1998 SUZUKI GRAND VITARA ignition wiring

YH4
GRAND
VITARA
7B1-36 AUTOMATIC TRANSMISSION (4 A / T)
Switch ON
positionSwitch OFF
positionSwitch ON
position
Switch OFF
position
DIAGNOSTIC FLOW TABLE B-2 ªO / D OFFº LIGHT CIRCUIT CHECK
(ªO / D OFFº LIGHT COMES ON STEADILY)
WIRING DIAGRAM ± Refer to Table B-1 in this section.
TROUBLESHOOTING
STEPACTIONYESNO
1Check O / D cut Switch Position.
Is O / D cut switch turned OFF (Is switch button at OFF
position)?Go to Step 2.Turn O / D cut switch
OFF.
2Check Lamp Circuit for Short.
1) Turn ignition switch OFF and disconnect PCM
connectors.
2) Turn ignition switch ON.
Does ªO / D OFFº lamp come ON steadily?ªW / Bº circuit shorted
to ground.Go to Step 3.
3Check O / D cut Switch Circuit.
1) Check resistance between terminal E61-33
(G16 / J20 engines) or E61-14 (H25 engine) of
disconnected PCM connector and body ground with
O / D cut switch OFF.
Is continuity indicated?Go to Step 4.Check PCM ground
circuit for open.
If ground circuit is
OK, substitute a
known-good PCM
and recheck.
4Check O / D cut Switch for Operation.
1) Remove console box.
2) Disconnect O / D cut switch connector.
3) Check continuity between switch terminals under
each condition below.
Switch OFF position: No continuity
Switch ON position: Continuity
Is check result satisfactory?ªY / Rº circuit shorted
to ground.Replace O / D cut
switch.
Fig. for Step 1. Fig. for Step 4.

YH4
GRAND
VITARA
G16 / J20 Engines
H25 Engine
1. PCM
2. J / B
3. O / D cut switch
4. P / N change switch
5. J / C
1. PCM
2. Fuse
3. O / D cut switch
4. P / N change switch
5. J / C
6. J / C
AUTOMATIC TRANSMISSION (4 A / T) 7B1-37
DIAGNOSTIC FLOW TABLE B-3 ªPOWERº LIGHT CIRCUIT CHECK
(ªPOWERº LIGHT DOESN'T LIGHT AT IGNITION SWITCH ON BUT
ENGINE STARTS UP)
WIRING DIAGRAM
TROUBLESHOOTING
STEPACTIONYESNO
1ªPOWERº light circuit check:
(1) With ignition switch OFF, disconnect
couplers from PCM.
(2) Using service wire, connect E61-21 (G16 /
J20 engines) or E61-10 (H25 engine)
terminal of disconnected PCM coupler and
ground.
Does ªPOWERº light turn ON at ignition switch
ON?Poor E61-21 (G16 / J20
engines) or E61-10 (H25
engine) terminal
connection.
If OK, substitute a known-
good PCM and recheck.Bulb burned out or faulty
ªGr / Blº, ªB / Wº wire.

YH4
GRAND
VITARA
7B1-38 AUTOMATIC TRANSMISSION (4 A / T)
ª5º
ª4º
DIAGNOSTIC FLOW TABLE B-4 ªPOWERº LIGHT CIRCUIT CHECK
(ªPOWERº LIGHT COMES ON STEADILY)
WIRING DIAGRAM ± Refer to Table B-3 in this section.
TROUBLESHOOTING
STEPACTIONYESNO
1Check Power / Normal Change Switch Position.
Is switch button at Normal position?Go to Step 2.Set Power / Normal
change switch at
Normal position.
2Check Lamp Circuit for Short.
1) Turn ignition switch OFF and disconnect PCM
connectors.
2) Turn ignition switch ON.
Does ªPOWERº lamp come ON steadily?ªGr / Blº circuit
shorted to ground.Go to Step 3.
3Check Power / Normal Change Switch Circuit.
1) Check resistance between terminal E61-31
(G16/J20 engines) or E61-9 (H25 engine) of
disconnected PCM connector and body ground with
P / N change switch OFF.
Is continuity indicated?Go to Step 4.Check PCM ground
circuit for open.
If ground circuit is
OK, substitute a
known-good PCM
and recheck.
4Check Power / Normal Change Switch for Operation.
1) Remove Power / Normal change switch.
2) Check continuity between switch terminals ª4º and
ª5º under each condition below.
Normal position: No continuity
Power position: Continuity.
Is check result satisfactory?ªOr / Blº circuit
shorted to ground.Replace Power /
Normal change
switch.
Fig. for Step 1. Fig. for Step 4.

YH4
GRAND
VITARA
G16/J20 Engines H25 Engine
G16/J20 Engines
H25 Engine
1. PCM
2. A / T input speed sensor 11 1 0
Bl / Y Bl / G16 8
Bl / Y Bl / G
7B1-42 AUTOMATIC TRANSMISSION (4 A / T)
DTC P0715 (DTC NO.76) INPUT / TURBINE SPEED SENSOR CIRCUIT MALFUNCTION
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA
Input speed sensor detected speed is lower than spec-
ification while vehicle running under all of the following
conditions:

at higher than 10 km / h (7 mph) with 1st gear in D
range for 1 sec. or more.

at higher than 20 km / h (13 mph) with 2nd gear in D
range for 2 sec. or more.

at higher than 30 km / h (20 mph) with 3rd gear in D
range for 2 sec. or more.
(2 driving cycles detection logic)
Input speed sensor and its circuit

PCM
DTC CONFIRMATION PROCEDURE
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 persons, a driver and a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC.
3) Start engine and turn O / D cut switch ON.
4) Shift select lever to D range and start vehicle.
5) Keep vehicle speed at higher than 10 km / h (7 mph) with 1st gear in D range for 2 sec. or more.
6) Increase vehicle speed and keep it at higher than 20 km / h (13 mph) with 2nd gear in D range for 2 sec. or more.
7) Increase vehicle speed and keep it at higher than 30 km / h (20 mph) with 3rd gear in D range for 2 sec. or more.
8) Stop vehicle.
9) Check DTC and / or pending DTC.

