ISUZU KB P190 2007 Workshop Repair Manual

ELECTRICAL-BODY AND CHASSIS 8A-3
PAGE
Power Window ............................................................................................................8A- 41 5
Audio, Clock and Cigarette Lighter ...........................................................................8A- 440
Power Door Mirror ......................................................................................................8A- 464
Rear Defogger .............................................................................................................8A- 480
Supplemental Restraint System (SRS)-Air Bag ........................................................8A- 491
Transfer Case Control Module ...................................................................................8A- 498
Anti-Lock Brake System .............................................................................................8A- 514
Immobilizer ..................................................................................................................8 A- 519
Keyless Entry ..............................................................................................................8A- 529
Data Link Connector ...................................................................................................8A- 553
Anti Theft ..................................................................................................................... .8A- 561
Key Inter Lock .............................................................................................................8A- 588
DRM ........................................................................................................................... ...8A- 592
Trailer Hitch ................................................................................................................. 8A- 595
Power Train Interface Module (PIM) ..........................................................................8A- 600
Connector List ................................................................................................................ .8A- 606

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ISUZU KB P190 2007

8A-4 ELECTRICAL-BODY AND CHASSIS
GENERAL INFORMATION
The body and chassis electrical system operates on a twelve volt power supply with negative ground polarity.
The main harness consists of the engine harness, the instrument harness, the body harness, and the chassis
harness.
The harnesses use a split corrugated tube to protect the wires from the elements.
W ire size is determined by current flow, circuit length, and voltage drop.
All wires have color-coded insulation.
W ire color-codes are shown in the circuit diagrams.
This makes it easier to trace circuits and to make the proper connections.
Each circuit consists of the following:
5. Power source – The battery and the alternator
5. W ires – To carry electrical current through the circuit
5. Fuses – To protect the circuit against current overload
5. Relays – To protect voltage drop between the battery and the circuit parts and to protect the switch points against burning
5. Switches – To open and close the circuit
5. Load – Any device, such as a light or motor, which converts the electrical current into useful work
5. Ground – To allow the current to flow back to the power source


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ELECTRICAL-BODY AND CHASSIS 8A-5
NOTES FOR WORKING ON ELECTRICAL ITEMS
Battery

BATTERY CABLE
Disconnecting the Battery Cable
5. All switches should be “OFF” position.
5. Disconnect the battery ground cable.
5. Disconnect the battery positive cable.
CAUTION:
It is important that the battery ground cable be
disconnected first.
Disconnecting the battery positive cable first can result in
a short circuit.














Connecting the Battery Cable
Follow the disconnecting procedure in the reverse order to
connect the battery cables.
CAUTION:
Clean the battery terminal and apply light coat of grease to
prevent terminal corrosion.




CONNECTOR HANDLING
Disconnecting the Connectors
Some connectors have a tang lock to hold the connectors
together during vehicle operation.
Some tang locks are released by pulling them towards you
1.
Other tang locks are released by pressing them forward
2.
Determine which type of tang lock is on the connector being
handled.




Firmly grasp both sides (male and female) of the connector.
Release the tang lock and carefully pull the two halves of the
connector apart.
Never pull on the wires to separate the connectors.
This will result in wire breakage.


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8A-6 ELECTRICAL-BODY AND CHASSIS


Connecting the Connectors
Firmly grasp both sides (male and female) of the connector.
Be sure that the connector pins and pin holes match.
Be sure that both sides of the connector are aligned with each
other.
Firmly but carefully push the two sides of the connector
together until a distinct click is heard.


Connector Inspection
Use a circuit tester to check the connector for continuity.
Insert the test probes from the connector wire side.



CAUTION
Never insert the circuit tester test probes into the
connector open side to test the continuity.
Broken or open connector terminals will result.



Waterproof Connector Inspection
It is not possible to insert the test probes into the connector
wire side of a waterproof connector.
Use one side of a connector
1 with its wires cut to make the
test.
Connect the test connector to the connector
2 to be tested.
Connect the test probes to the cut wires to check the connecto
r
continuity.






Connector Pin Removal
Connector Housing Tang Lock Type
5. Insert a slender shaft 3into the connector housing open
end
4.
5. Push the tang lock
5up (in the direction of the arrow in
the illustration).
Pull the wire
6 with pin 7free from the wire side of the
connector.


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ELECTRICAL-BODY AND CHASSIS 8A-7


Pin Tang Lock Type
5. Insert a slender shaft 3into the connector housing open
end
4.
5. Push the tang lock
8flat (toward the wire side of the
connector).
Pull the wire
6 with pin 7free from the wire side of the
connector.



Connector Pin Insertion
5. Check that the tang lock 8 is fully up.
5. Insert the pin
7 from the connector wire side 9.
Push the pin in until the tang lock closes firmly.
5. Gently pull on the wires
6to make sure that connector pin
is firmly set in place.



