Turn Signal Indicator Lamp; Upshift Indicator Lamp; Vehicle Information Center - Jeep 1997 Grand Cherokee Service Manual

ZG
DIAGNOSIS AND TESTING (Continued)
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M - PASSIVE RESTRAINT
SYSTEMS BEFORE ATTEMPTING STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL COM-
PONENT DIAGNOSIS OR SERVICE. FAILURE TO
TAKE THE PROPER PRECAUTIONS COULD RESULT
IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSI-
BLE PERSONAL INJURY.
If the seat belt reminder lamp fails to light during
its display function, replace the seat belt reminder
lamp bulb with a known good unit. If the reminder
lamp still fails to operate, diagnosis of the lamp, and
the instrument cluster circuitry should be performed
with a DRB scan tool as described in the proper Body
Diagnostic Procedures manual.

TURN SIGNAL INDICATOR LAMP

The diagnosis found here addresses an inoperative
turn signal indicator lamp condition. For any other
turn signal problem, refer to Group 8J - Turn Signal
and Hazard Warning Systems for diagnosis. If no
turn signal or hazard warning system problem is
found, the following procedure will help locate a
short or open in the indicator lamp circuit. For cir-
cuit descriptions and diagrams, refer to 8W-40 -
Instrument Cluster and 8W-50 - Front Lighting in
Group 8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M - PASSIVE RESTRAINT
SYSTEMS BEFORE ATTEMPTING STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL COM-
PONENT DIAGNOSIS OR SERVICE. FAILURE TO
TAKE THE PROPER PRECAUTIONS COULD RESULT
IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSI-
BLE PERSONAL INJURY.
(1) Disconnect and isolate the battery negative
cable. Remove the instrument cluster bezel and the
cluster assembly as described in this group.
(2) Connect the battery negative cable. Activate
the hazard warning system by depressing the hazard
warning switch. Check for battery voltage at the
inoperative (right or left) turn signal indicator lamp
circuit cavity of the cluster wire harness connector.
There should be a switching (on and off) battery volt-
age signal. If OK, replace the faulty (right or left)
indicator bulb. If not OK, repair the open circuit to
the turn signal (multi-function) switch as required.

UPSHIFT INDICATOR LAMP

The diagnosis found here addresses an inoperative
upshift indicator lamp condition. If lamp accuracy is
suspect, diagnosis should be performed with a DRB
scan tool as described in the proper Powertrain Diag-
nostic Procedures manual. For circuit descriptions
INSTRUMENT PANEL SYSTEMS
and diagrams, refer to 8W-40 - Instrument Cluster in
Group 8W - Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M - PASSIVE RESTRAINT
SYSTEMS BEFORE ATTEMPTING STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL COM-
PONENT DIAGNOSIS OR SERVICE. FAILURE TO
TAKE THE PROPER PRECAUTIONS COULD RESULT
IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSI-
BLE PERSONAL INJURY.
If the upshift indicator lamp fails to light during
the bulb test (about three seconds after the ignition
switch is turned to the On position), replace the
upshift indicator lamp bulb with a known good unit.
If the indicator lamp still fails to operate, diagnosis
of the lamp, the instrument cluster circuitry, or the
CCD data bus should be performed with a DRB scan
tool as described in the proper Body Diagnostic Pro-
cedures manual. Diagnosis of the Powertrain Control
Module (PCM) should be performed with a DRB scan
tool as described in the proper Powertrain Diagnostic
Procedures manual.

VEHICLE INFORMATION CENTER

The Vehicle Information Center (VIC) has a num-
ber of display functions and features. The diagnosis
found here addresses only those VIC messages and
functions that are controlled by hard-wired inputs. To
diagnose any internally controlled VIC function or
feature, or any that are enabled by inputs on the
CCD data bus network, use a DRB scan tool and the
proper Body Diagnostic Procedures manual. Refer to
8W-46 - Message Center in Group 8W - Wiring Dia-
grams for complete circuit descriptions and diagrams.
COOLANT LEVEL LOW/COOLANT SENSOR
BAD
If the problem being diagnosed is related to lamp
accuracy, be certain to confirm that the problem is
with the lamp and sensor and not with the engine
coolant level. The actual engine coolant level should
be checked before you proceed with lamp and sensor
diagnosis. Refer to 8W-46 - Message Center in Group
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M - PASSIVE RESTRAINT
SYSTEMS BEFORE ATTEMPTING STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL COM-
PONENT DIAGNOSIS OR SERVICE. FAILURE TO
TAKE THE PROPER PRECAUTIONS COULD RESULT
IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSI-
BLE PERSONAL INJURY.
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