1988 JEEP CHEROKEE diagram

ALTERNATOR article








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Alternator Blown fuse See WIRING DIAGRAMS
Light Stays Off
With Ignition
Switch ON
Defective alternator See Testing in
ALTERNATOR article
Defective indicator light See Indicator Warning
bulb or socket Lights in STANDARD
INSTRUMENTS in the
ACCESSORIES &
EQUIPMENT section









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Alternator Short in alternator wiring See On-Vehicle Tests
Light Stays OFF in ALTERNATOR article
With Ignition
Switch ON
Defective rectifier bridge See Bench Tests in
ALTERNATOR article









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Lights or Fuses Defective alternator wiring See On-Vehicle Tests
Burn Out in ALTERNATOR article
Frequently
Defective regulator See Regulator Check in
ALTERNATOR article
Defective battery Check and replace as
necessary









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Ammeter Gauge Loose or worn drive belt Check alternator drive
Shows Discharge belt tension and
condition. See Belt
Adjustment in TUNE-UP
article in the
TUNE-UP section
Defective wiring Check all wires and
wire connections
Defective alternator or See Bench Tests and
regulator On-Vehicle Tests in
ALTERNATOR article
Defective ammeter, or See Testing in
improper ammeter wiring STANDARD INSTRUMENTS
connection in the ACCESSORIES &
EQUIPMENT section









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Noisy Loose drive pulley Tighten drive pulley
Alternator attaching nut
Loose mounting bolts Tighten all alternator
mounting bolts
Worn or dirty bearings See Bearing
Replacement
ALTERNATOR article

VA C UUM D IA G RAM S

1988 J e ep C hero ke e
1988 Exhaust Emission Systems
JEEP VACUUM DIAGRAMS
DIAGRAM ABBREVIATIONS
JEEP VACUUM DIAGRAM ABBREVIATIONS








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CTO .......... Coolant Temperature Override
EGR ............. Exhaust Gas Recirculation
HDC CTO ............... Heavy Duty Cooling,
Coolant Temperature Override
PCV ........ Positive Crankcase Ventilation
TAC .............. Thermostatic Air Cleaner
VSD .................... Vacuum Signal Dump









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VACUUM DIAGRAMS
Fig. 1: 2.5L 4-Cylinder
Courtesy of Chrysler Motors.

WIR IN G D IA G RAM S YM BO LS

1988 J e ep C hero ke e
WIRING DIAGRAMS
How To Use The Wiring Diagrams
WIRING DIAGRAMS
INTRODUCTION
The wiring diagrams and technical service bulletins,
containing wiring diagram changes, are obtained from the domestic and
import manufacturers. These are checked for accuracy and are all
redrawn into a consistent format for easy use.
All diagrams are arranged with the front of the vehicle at
the left side of the first page and the rear of the vehicle at the
right side of the last page. Accessories are shown near the end of the
diagram.
Components are shown in their approximate location on the
vehicle. Due to the constantly increasing number of components on
vehicles today, it is impossible to show exact locations.
In the past, when cars were simpler, diagrams were simpler.
All components were connected by wires, and diagrams seldom exceeded 4
pages in length. Today some wiring diagrams require more than 16
pages. It would be impractical to expect a service technician to trace
a wire from page 1 across every page to page 16.
Removing some of the wiring maze reduces eyestrain and time
wasted searching across several pages. Today, the majority of diagrams
now follow a much improved format, which permits space for internal
switch details and connector shapes.
Any wires that don't connect directly to their components are
identified on the diagram to indicate where they go. There is a legend
on the first page of each diagram, detailing component location. It
refers you to sub-systems, using grid NUMBERS at the top and bottom of
the page and grid LETTERS on each side. This grid system works in a
manner similar to that of a road map.
HOW TO USE THE WIRING DIAGRAMS
1) On the first page of the diagram, you will find a listing
of major electrical components or systems. Locate the specific
component or system you wish to trace. A grid number and letter will
follow the component's name.
2) Use the grid NUMBERS (arranged horizontally across the top\
and bottom of each page) to find the page of the wiring diagram that
contains the component you're seeking. When you reach this page, use
the grid LETTERS on the side of the page to determine the component's
vertical location.
3) Locate the circuit you need to service. The internals are
shown for switches and relays to assist you in understanding how the
circuit operates.
NOTE: In some of the newer wiring diagram articles in this
product, there is a Legend for the wiring diagrams that has
been created to make locating components easier. For these
articles, there will be a COMPONENT LOCATION MENU title in
the article main menu. These articles will also have the
original legend available on the first graphic.

Fig. 1: Identifying Tie-Off Symbols
4) If the wires are not drawn all the way to another
component (across several pages), a reference will tell you their
final destination.
5) Again, use the legend on the first page of the wiring
diagram to determine the grid number and letter of the referenced
component. You can then turn directly to it without tracing wires
across several pages.
6) The symbols shown in Fig. 1 are called tie-offs. The first
tie-off shown indicates that the circuit goes to the temperature
sensor, and is also a ground circuit.
7) The second symbol indicates that the circuit goes to a
battery positive parallel circuit. The third symbol leads to a
particular component and the location is also given.
8) The lines shown in Fig. 2 are called options. Which path
or option to take depends on what engine or systems the vehicle has.