YH4
GRAND
VITARA
G16/J20 Engines H25 Engine
G16/J20 Engines
H25 Engine
1. PCM
2. A / T output speed sensor 23
22
WOr10 9
WOr
7B1-44 AUTOMATIC TRANSMISSION (4 A / T)
DTC P0720 (DTC NO.75) OUTPUT SPEED SENSOR CIRCUIT MALFUNCTION
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA

With 4WD LOW switch OFF, no output speed sensor
signal is inputted while vehicle speed sensor signal
are inputted.
or

With 4WD LOW switch OFF, no output speed sensor
signal is inputted while engine running at higher than
specified engine speed with ªDº range.
(2 driving cycles detection logic)
A / T output speed sensor or its circuit

PCM
DTC CONFIRMATION PROCEDURE
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 persons, a driver and a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC.
3) Start engine and shift transfer lever to ª2Hº or ª4Hº range.
4) Drive vehicle at 40 km / h (25 mph) or more for longer than 10 sec. (or higher than 3500 rpm engine speed with
D range for longer than 10 sec.)
5) Stop vehicle and check DTC and / or pending DTC.

YH4
GRAND
VITARA
G16/J20 Engines H25 Engine
G16/J20 Engines
H25 Engine
1. PCM
2. Shift solenoid-A
3. Shift solenoid-B
4. TCC solenoid
AUTOMATIC TRANSMISSION (4 A / T) 7B1-47
DTC P0743 (DTC NO.65 / 66) TCC (LOCK-UP) SOLENOID ELECTRICAL
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA
Voltage at terminal C51-1-8 for G16 / J20 (C51-1-2 for
H25) of PCM is high while TCC solenoid OFF is com-
manded or low while TCC solenoid ON is comman-
ded.
TCC (lock-up) solenoid valve

TCC (lock-up) solenoid valve circuit

PCM
DTC CONFIRMATION PROCEDURE
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 persons, a driver and a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC.
3) Start engine, warm it up to normal operating temperature and shift transfer lever to ª2Hº or ª4Hº range.
4) Shift selector lever in D range and keep it there for 10 seconds.
5) Increase vehicle speed to about 80 km / h (50 mph) in 4th gear and in D range.
6) Keep driving at above speed for 20 seconds.
7) Release accelerator pedal, decrease vehicle speed and stop vehicle.
8) Check DTC and / or pending DTC.

YH4
GRAND
VITARA
G16 / J20 Engines
H25 Engine
1. PCM
2. 4WD low switch
3. J / C
7B1-52 AUTOMATIC TRANSMISSION (4 A / T)
DTC P1875 4WD LOW SWITCH CIRCUIT MALFUNCTION (if equipped)
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITIONTROUBLE AREA
While driving at higher than specified vehicle speed
and with more than specified throttle valve opening,
the following conditions are satisfied for specified time.

Vehicle speed sensed by vehicle speed sensor is
more than 10 km / h higher than that sensed by A / T
output speed sensor.
(2 driving cycles detection logic)
4WD LOW switch or its circuit

PCM
DTC CONFIRMATION PROCEDURE
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 persons, a driver and a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool.
3) Start engine.
4) Increase vehicle speed to about 30 km/h (19 mph) or more in D range and is in 2H position.
5) Keep driving at above vehicle speed for 30 seconds.
6) Stop vehicle and shift transfer lever to 4L position with A/T selector lever is in P range
7) Increase vehicle speed to about 25 km/h (15 mph) or more in D range and is in 4L position.
8) Keep driving at above vehicle speed for 30 seconds.
9) Stop vehicle and check pending DTC and DTC by using scan tool.

YH4
GRAND
VITARA
8
BODY ELECTRICAL SYSTEM 8-1
SECTION 8
BODY ELECTRICAL SYSTEM
WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System

Service on and around the air bag system components or wiring must be performed only by an autho-
rized SUZUKI dealer. Refer to ªAir Bag System Components and Wiring Location Viewº under ªGener-
al Descriptionº in air bag system section in order to confirm whether you are performing service on
or near the air bag system components or wiring. Please observe all WARNINGS and ªService Precau-
tionsº under ªOn-vehicle Serviceº in air bag system section before performing service on or around
the air bag system components or wiring. Failure to follow WARNINGS could result in unintentional
activation of the system or could render the system inoperative. Either of these two conditions may
result in severe injury.

Technical service work must be started at least 90 seconds after the ignition switch is turned to the
ªLOCKº position and the negative cable is disconnected from the battery. Otherwise, the system may
be activated by reserve energy in the Sensing and Diagnostic Module (SDM).
WIRING SYSTEM
(Harnesses, Connectors, Fuses, Relay, Switches, Grounds, System Circuit Diagram)Section 8A . . . . . . .
LIGHTING SYSTEMSection 8B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTRUMENTATION AND DRIVER INFORMATIONSection 8C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WINDOWS, MIRRORS, SECURITY AND LOCKSSection 8D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IMMOBILIZER CONTROL SYSTEMSection 8F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTENTS
GENERAL DESCRIPTION8-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cautions in Servicing8-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols and Marks8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abbreviations8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Color Symbols8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Joint Connector8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Box and Relay8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Diagram8-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .