ISUZU TROOPER 1995 Workshop Manual

CHASSIS ELECTRICAL 8-91
MEMO

I
8 -92 CHASSIS ELECTRICAL I
STOPLIGHT AND REAR DEFOGGER I
GENERAL DESCRIPTION i .-_
The circuit consists of the stoplight, stoplight switch (vehicles w/o cruise control), brake switch (ve~icles w/
cruise control), rear defogger, rear defogger switch, rear defogger relay and trailer harness conn~ctor for
stoplights. i
With the brake pedal depressed, the stoplight switch or the brake switch is turned on to illumi~ate the
stoplight. The brake switch controls not only the operation of the stoplight but also the input of th~ cruise
cancel signals to the cruise control unit. 1
When the rear defogger switch is turned on with the starter switch on, the battery voltage is applie to the
rear
defogger through the rear defogger relay to operate the rear defogger.
The rear
defogger switch is provided with a timer. When the operation time of the timer elapses w ich has
been set in advance at manufacture,
the switch is automatically turned off. (The timer operating time is
normally about 30 minutes).
OPERATION OF THE REAR DEFOGGER CIRCUIT
STARTER SW ..------,
BATTERY(+)
~----------------0
llJ,
f-®-
RR DEFOGGER
~
SW
~
>'f RR DEFOGGER ~~
RELAY "ON" :4r 2 1-
(When RR ?
defogger SW HON"I
~ [b
RR DEFOGGER
NOTE: Arrow marks II => II indicate the direction of current
Fig. 8-115
~
•

"T1 tO. 00 I _. ... 0>
(
H-7 H-25
,,
B-11
BRAKE
SW
(W/CRUISE
CONTROL)
STOPLIGHT
SW
(W/0
CRUISE
CONTROL) BATTERY
B-38
-
'I ,....., , lUI,).,.
FUSE
sox~
!C-4,
C-14,
C-17l
/
H-44
(
,RELAY
AND
FUSE
BOX
IFL-1,
FL-21
/
~----._
HIGH
MOUNT
STOPLIGHT
~-----
~
G-,~,
~-~------

-~,

I
"~
'

RRDEFOGGER
STOPLIGHT
(LHI
{RR
COMBINATION
LIGHT)
STOPLIGHT
(RHI
(RR
COMBINATION
LIGHT)
(
;g ::xJ ~ r-0 (') ~ -0 2
(') ::t l> en
en en m r­m ~ ::Jl ~ Cl) I CD w

