1995 ISUZU TROOPER Workshop Manual

CHASSIS ELECTRICAL 8-379
2. SEAT HEATER ON THE DRIVER (OR PASSENGER)
SIDE DOES NOT HEAT UP
• DISCONNECT THE SEAT HEATER SWITCH CONNECTOR
• TURN THE STARTER SWITCH uoN"
• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE SEAT HEATER SW HARNESS SIDE CONNECTOR 2 IB-291 (OR
2 I B-311 ) AND THE GROUND?
I
YES
I NO I
1
• IS THE SEAT HEATER sw FUNCTION NORMAL? I REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN OPEN CIRCUIT
IN
THE CIRCUIT
I
YES
I NO l
I
• DISCONNECT THE HEAT UNIT CONNECTOR REPLACE THE SEAT HEATER SW I
• IS THERE ANY CONTINUITY BETWEEN THE HEAT UNIT
CONNECTOR 11 T-a I. 31 T-al AND 41 T-ai(OR 1 IT-101.
3 IT-101 AND 4IT-10I )
l
YES I NO l
I
REPAIR
A POOR CONNECTION AT CONNECTORS OR AN REPLACE THE HEAT UNIT l
OPEN CIRCUIT BETWEEN 1 IB-291 AND 31 T-al. 4 IB-291
AND 1l T-al. 41 T-al-GROUND (OR 1 I B-311 AND 3 IT-1ol •
4 I B-311 AND 1 IT-101 • 41 T-101 AND GROUND)
3. HEAT (OR KEEP) POSITION DOES NOT HEAT UP
• IS THE SEAT HEATER SW FUNCTION NORMAL?

8-380 CHASSIS ELECTRICAL
STARTER SWITCH
Refer to "START AND CHARGING" in this section.
SEAT HEATER SWITCH
~ INSPECTION
Check the continuity between terminals of the seat
heater switch. (Fig. 8-432)
Repair
or replace the switch when the result of
inspection is found abnormal.
I B-291 I B-31 I
ji
8
s ~0. 1 2 3 4
HEAT o--:---0= f--0
o-6--0
o---0---j-0 KEEP o-6--0
Fig. 8-432
B REMOVAL (FIG. 8-433)
Preparation: Disconnect the battery ground cable.
1. Front console assembly
• Refer to the FRONT CONSOLE ASSEMBLY in
Section 10 BODY.
2. Seat heater switch
• To release the lock, pushing the switch locks
from the back side of the front console as­
sembly. (Fig. 8-433) Fig.
8-433
B INSTALLATION
To install, follow the removal steps in the reverse
order, noting the
following point.
1. Push the switch with your fingers until it locks
securely.
HEAT UNIT
The heat unit which is incorporated in the both cush­
ion and seat back side. The circuit breaker is also
incorporated in the element to prevent the overheat ~
of the heater. (Fig. 8-434)
Heat unit
(Seat back side)
Heat
unit (Seat cushion side)
Fig. 8-434
~ INSPECTION
Check the continuity between the connector
terminals. (Fig. 8-435)
..

Replace the heat unit when the result of inspection is
found abnormal.
~
•
Unit
side
~· Sw
Heat
Keep
Fig. 8-435
1
,.....
o-
Unit
side
3
,.....
4
,.....
---o--o
B REMOVAL AND INSTALLATION (FIG. 8-
B 436, 8-437)
Referto "SEAT HEATER" of Section 10 "BODY".
Heat unit
!Seat back side)
Fig. 8-436
Heat unit (Seat cushion side)
Fig. 8-437
CHASSIS ELECTRICAL 8-381

8-382 CHASSIS ELECTRICAL
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)-AIR BAG
The system consists of the starter switch, Diagnostic Energy Reserve Module (OERM), dual pole arming
sensor,
SRS coil assembly, inflator module (driver & passenger), forward sensor and warning light.
SRS is mainly comprised of the deployment loop and the DERM.
The main function of the deployment loop is to flow current into the inflator modules inside the steering
wheel (driver side) and the passenger side instrument panel (passenger side) to inflate the air bag. The
forward sensor
(LH and /or RH) gets activated by a shock caused by collision during running of a vehicle, the
current
from the battery flows into the inflator modules through dual pole arming sensor, so that the air bag
is
inflated.
The DERM supplies the current to the deployment loop to ensure that the air bag is inflated, if the power
circuit between battery and deployment loop is cut off by the shock of collision.
In
addition, the DERM monitors a voltage drops between components, and if the voltage drops below the
specified
value, the driver is alerted by the "AIR BAG" warning light in meter assembly.
Refer to Section 9J "SUPPLEMENTAL RESTRAINT SYSTEM (SRS)-AIR BAG" for details.
OPERATION OF THE CIRCUIT
DRIVER
INFLATOR MODULE
FOWARD
SENSOR-LH
D
D
STARTER SW
D
1
DUAL POLE ARMING SENSOR
PASSENGER
INFLATOR
MODULE
FORWARD
SENSOR-RH
NOTE: Arrow marks "c::::>" indicate the direction of current
Fig. 8-438
•

(
PASSENGER
INFLATOR
MODULE
H-14
RELAY
& FUSE
BOX
H-50
(Fl-l,FL-21
"T1 ce·
BATTERY
00 I .J>. ~
C-49
FORWARD
SENSOR
(RHI
FORWARD
SENSOR
(LHI
(
(
SRS
COIL
ASSEMBLY
DRIVER
INFLATOR
MODULE
FUSE
BOX
(C-1,C-21,C-22,C-23,C-241
C-48
CONDENSOR
!NCI
;g ~ r-0 0 ~ -0 2
0 ::t ):lo en
en c;; m r­m 0 -t :a ~ r-eo I w co w

8-384 CHASSIS ELECTRICAL
CIRCUIT DIAGRAM
BODY ENG. FRAME
• Terminals marked with a star(*) are gold plated.
• J/C ; Joint Connector
fi "' 6 ;:-~ ~t; ~ >-t;: ~g " "' u"' ::: .. -~ 0 ,. .. ~: zw _w
"" 0" w., .. t. i:: =:: !(o frl@. ~g cl;
0.15R
~ ~ :e 0
0 ~
~
DUAL POLE ARMING SENSOR
~ " ~
@2)JtC·1
~J/C-2
3W/G
.. "' 0
ID "' 0
C-1 10A STARTER RELAY
BODY-FRT ~~~----------------------------------~~----~----------------------------~--------~
BODY-FRT 11~------------------------------------------------------------------------------------------__J
Fig. 8-440
H-..
•