Isuzu 1999 RODEO Workshop Manual page 2240

8D–90 WIRING SYSTEM
Diagnosis
Both Tail Lights Inoperative
Step
1 Is fuse (15A) normal?
2 Is the tail relay normal?
3 Is B-8 terminal ground securely?
4 Remove the connector of the lighting switch.
Is there continuity between I-32 terminals 3 and 2 when
the switch is turned to parking or headlight position?
5 Is the battery voltage applied between the harness side
connectors I-32 terminal 3 and the ground?
6 Repair a poor connection at the connectors or an open
circuit between I-34 terminal 1 and H-25 terminal 14 or
B-13 terminal 4 (B-9 terminal 4 and B-8 terminal)
Is the action complete?
Tail Light On The Left (or Right) Side Inoperative
Step
1 Is the taillight bulb on the left (or right) side normal?
2 Is there continuity between H-25 terminal 14 and B-13
terminal 13 (B-9 terminal 3)?
3 Repair a poor connection of the connectors or an open
circuit between B-13 terminal 4 (B-9 terminal 4) and B-8
terminal.
Is the action complete?
NOTE: Connectors in parenthesis "( )" indicates the
check point of the taillight on the right side.
Action
Action
Value(s) Yes
— Go to Step 2
— Go to Step 3
— Go to Step 4
— Go to Step 5
— Go to Step 6
— Verify repair
Value(s) Yes
— Go to Step 2
— —
— Verify repair
No
Replace the
fuse
Replace the
tail relay
Ground B-8
terminal
securely
Repair or
replace the
lighting switch
Repair a poor
connection at
the
connectors or
an open
circuit
between fuse
(15A) and
I-32 terminal
3
—
No
Replace the
bulb
Repair a poor
connection of
the
connectors or
an open
circuit in the
circuit.
—