Voilet ................. VIO ................... VI
White .................. WHT ................... WT
Yellow ................. YEL ................... YL









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WIRING DIAGRAM SYMBOL IDENTIFICATION
NOTE: Standard wiring symbols are used on diagrams. The list below
will help clarify any symbols that are not easily understood
at a glance. Most components are labeled "Motor", "Switch" or
"Relay" in addition to being drawn with the standard symbol.
WIRING DIAGRAM SYMBOLS
Views of the symbols used in the WIRING DIAGRAM articles are
in the following graphics. See Figs. 3 through 25.
Fig. 3: Circuit Breaker
Fig. 4: Coil (Internal)
Fig. 5: Connector
Fig. 6: Diode (In-Line)
Fig. 7: Diode (Internal)

WIR IN G D IA G RAM S

1988 J e ep C hero ke e
1988 Wiring Diagrams
Jeep
Cherokee & Wagoneer
IDENTIFICATION
COMPONENT LOCATION MENU
COMPONENT LOCATIONS TABLE








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Component Figure No. (Location)
A/C & Htr Systems ............................... 5 (A-D 16-19)
Alternator ............................................ 1 (C 3)
Audio Alarm Module ................................... 7 (D 27)
Back-Up Lt Sw (M/T) .................................. 4 (D 12)
Battery ............................................... 1 (A 2)
Beam Sel Sw .......................................... 6 (E 23)
Brake Warning Sw ..................................... 6 (C 20)
Clock ................................................ 7 (E 27)
Clutch Switch ........................................ 4 (E 15)
Courtesy Lights ................................... 7 (C 24-26)
Cruise Ctrl Sys ................................... 4 (E 12-15)
Diag Conn D1 (2.5L) ................................... 3 (B 9)
Diag Conn D1 (4.0L) ................................... 2 (B 4)
Diag Conn D2 (2.5L) .................................. 3 (B 11)
Diag Conn D2 (4.0L) ................................... 2 (B 7)
DIR Hazard Sw ................................... 6 (D-E 20-21)
Door Switches ........................................ 7 (C 27)
Elect Ctrl Unit (2.5L) ............................. 3 (A 9-10)
Elect Ctrl Unit (4.0L) .............................. 2 (A 4-7)
Engine Compartment Lt ................................. 1 (C 1)
Fog Light Relay ....................................... 1 (D 2)
Fog Light Sw ...................................... 6 (E 21-22)
Fuel Pump Rly (2.5L) .................................. 3 (C 9)
Fuel Pump Rly (4.0L) ................................ 2 (E 5-6)
Fuel Tank Unit ....................................... 6 (B 20)
Fus Links ........................................... 1 (B 2-3)
Fuse Block ...................................... 4 (B-D 12-15)
4WD Switch ..................................... 6 (C 20, D 21)
Gear Sel Sw .......................................... 5 (C 16)
Glove Box Light ...................................... 7 (C 25)
Headlight Delay Module ............................... 6 (E 23)
Headlight Switch .................................. 6 (D 22-23)
Horn Relay ............................................ 1 (C 2)
Ignition Ctrl Mod (2.5L) ............................ 3 (B-C 8)
Ignition Ctrl Module (4.0L) ........................... 2 (E 4)
Ignition Key Warn Sw ................................. 7 (D 26)
Ignition Switch ................................... 4 (A 12-15)
Illum Lights .................................... 7 (C-D 24-25)
Instrument Cluster .............................. 6 (A-C 22-23)
Keyless Entry Module .............................. 7 (B 24-25)
Latch Rly (B+) (4.0L) ............................... 2 (B-C 4)
Power Antenna Rly .................................. 7 (D-E 27)
Power/Comfort Sw ..................................... 5 (D 19)
Power Door Lock Sys ............................. 7 (A-C 24-27)
Power Mirror Sw ................................. 7 (D-E 24-25)
Power Seat Sw ................................... 8 (A-B 28-29)

Power Window Sys ................................ 7 (A-C 24-27)
Radiator Fan Rly (4.0L) ............................. 1 (C 1-2)
Radiator Fan Diode Assy ............................... 1 (C 3)
Radiator Temp Switch .................................. 1 (C 3)
Rear Defogger Unit ................................ 8 (D 28-29)
Rear Wiper/Washer Unit .......................... 8 (B-C 29-30)
Resistor Pack ........................................ 6 (E 21)
Rt Fnt Door Lock/Window Switch .................... 7 (B 26-27)
Starter Solenoid .................................... 1 (A 2-3)
Starter Solenoid Relay ................................ 1 (A 2)
Stop Light Switch .................................... 4 (E 15)
Trailer Towing Harness (Cherokee) ................. 8 (E 28-31)
Trailer Towing Harness (Wagoneer) ................. 8 (A 28-31)
Trans Ctrl Unit ................................. 5 (D-E 16-19)
Upshift Sw (2.5L) .................................... 6 (C 21)
Vanity Lights ........................................ 7 (C 24)
Washer Fluid Level Sw ................................ 3 (D 11)
Wiper/Washer System .............................. 3 (D-E 8-11)









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WIRING DIAGRAMS