Isuzu Trooper (1998-2002 year). Manual — part 921

8D–218

WIRING SYSTEM

DIAGNOSIS

Quick Chart for Check Points

Check point

Fuse

C-14 (15A)

Cable

harness

1

Both stoplights inoperative

Trouble mode

2

Stoplight on the left (or right) side inoperative

Stoplight

SW or

brake SW

Stoplight

bulb

High mounted stoplight inoperative

3

High mount

stoplight

ASM

WIRING SYSTEM

8D–219

1

Both Stoplights Inoperative

•

IS THE BATTERY VOLTAGE APPLIED TO 1 B-14 (1 B-13 )
OF THE STOPLIGHT SW (OR THE BRAKE SW)?

YES

YES

REPLACE THE FUSE

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN THE FUSE C-14 (15A)
AND 1 B-14 (1 B-13 )

NO

•

IS FUSE C-14 (15A) NORMAL?

•

IS R-4 GROUNDED SECURELY?

GROUND IT SECURELY

YES

NO

•

REMOVE THE STOPLIGHT SW (OR THE BRAKE SW) CONNECTOR.

•

WHEN DEPRESS THE BRAKE PEDAL, IS THERE ANY
CONTINUITY BETWEEN THE 1 B-14 AND 2 B-14
(OR 1 B-13 AND 4 B-13 ) OF THE SWITCH?

DOES THE PUSH ROD OF THE STOPLIGHT SW (OR THE
BRAKE SW ) OPERATE SMOOTHLY?

YES

NO

•

REPLACE THE STOPLIGHT SW (OR BRAKE SW)

REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 2 B-14 (4 B-13 ) AND 7 H-32

YES

NO

REPLACE THE STOPLIGHT SW (OR BRAKE SW)

8D–220

WIRING SYSTEM

2

Stoplight On The Left (Or Right) Side Inoperative

(Body Build-in Type Stoplight)

(Bumper Build-in Type Stoplight)

•

WITH THE STOPLIGHT SW OR BRAKE SW DEPRESSED, IS THE
BATTERY VOLTAGE APPLIED BETWEEN 5 R-13 (OR 5 R-12 )
AND THE GROUND?

YES

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 7 H-32 AND
5 R-13 (OR 5 R-12 )

NO

•

IS THE STOPLIGHT BULB ON THE LEFT (OR RIGHT) SIDE NORMAL?

REPLACE THE BULB

YES

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 1 R-13 (1 R-12 ) AND R-4

•

WITH THE STOPLIGHT SW OR BRAKE SW DEPRESSED, IS THE
BATTERY VOLTAGE APPLIED BETWEEN 3 F-7 (OR 3 F-8 )
AND THE GROUND?

YES

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 7 H-32 AND
3 F-7 (OR 3 F-8 )

NO

•

IS THE STOPLIGHT BULB ON THE LEFT (OR RIGHT) SIDE NORMAL?

REPLACE THE BULB

YES

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 2 F-7 (2 F-8 ) AND R-4

WIRING SYSTEM

8D–221

3

High Mounted Stoplight Inoperative

•

•

REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 2 G-9 AND R-3

ROMOVE THE HIGH MOUNTED STOPLIGHT CONNECTOR
IS THERE ANY CONTINUITY BETWEEN THE HIGH MOUNTED
STOPLIGHT CONNECTOR 1 G-9 AND 2 G-9 ?

YES

NO

GROUND IT SECURELY

YES

NO

REPAIR OR REPLACE THE HIGH MOUNTED
STOPLIGHT

•

YES

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 1 G-9 AND
1 H-37

•

IS R-3 SECURELY GROUNDED?

IS THE BATTERY VOLTAGE APPLIED BETWEEN 1 G-9
AND THE GROUND WHEN THE BRAKE PEDAL IS
DEPRESSED?