Fuse Replacement
The replacement fuse must have the same amperage
specification as the original fuse.
Never replace a burn out fuse with a fuse of a different
amperage specification.
Doing so can result in an electrical fire or other serious circuit
damage.



Parts Handling
Be careful for parts handling and any part should not be
dropped or thrown, otherwise short circuit or disorder may
result.



Wiring Harness
5. W hen assembling the parts, be careful not to bite or wedge
the wiring harness.
5. All electrical connections must be kept clean and tight.


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8A-8 ELECTRICAL-BODY AND CHASSIS


5. Use a grommet or guard tube to protect the wiring harness
from contacting a sharp edge or surface.



5. Position the wiring harness with enough clearance from the
other parts and guard the wiring harness with a vinyl tube
to avoid direct contact.



5. The wiring harness between engine and chassis should be
long enough to prevent chafing or damage due to various
vibrations.


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ELECTRICAL-BODY AND CHASSIS 8A-9
SPLICING WIRE
Open the Harness
If the harness is taped, remove the tape.
To avoid wire insulation damage, use a sewing “seam ripper”
(available from sewing supply stores) to cut open the harness.
If the harness has a black plastic conduit, simply pull out the
desired wire.
Cut the wire
Begin by cutting as little wire off the harness as possible.
You may need the extra length of wire later if you decide to cut
more wire off to change the location of a splice.
You may have to adjust splice locations to make certain that
each splice is at least 1-1/2” (40 mm) away from other splices,
harness branches, or connectors.
Strip the insulation
W hen replacing a wire, use a wire of the same size as the
original wire.
Check the stripped wire for nicks or cut strands.
If the wire is damaged, repeat the procedure on a new section
of wire.
The two stripped wire ends should be equal in length.



Crimp the Wires
Select the proper clip to secure the splice.
To determine the proper clip size for the wire being spliced,
follow the directions included with your clips.
Select the correct anvil on the crimper.
(On most crimpers your choice is limited to either a small or
large anvil.)
Overlap the two stripped wire ends and hold them between
your thumb and forefinger.
Then, enter the splice clip under the stripped wires and hold it
in place.



•
Open the crimping tool to its full width and rest one handle
on a firm flat surface.
• Center the back of the splice clip on the proper anvil and
close the crimping tool to the point where the back of the
splice clip touches the wings of the clip.
• Make sure that the clip and wires are still in the correct
position. Then, apply pressure until the crimping tool closes.



Before crimping the ends of the clip, be sure that:
• The wires extend beyond the clip in each direction.
• No strands of wire are cut loose.
• No insulation is caught under the clip.
Crimp the splice again, once on each end.
Do not let the crimping tool extend beyond the edge of the clip
or you may damage or nick the wires.


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8A-10 ELECTRICAL-BODY AND CHASSIS



Solder
Apply 60/40 rosin core solder to the opening in the back of the
clip.
Follow the manufacturer’s instructions for the solder equipment
you are using.



Tape the Splice
Center and roll the splicing tape.
The tape should cover the entire splice.
Roll on enough tape to duplicate the thickness of the insulation
on the existing wires.
Do not flag the tape.
Flagged tape may not provide enough insulation, and the
flagged ends will tangle with the other wires in the harness.



If the wire does not belong in a conduit or other harness
covering, tape the wire again.
Use a winding motion to cover the first piece of tape.



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ELECTRICAL-BODY AND CHASSIS 8A-11
SYMBOLS AND ABBREVIATIONS
SYMBOLS



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8A-12 ELECTRICAL-BODY AND CHASSIS
ABBREVIATIONS
Abbreviation Meaning of abbreviation Abbreviation Meaning of abbreviation
A Ampere (S) kW Kilowatt
ABS Anti-lock brake system LH Left hand
ASM Assembly LW B Long wheel base
AC Alternating current MPI Multipart fuel injection
A/C Air conditioner M/T Manual transmission
ACC Accessories PA Passenger
CARB Carburetor PIM Power train interface module
C/B Circuit breaker PJT Projector
CKP Crankshaft position QOS Quick On Start system
CSD Cold start device RH Right hand
DIS Direct ignition system RR Rear
DR Driver RW AL Rear wheel anti-lock brake system
DRM Data Recording Module SCV Suction control valve
EHCU Electronic Hydraulic control Unit SRS Supplemental restraint system
ECGI Electronic control gasoline injection ST Start
ECM Engine control module STD Standard
ECU Electronic control unit SW Switch
EFE Early fuel evaporation SW B Short wheel base
EGR Exhaust gas recirculation TCM Transmission control module
2W D Two-wheel drive TCCM Transfer case control module
4W D Four-wheel drive V Volt
FL Fusible link VSV Vacuum switching valve
FRT Front W W att (S)
H/L Headlight W OT W ide open throttle
W/ With HVAC
Heater, Ventilation, and Air
Conditioning W /O W ithout
IC Integrated circuit W /S W eld Splice
IG Ignition


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