key ISUZU TROOPER 1995 Workshop Manual

DIAGNOSIS
DIAGNOSIS PROCEDURE
.......,. 1. Check to see ifthe battery voltage is normal.
2. Check to see if the fuse is normal.
CHASSIS ELECTRICAL 8 -275
3. Replace the anti-theft controller with one reserved for test. If a trouble recurs even after replacing the
controller, find
out the cause of the trouble by referring to "System check procedure" and the following list.
Item Malfunction
Possible
cause Detecting method Remarks
Defective
contact of door switch,
With door open, dome light and Burnt
out indicator
ANTI-THEFT or open circuit in door switch courtesy light do not come on. light bulb possible.
indicator light wiring.
A does
not flash Short circuit in the detect switch.
Check controller connector. Refer to "Connector check procedure" in
this system.
Engine hood, doors and
tailgate Check to see if doors are closed are not fully closed and locked. and locked.
Defective door switch, or short Dome light and courtesy light circuit in switch wiring.
remain lit on after closing doors.
Indicator light Defective tamper switch, or short Check controller connector. Refer
to "Connector
does not circuit in wiring. check procedure" in
change to
fully this system.
B
ON condition, Defective lock switch, or short Check controller connector. Refer
to "Connector or does not come on at all circuit in wiring. check procedure" in
this system.
Defective engine hood switch, or Check
controller connector. Refer
to "Connector
short circuit in wiring. check
procedure" in
this system.
Defective
tailgate switch, or short Luggage room light remains lit circuit in wiring. after closing tailgate.
ANTI-THEFT
Defective controller.
c indicator light
does not turn off.(Steadily on) Poor contact
of lock switch, or Check alarm operation (See
When
door is open
circuit in wiring. No. 46 of "System
check procedure," possible cause
opened by
is a poor contact of lock switch or D pulling up
a open circuit in wiring. locking knob, alarm does not Broken wire in wiring to headlight Check to see if headlights go Refer
to "Connector operate
and horn, or a blown fuse. out. check procedure" in
Check
controller connector. this
system.
Alarm does not Defective contact of detect switch, Check controller connector.
Refer to "Connector
E
stop. or damaged switch wiring. check procedure" in
this system.
Even when
door Defective contact of detect switch, Check controller connector. Refer
to "Connector
unlocked
or damaged switch wiring. check procedure" in
F
with key, alarm this system.
operates. Door detect switch is
assembled When key is turned to lock posi-
to
wrong door. tion, alarm stops.

8-276 CHASSIS ELECTRICAL
Item Malfunction
Possible cause
Detecting method Remarks
Alarm
does not
Defective contact of tailgate switch When luggage room light switch
G operate even or defective wiring. is turned on with tailgate open, with tailgate
luggage room light does not open
come on.
Even when
Defective contact
of tailgate detect Check controller connector. Refer to "Connector tailgate is open-
switch, or damaged wiring.
check procedure" in H ed with key, this system.
alarm does not
stop.
Even when en-
Damaged engine hood switch or gine hood is wiring.
opened with
I remote release,
alarm does not
operate
Even when
Defective contact
of starter switch. With starter switch turned to
J starter switch is II ACC" position, audio, cigarette
turned, alarm
lighter and door mirrors (on
does not stop
II ACC" circuit) do not operate.
Damaged
door switch, or a short After closing door, dome light
circuit in wiring. and courtesy light remain on.
K Indicator light
continues Damaged tamper switch, or a
Check controller connector. Refer to "Connector flashing
short circuit in wiring. check
procedure" in
this system.
..

------------- -
CHASSIS ELECTRICAL 8-279
Step Operation Item to be checked Item of Remarks
malfunction
34 Close right rear door.
Insert key into key cylinder of right
Check to see if indicator light stays 35 front door and turn it in lock on steadily. B direction.
36 Wait about 10 seconds. Check
to see if indicator light goes c Activate alarm device. off after about 10 seconds.
37 Unlock right front door with lock-Check to see if alarm operates. D Only right front door ing knob.
is unlocked.
Insert
key into key cylinder of right With
key at unlock
position, check to see 38 front door and turn it in unlock Check to see if alarm stops E if alarm stops. (With
direction.
all doors unlocked.)
Check to see if indicator light flashes.
39 Open right front door.
A
Check to
see if dome light and
courtesy light come on.
40 Close right front door.
Check to
see if indicator light stays 41 Lock right front door with key.
on steadily. B
42 Wait about 10 seconds. Check
to see if indicator light goes c Activate alarm device. off after about 10 seconds.
43 Unlock right front door with key. Check
to see if alarm does not F operate.
Check to
see if indicator light stays 44 Lock right front door with key.
on steadily. B
45 Wait about 10 seconds. Check
to see if indicator light goes c Activate alarm device. off after about 10 seconds.
46 Open engine hood with engine
Check to see if alarm operates. I hood release handle.
47 Insert key into starter switch and
Check to see if alarm stops. J turn it to "ACC" position.
NOTE: When the connector of the anti-theft controller is disconnected, the starter is inoperative.
In the checking of short wheel base model, Step Nos. 16 through 21 and Step Nos. 31 through 36
are omitted.

