data bus message inputs, a DRB scan tool and the
proper Diagnostic Procedures manual are recom-
mended.
Refer to Group 8E - Instrument Panel Systems for
the
instrument
cluster
service
procedures.
The
instrument cluster chime warning circuitry and
chime tone generator cannot be repaired and, if
faulty or damaged, the instrument cluster assembly
must be replaced.
DRIVER DOOR JAMB SWITCH
The driver door jamb switch is mounted to the
driver side front door hinge pillar. The switch closes
a path to ground for the instrument cluster chime
warning circuitry through the key-in ignition switch
and/or the headlamp switch when the driver door is
opened, and opens the ground path when the driver
door is closed.
The driver door jamb switch cannot be repaired
and, if faulty or damaged, it must be replaced. Refer
to Group 8L - Lamps for the service procedures.
DRIVER SEAT BELT SWITCH
The driver seat belt switch is integral to the driver
seat belt buckle-half assembly. The switch is nor-
mally closed, providing a ground path to the instru-
ment panel chime warning circuitry. When the tip-
half of the seat belt is inserted into the seat belt
buckle, the switch opens the ground path.
The driver seat belt switch cannot be repaired and,
if faulty or damaged, the entire driver seat belt buck-
le-half unit must be replaced. Refer to Group 23 -
Body for the service procedures.
KEY-IN IGNITION SWITCH
The key-in ignition switch is integral to the igni-
tion switch, which is mounted on the left side of the
steering column, opposite the ignition lock cylinder.
It closes a path to ground for the instrument cluster
chime warning circuitry when the ignition key is
inserted in the ignition lock cylinder and the driver
door jamb switch is closed (driver door is open). The
key-in ignition switch opens the ground path when
the key is removed from the ignition lock cylinder.
The key-in ignition switch cannot be repaired and,
if faulty or damaged, the entire ignition switch must
be replaced. Refer to Group 8D - Ignition Systems for
the service procedures.
HEADLAMP SWITCH
The headlamp switch is located in the instrument
panel, outboard of the steering column. It closes a
path to ground for the instrument cluster chime
warning circuitry when the park or head lamps are
on and the driver door jamb switch is closed (driver
door is open). The headlamp switch opens the ground
path when the headlamp switch is turned off.
The headlamp switch cannot be repaired and, if
faulty or damaged, it must be replaced. Refer to
Group 8E - Instrument Panel Systems for the service
procedures.
DIAGNOSIS AND TESTING
DRIVER DOOR JAMB SWITCH
For circuit descriptions and diagrams, refer to
8W-40 - Instrument Cluster or 8W-44 - Interior
Lighting in Group 8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
GROUP
8M
-
PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING
WHEEL,
STEERING
COLUMN,
OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Rotate the headlamp switch knob counterclock-
wise to ensure that the dome lamps are not switched
off. Open the driver door and note whether the inte-
rior lamps light. They should light. If OK, see the
diagnosis for the Key-In Ignition Switch or the Head-
lamp Switch in this group. If not OK, go to Step 2.
(2) Disconnect and isolate the battery negative
cable. Unplug the driver door jamb switch from its
wire harness connector. Check for continuity between
the ground circuit cavity of the driver door jamb
switch wire harness connector and a good ground.
There should be continuity. If OK, go to Step 3. If not
OK, repair the circuit to ground as required.
(3) Check for continuity between the door jamb
switch ground circuit terminal and the left front door
jamb switch sense terminal of the door jamb switch.
There should be continuity with the switch plunger
released, and no continuity with the switch plunger
depressed. If not OK, replace the faulty switch.
DRIVER SEAT BELT SWITCH
For circuit descriptions and diagrams, refer to
8W-40 - Instrument Cluster or 8W-44 - Interior
Lighting in Group 8W - Wiring Diagrams.
8U - 2
CHIME/BUZZER WARNING SYSTEMS
XJ
DESCRIPTION AND OPERATION (Continued)