Component Circuits Diagnosis

HEADLAMP SWITCH
Refer to Turn Signals/Combination Switch for Lever Combination Switch (LCS) testing. Combination Switch

Repair/replace as needed.

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.

HEADLAMP BULBS
Visually inspect the high and low beam bulbs. Check resistance through the bulb.

Check for OPENS/SHORTS.

Repair/replace as needed.

INSTRUMENT PANEL CLUSTER AND DRL LOGIC
The DRL Logic is incorporated into the speedometer gage and is not separately replaceable.

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 disconnected).