8-280 CHASSIS ELECTRICAL
Connector Checking Procedure
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Terminal
Connection Check Operation Circuit
Remarks
No.
condition
1 Door switch Continuity Open door Continuity Ground
( FRT-LH & RH) RR-LH & RH Close door No Continuity Tailgate
2 Tamper switch
Continuity
-No Continuity If continuity to
ground -no good
3 -
-I - -
4 ---
-
5 ----
6 Engine hood switch Continuity Open engine hood Continuity Ground
Close engine hood
No Continuity
7 Starter switch
"ACC" Voltage Starter
switch "OFF" ov
position
position
Starter switch
"ACC" 12V Satisfactory if
or "ON" position 10V and over
8 Battery(+)
Voltage -12V Satisfactory if
10V and over
9 Door lock switch Continuity Unlock with locking Continuity Ground
( FRT-LH & RH) knob
RR-LH & RH Lock with locking No Continuity
Tailgate knob
10 Detect switch Continuity Unlock with key Continuity Ground
(
FRT-LH & RH )
Tailgate Lock
with key No Continuity
Fig. 8-319
..

CHASSIS ELECTRICAL 8 ~ 277
SYSTEM CHECK PROCEDURE
Step Operation Item to be checked Item of Remarks malfunction
1
Turn starter key to "ON" position. Check to see if engine hood, tail-
gate and doors are closed and
2
Open windows fully. locked.
3
Pull out starter key after turning it Check to see if indicator light K back to "OFF" position.
remains lit off.
4 Unlock
left
front door with locking
knob.
Check to see if indicator light
Open left front door. (And get out flashes.
5 A
of the vehicle.) Check to see if dome light and
courtesy light illuminate.
6 Close left front door.
Check to see if indicator light Be sure to lock door
7
Lock left front door.
changes from flashing to steadily B with locking knob.
on.
8 Wait about 10 seconds. Check to see if indicator light turns c Activate alarm device. off in about 10 seconds.
Unlock left
front door with locking Check to see if alarm operates All doors are unlock-9 knob. (with
headlight flashing, and horn D ed.
blaring intermittently).
Insert key into key cylinder of left With
key set at unlock
10 front door and turn it in unlock Check to see if alarm stops. E position, check to see
direction. if alarm stops.
11 Lock left front door. Check to see if indicator light turns
B All doors are locked.
on.
12 Wait for about 10 seconds. Check to see if indicator light goes c Activate alarm device. off after about 10 seconds.
13 Unlock left front door with key. Check to see if alarm does not F
operate.
14 Lock left front door with key. Check to see if indicator light turns
B
on.
15 Wait for about 10 seconds. Check to see if indicator light goes c Activate alarm device. off after about 10 seconds.
16 Unlock left rear door with locking Check to see if alarm starts. D Only left rear door is
knob. unlocked
Insert key
into key cylinder of left With
key set at unlock
position, check to see 17 front door and turn it to unlock Check to see if alarm stops. E if alarm stops. (All direction.
doors are unlocked.)

8-278 CHASSIS ELECTRICAL
Step Operation Item to be checked Item of Remarks malfunction
Check to see if indicator light flashes.
18 Open left rear door.
A
Check to see if dome light and
courtesy light come on.
19 With one person in vehicle, close
left rear door.
20 Lock left front door with locking Check to see if indicator light B All doors are locked.
knob. is steadily on.
21 Wait about 10 seconds. Check to see if indicator light turns c Activate alarm device. off in about 10 seconds.
22 Unlock tailgate from inside with Check to see if alarm operates. D Only tailgate is un-
locking knob.
locked
Open tailgate, insert key into key With key set at unlock 23 cylinder of tailgate and turn it in Check to see if alarm stops. H position,
check to see
lock direction. if alarm stops.
Check to see if indicator light A
flashes.
24 Leave tailgate open.
Check to see if luggage room light G on.
25 Close tailgate
Insert key into tailgate key cylinder Check to see if indicator light 26 and turn it in lock direction. changes
over from flashing into B lighting condition.
27 Wait about 10 seconds. Check to see if indicator light goes c Activate alarm device. off after about 10 seconds.
28 Unlock tailgate with key. Check to see if alarm does not F operate.
29 Lock tailgate with key. Check to see if indicator light come B on.
30 Wait about 10 seconds. Check to see if indicator light goes c Activate alarm device. off after about 10 seconds.
31 Unlock right rear door with locking Check to see if alarm operates.
D Only right rear door knob.
is unlocked.
Insert key into key cylinder of right With
key at unlock
position, check to see 32 front door and turn it in unlock Check to see if alarm stops E if alarm stops. (With
direction.
all doors unlocked.)
Check to see if indicator light flashes.
33 Open right rear door.
A Check to see if dome light and
courtesy light come on.
..

