible Causes:

• Intermittent Condition
• Low Beam Relay
• Open Fused B+ Circuit
• Low Beam Relay Control Circuit
• Low Beam Relay
• Body Control Module

Testing

1. Turn the Low Beams on. Do the Low Beam Headlamps operate properly? If yes, the condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires. Perform BODY VERIFICATION TEST  . If no, go to next step.
2. Remove the Low Beam Relay from the Junction Block. Install a known-good relay in place of the Low Beam Relay. With the DRBIII(R), actuate the Low Beam Relay. Do the Headlamps flash while actuating the Low Beam Relay? If yes, replace the Low Beam Relay. Perform BODY VERIFICATION TEST  . If no, go to next step.
3. Remove the Low Beam Relay from the Junction Block. Measure the voltage of the Fused B+ circuit at the Low Beam Relay connector. Is the voltage above 10.0 volts? If yes, go to next step. If no, repair the open fused B+ circuit. Perform BODY VERIFICATION TEST  .
4. Remove the BCM from the junction block. Connect a jumper wire between the Fused B+ circuit and the Low Beam Relay Control circuit at the Low Beam Relay connector. Measure the voltage of the Low Beam Relay Control circuit to the BCM Junction Block connector. Is the voltage above 10.0 volts? If yes, go to next step. If no, repair the Low Beam Relay Control circuit for an open condition. Perform BODY VERIFICATION TEST  .
5. Disconnect the jumper wire. Reinstall the Low Beam Relay in the Junction Block. Remove the BCM from the junction block. Measure the voltage of the Low Beam Relay Control circuit to the BCM internal connector. Is the voltage above 10.0 volts? If yes, replace the Body Control Module. Perform BODY VERIFICATION TEST  . If no, replace the Low Beam Relay. Perform BODY VERIFICATION TEST  .