Jl
::!! co (X) I .....
..... ....,
l'l ~ .... J::
.. .. .. .. l'l ~ ~
28 28
STOP LIGHT •
LH
STOP
LIGHT·
RH
TRAILER HARNESS
CONNECTOR
(STOPLIGHT)
RWAL CONTROU.ER(B)
(TO PAGE 8-188)
·-----m:----1
E8CM(25)
(TO
PAGE
8-194)
0.85 G I y I CRUISE CONTROL
UNIT(12) ITO PAGE
8-174)
SHIFT LOCK
CONTROLLER 121
(TO
PAGE
8-202)
0
I
I
1.258
~~~~
r:u
0~~:~------
I
·-
38
1.25
8
0.5 8
0.501L
0.85
GIY :;: 0
I ' IO ... , .. '" ·-
0
•<
~
:
" <
STOPUGHTSW (W/0
CRUISE CONTROL) II
I
I II
8RAKESW
(WI
CRUISE CONTROL) ,, :»m or;;: Ill< o·· " " m ,
I
1-11
0.85GIW 3LIO
'
' •o :m :~ :~
0.5LIW
8
.
ill
-
.. m < .. mm ~ liJ
Ill <::::
-w
I b
[;Jm
I[;Jn ~ § .., :::
5W
"' ~
.. " ..,
II
0.5LIW
•
0.5LIW
11'."1
0.5LIW
I
0.5L/W
b •
Ill -
)
ILLUMINATION CONTROLLER(3) (TO PAGE 8-79)
0.3RIG
RELAY;TAIL(4)
(TO
PAGE 8-78)
)
+ .. .. ,
)
0 -:::0 0 c =i c i> G) :::0 )> s:
00 I CD ""' 0 :I: )> CJ)
CJ) (i) m r­m 0 -i :c 0 )> r-

"-""
CONNECTOR LIST
elm 8
~
~
I B-111
I H-32IIGRADE Sl
I B-131 I B-141
am I
Fig. 8·118
CHASSIS ELECTRICAL 8-95
I B-191@]
o£J
~
~
I B-381
8±8 4

8-96 CHASSIS ELECTRICAL
DIAGNOSIS
QUICK CHART FOR CHECK POINTS
1. Stoplight
~
Fuse Stoplight SW Stoplight c~ ble
C-14 (15A) or brake SW bulb har
ness
Tr
1-1 Both stoplights inoperative 0 0 p
(1) (3) (~)
1-2 Stoplight on the left (or right) side inoperative 0 )
(1) (2)
1-3 High mount stoplight inoperative )
( 1)
NOTE: Figure in parenthesis"( )" indicates the order of inspection.
2. Rear defogger
~·
Fuse
Rear Rear ~able C-4
C-17 defogger defogger Rear
Tr
(10A) (25A) sw relay defogger
harness
2-1 Rear defogger does not operate 0 0 0 0 0
0 ( 1) (2) (4) (3) (5) (6)
2-2 Rear
defogger timer does not function 0 (1)
NOTE: Figure in parenthesis"( )" indicates the order of inspection.
•

CHASSIS ELECTRICAL 8 -97
1-1 BOTH STOPLIGHTS INOPERATIVE
• IS FUSE C-14 (15A) NORMAL? I
l
l l
YES I NO l
I I
• IS [MJ SECURELY GROUNDED? I REPLACE THE FUSE l
I
I I
YES I NO I
I 1
• IS BATTERY VOLTAGE APPLIED TO 1 ~ (1 [[ill) GROUND IT SECURELY I OF THE STOPLIGHT SW (OR THE BRAKE SW)7
I
I I
YES I NO l
I I
• REMOVE THE STOPLIGHT SW (OR THE BRAKE SW). REPAIR A POOR CONNECTION AT CONNECTORS
• IS THERE ANY CONTINUITY BETWEEN 11 B-141 AND OR AN OPEN CIRCUIT BETWEEN THE FUSE C-14 (15Al
21 B-14I!OR 11 B-131 AND
4 ~ l OF THE SWITCH AND 1 I B-14 I (1 ~ ).
WHEN PUSH ROO IS OUT?
I
I I
YES I NO I
I T
• DOES THE PUSH ROD OF THE STOPLIGHT SW (OR THE REPLACE THE STOPLIGHT SW (OR BRAKE SW) . 1 BRAKE SW) OPERATE SMOOTHLY?
I
I I
YES I NO I
J -1
REPAIR A POOR CONNECTION OF CONNECTORS OR AN REPLACE THE STOPLIGHT SW (OR BRAKE SW). I OPEN CIRCUIT BETWEEN 21]}!] 141 B-131 lAND 10! H-321

8 -98 CHASSIS ELECTRICAL
1-2 STOPLIGHT ON THE LEFT (OR RIGHT)
SIDE INOPERATIVE
~
--
' "• IS THE STOPLIGHT BULB ON THE LEFT (OR RIGHT) SIDE NORMAL? l •
I
I
I
YES
j NO I
I I
• IS THERE ANY CONTINUITY BETWEEN
THE STOPLIGHT REPLACE THE BULB I CONNECTOR 5 []}] 15(]]] I AND 10 IH-32 I?
I
I I
YES
I NO I
J I
REPAIR A POOR CONNECTION AT CONNECTORS OR AN REPAIR A POOR CONNECTION AT CONNECTO qs OR
OPEN CIRCUIT BETWEEN 1 [[[) 11[[[) I AND []I) AN OPEN CIRCUIT IN THE CIRCUIT
1-3 HIGH MOUNT STOPLIGHT INOPERATIVE
• IS ["ill SECURELy GROUNDED? I .~
I
I I
YES
I NO I
I I
• REMOVE THE HIGH MOUNT STOPLIGHT
GROUND IT SECURELY I
• IS THERE ANY CONTINUITY BETWEEN THE HIGH MOUNT
STOPLIGHT CONNECTOR 1 []TI AND 2 ~
I
I I
YES
j NO I
I I
• IS THE BATIERY VOLTAGE
APPLIED BETWEEN 1W] AND REPAIR OR REPLACE THE HIGH MOUNT STOPLIG ~T I THE GROUND WHEN THE BRAKE PEDAL IS DEPRESSED?
I
I I
YES j NO I
I 1
• REPAIR A POOR CONNECTION AT THE CONNECTORS OR REPAIR A POOR CONNECTION AT THE CONNECT DRS
AN OPEN
CIRCUIT BETWEEN 2 ~AND []I] OR AN OPEN CIRCUIT BETWEEN 1 [§TIANO 1 W±ill
~
•

CHASSIS ELECTRICAL 8 -99
2-1 REAR DEFOGGER DOES NOT OPERATE
• ARE THE FUSES C-4 (10Al AND C-17
I (25Al NORMAL?
I
I
YES I NO l
I
• IS THE REAR DEFOGGER RELAY NORMAL? REPLACE THE FUSE. I
I
I
YES I NO I
1
• IS THE REAR DEFOGGER SWITCH NORMAL? I REPLACE THE RELAY I
I
I
YES I NO I
I
• ARE WJ AND ~GROUNDED SECURELY? I REPAIR OR REPLACE THE SWITCH.l
I
I
YES I NO I
I
• TURN ON THE STARTER SWITCH AND THE REAR DEFOGGER
GROUND THEM SECURELY. I SWITCH.
• IS THERE A BATIERY VOLTAGE APPLIED BETWEEN THE REAR DEFOGGER CONNECTOR 1 ~ AND THE GROUND?
I
I
YES I NO l
I
REPAIR A POOR CONNECTION OF THE REPAIR A POOR CONNECTION AT THE
CONNECTORS CONNECTORS OR AN OPEN
CIRCUIT IN
OR AN OPEN CIRCUIT BETWEEN 1[]TI EACH OF THE FOLLOWING
AND[BTI CONNECTIONS: FUSE C-17 (25Al AND
2 I B-38 • FUSE C-4 (10Al AND 31 B-38 I.
4
1B-38 AN~,4~AND 1 ~ , 5 1-17 AND B-19
.

8-100 CHASSIS ELECTRICAL
2-2 REAR DEFOGGER TIMER DOES NOT FUNCTION
I REPLACE THE REAR DEFOGGER SWITCH I
•