8-282 CHASSIS ELECTRICAL
ENGINE HOOD SWITCH
~ INSPECTION
Check the continuity between the switch terminal and
the body. (Fig. 8-320)
~ Switch side
~· Sw
Push
Release
Fig.
8-320
E) REMOVAL (FIG. 8-321)
Switch 1 body
Preparation: Disconnect the battery ground cable.
Q...,..,...___ 1. Cap
~Locknut
Fig. 8-321
1. Cap
2. Engine hood switch
• Remove the lock nut
• Disconnect the connector
B INSTALLATION
To install, follow the removal steps in the reverse
order.
KEY SWITCH (FRONT DOOR-LH AND
RH, TAILGATE) ...
~ INSPECTION (DETECT SWITCH)
Check the continuity between the connector termi­
nals. (Fig. 8-322)
Switch side
~· K y p 1 3
Lock 0 {)
Unlock
Fig. 8-322
~ INSPECTION (TAMPER SWITCH)
Check the continuity between the connector
terminals. (Fig. 8-323)
• Switch side
~· Sw 2 4
Push
Release
Fig. 8-323
B REMOVAL AND INSTALLATION
r::J Refer to Section 10 "BODY" for outside handle
c:.:J and door lock cylinder removal and installation
steps

98-28 CRUISE CONTROL
ON-VEHICLE SERVICE
IE BRAKE SWITCH ADJUSTMENT
(FIG. 9B-5)
0.5 -1.0 mm (0.02 -0.04 in.}
Fig. 98-5
1. Check to be sure that the brake pedal has been
completely returned by the return spring.
2. Disconnect the switch connector.
3. Loosen the lock nut of the switch.
4. Turn the switch clockwise until the tip of screw
portion of the brake pedal hits the pedal arm.
5. Turn the switch counterclockwise until the clear­
ance between the
tip of the screw portion and the
pedal arm becomes 0.5
to 1.0mm (0.02-0.04 in).
6. Tighten the lock nut.
7. Connect the switch connector.
IE CLUTCH SWITCH ADJUSTMENT
(FIG. 9B-6)
Clutch switch
--Clutch pedal
Fig. 98-6
1. Check to be sure that the clutch pedal has been
completely returned by
the return spring.
2. Disconnect the switch connector.
3. Loosen the lock nut of the switch.
4. Push the switch by hand until the push rod cannot
be seen from the tip portion of the switch.
5. Give the switch one reverse rotation.
6. Tighten the lock nut.
7. Connect the switch connector.
IE ACTUATOR CABLE ADJUSTMENT
(FIG. 9B-7)
Actuator
Adjust nut A
Adjust nut B
Fig. 98-7
1. Fix the accelerator pedal at the position where it
has been fully returned (with the throttle valve
fully closed).
2. Loosen the adjust nuts A and B.
3. With the outer cable pulled to the accelerator
pedal side (in the state
where the inner cable has
no play),
tighten the adjust nut A by hand until it
hits the bracket.
4. Tighten the adjust nut 8 to lock it.
STARTER SWITCH (FIG. 98-8)
Fig. 98-8
The starter switch is provided
with following switch
positions:
LOCK, OFF, ACC, ON, and START. Turning
the starter key to these positions completes a circuit
in
order to start and shut off the engine, and operate
the accessories.

