Component Circuits Diagnosis

Headlamp Switch
Refer to "Lever Combination Switch (LCS)" for testing. Testing and Inspection
Repair/replace as needed.
If this component is good go to the next item indicated on the Complaint-Condition Chart.

Park Brake Switch
Check the BRAKE telltale. It should light with the park brake On. It should not be lit with the park brake Off (under normal operating conditions).
Check for park brake switch resistance.
Switch Resistance: Open when the park brake is Off. Less than one ohm when the park brake is On.

DRL Relay
The Lock, Unlock and DRL relays are interchangeable only with each other.
Substitute another relay to see if the problem is fixed Repair/replace as needed.
If this component is good go to the next item indicated on the Complaint-Condition Chart.

Headlamp Bulbs
Visually inspect the high and low beam bulbs. Check resistance through the bulb.
Check for OPENS/SHORTS.
Repair/replace as needed.
If this component is good go to the next item indicated on the Complaint-Condition Chart.

Instrument Panel Cluster and DRL Logic
The DRL Logic is not separately replaceable from the instrument panel cluster.
With the key in the RUN position the following readings should appear when taking measurements at the pins of the instrument cluster harness connector (instrument cluster removed).

Black Connector
Pin L - Battery voltage
Pin M - Battery voltage
Pin K - Continuity to ground
Pin N 0 Volts (headlamps On and headlamp switch in high beam position or flash-to-pass)
Battery voltage (any other time)
Pin O 0 Volts (headlamps On and headlamp switch in low beam position)
Battery voltage (any other time)

Natural Connector
Pin L - Battery voltage
Pin F - Continuity to ground (with park brake On) Open (with park brake Off)
If any of the above cheeks fail, repair an open/short in the malfunctioning circuit.
If all the above checks are correct and all other possible causes are ok, the problem is most likely the cluster (connections, flex circuits, etc.) or the DRL Logic (which is located internal to the cluster housing). Replace instrument panel Cluster Housing, refer to the "Audio System and I/P Cluster for procedures. Verify that the complaint has been fixed.
Repair/replace as needed.
If this component is good go to the next item indicated on the Complaint-Condition Chart.