Diagnostic Test

Turn the ignition on.

With the scan tool, clear all BCM DTC's.

Turn the Low Beams on.

With the scan tool, read the DTC information.

Does the scan tool read: LOW BEAM RELAY CIRCUIT HIGH? 

Yes 

1. Go to step  2).

No 

1. The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
2. Perform BODY VERIFICATION TEST .

Turn the ignition off.

Check the Junction Block to make certain the Low Beam Relay is present.

Is the Low Beam Relay present? 

Yes 

1. Go to step  3).

No 

1. Replace the missing Low Beam Relay.
2. Perform BODY VERIFICATION TEST .

Turn the ignition off.

Check the Junction Block Low Beam fuses 4 and 5.

Are any of the fuses open? 

Yes 

1. Replace the open fuse.
2. Perform BODY VERIFICATION TEST .

No 

1. Go to step  4).

Turn the ignition off.

Install a known good relay in place of the Low Beam Relay.

Turn the Low Beams On.

Do the Low Beams operate normally? 

Yes 

1. Replace the Low Beam Relay.
2. Perform BODY VERIFICATION TEST .

No 

1. Go to step  5).

Turn the ignition off

Remove the Low Beam Relay.

Measure the voltage of the Fused B+ circuit of the Low Beam Relay.

Is the voltage above 10 volts? 

Yes 

1. Replace the Body Control Module.
2. Perform BODY VERIFICATION TEST .

No 

1. Repair the Fused Low Beam Relay Output circuit for an open condition.
2. Perform BODY VERIFICATION TEST .