~ INSPECTION
I B-111
~
4 1
(82)
IACCI
LOCK Removed
OFF
ACC Inserted
ON -
START
Fig. 98-9
I t!l Check the continuity between the starter switch
connector
terminals. (fig. 98-9)
Replace the starter switch when the result of
inspection is found abnormal.
B REMOVAL (FIG. 98-10)
Preparation: Disconnect the battery ground cable.
5 3
IIG2) 1ST)
CRUISE CONTROL 98-29
2 7
(81) IIG1)
Fig. 98-10
8 6
IKEY(j;)) IKEY81
o----o
5. Starter switch
I
I
1. Front console I assembly

9J-6 Supplemental Restraint System <
COMPONENT DESCRIPTION
DERM
CAUTION: DO NOT OPEN THE DERM CASE FOR
ANY REASON. TOUCHING THE CONNECTOR PINS
OR SOLDERED COMPONENTS MAY CAUSE
ELECTROSTATIC DISCHARGE DAMAGE. REPAIR
OF A MALFUNCTIONING DERM IS BY
REPLACEMENT ONLY.
The DERM is designed to perform the following functions
in the SRS:
1. Energy Reserve- The DERM maintains two 36-Volt
Loop Reserve(36VLR) energy supplies to provide
deployment energy when the vehicle voltage is low
or lost in a frontal crash.
2. Malfunction Detection-The DERM performs
diagnostic monitoring of SRS electrical components.
3. Malfunction Recording- The DERM provides SRS
diagnostic trouble code information through a scan
tool.
4. Driver Notification- The DERM warns the vehicle
driver of SRS malfunctions by controlling the "AIR
BAG"
warning lamp.
5. Frontal Crash Recording- The DERM records the
SRS status during a frontal crash.
The DERM is connected to the
SRS wiring harness by
a
24-way connector. This harness connector uses a
shorting
clip across certain terminals in the contact area.
This shorting
clip connects the "AIR BAG" warning lamp
to ground when the DERM harness connector is
disconnected. This will cause the "AIR BAG" warning
lamp to come "ON" steady whenever the ignition switch
is at the RUN,BULB
TEST or START positions with the
DERM disconnected.
"AIR BAG"WARNING LAMP
Ignition voltage is applied to the "AIR BAG" warning lamp
when the ignition switch is at the RUN,BULB TEST or
START positions. The DERM controls the lamp by
providing ground with a
lamp driver. The "AIR BAG"
warning lamp is used in the SRS to do the following:
1. Verify lamp and DERM operation by flashing SEVEN
times when the ignition switch is first turned"ON".
2. Warn the vehicle driver of SRS electrical system
malfunctions which could potentially affect the
operation of the
SRS. These malfunctions could
result
in non-deployment in case of a frontal crash
or deployment for conditions less severe than
intended.
The "AIR BAG" warning lamp is the key to driver
notification of SRS malfunctions. For proper lamp
operation, refer to the "SRS Diagnostic System Check"
in this section.
DUAL POLE ARMING SENSOR ~
The dual pole arming sensor is a protective switch
located in the high side(power side) of the deployment
loops.
The dual pole arming sensor is calibrated to close
at low level velocity changes(lower than the
discriminating sensors).
This ensures that the
inflator modules are connected
directly to the "36 VLR" outputs of the DERM or "Ignition
1" voltage
when any discriminating sensor closes.
The dual pole arming sensor consists of: a sensing
element, two sets of normally open switch contacts,
diagnostic resistors and diodes. The sensing
element
closes
both sets of switch contacts when the velocity of
the
vehicle changes at a rate indicating a potential need
for
deployment.
Two of the diagnostic resistors are connected in parallel
with the switch contacts. This allows a small amount of
current to
flow through each of the deployment loops
during normal, non-deployment operation. This current
flow results in voltage drops across each component in
the
deployment loops. The DERM monitor these voltage
drops to detect circuit or component malfunctions. There
are two
additional diagnostic resistors within the dual
pole
arming sensor which allow the DERM to monitor the
voltage supplied to the high side ofthe deployment loops.
These monitored voltages are used by the diagnostic
logic of the DERM to make a more precise determination
of the
actual deployment loop malfunction. ~
The diodes within the dual pole arming sensor provide
isolation between the "36VLR" outputs of the DERM and
the
vehicle electrical system "Ignition 1" voltage. The
presence of the diodes prevents a direct continuity
measurement through the
dual pole arming sensor
resistors to
terminals"3","4" or "5".
DISCRIMINATING SENSORS
The discriminating sensors are protective switches wired
in parallel on the low side(ground side) of the deployment
loops.
These sensors are calibrated to close with velocity
changes which are severe enough to warrant
deployment.
The discriminating sensors consist of a sensing element
and normally open switch contacts when the vehicle
velocity changes are severe enough to warrant
deployment.
A diagnostic resistor is connected in parallel with the
switch contacts within the
LH forward discriminating
sensor and
RH forward discriminating sensor. These
parallel resistors supply the ground path for the current
passing through the
deployment loops during normal,
non-deployment operation. This current flow results in
voltage drops across each component within the
deployment loops. The DERM monitors these voltage
drops to detect circuit or component malfunctions.
II