Dakota R/T 2WD V8-5.9L VIN Z LDC (1999)
Headlamp Switch: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
1. Disconnect and isolate the battery negative cable. Remove the headlamp switch from the instrument panel. Refer to Headlamp Switch in the
Replacement of Instrument Panel Systems for the procedures. Unplug the headlamp switch wire harness connectors. Check for continuity between
the left door jamb switch sense circuit cavity of the headlamp switch wire harness connector and a good ground. There should be continuity with
the driver door open, and no continuity with the driver door closed. If OK, go to Step 2. If not OK, repair the circuit to the driver door jamb switch
as required.
2. Remove the Central Timer Module (CTM) from its mounting bracket to access the CTM wire harness connectors. Refer to Central Timer Module
in the Replacement of Instrument Panel Systems for the procedures. Unplug the 14-way CTM wire harness connector. Remove the key from the
ignition lock cylinder. Check for continuity between the key-in ignition switch sense circuit cavity of the 14-way CTM wire harness connector and
a good ground. There should be no continuity If OK, go to Step 3. If not OK, repair the short circuit as required.
3. Check for continuity between the key-in ignition switch sense circuit cavities of the 14-way CTM wire harness connector and the headlamp switch
wire harness connector. There should be continuity If OK, go to Step 4. If not OK, repair the open circuit as required.
4. Check for continuity between the left front door jamb switch sense circuit terminal and the key-in ignition switch sense circuit terminal of the
headlamp switch. There should be no continuity with the switch in the Off position, and continuity with the switch in the park or head lamps On
position. If OK, see Central Timer Module in the Diagnosis and Testing. If not OK, replace the faulty headlamp switch.
