Toyota AT180 Series Repair Manual page 115

SYSTEM OUTLINE
CURRENT ALWAYS FLOWS TO TERMINAL 1 OF THE SEAT BELT WARNING RELAY (INTEGRATION RELAY NO.1) THROUGH DOME
FUSE.
1. SEAT BELT WARNING SYSTEM
WHEN THE IGNITION SW IS TURN ON, CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 7 OF THE SEAT BELT WARNING
RELAY. AT THE SAME TIME, CURRENT FLOWS TO TERMINAL 9 OF THE RELAY FROM THE GAUGE FUSE THROUGH THE SEAT BELT
WARNING LIGHT. THIS CURRENT ACTIVATES THE SEAT BELT WARNING RELAY AND, FOR APPROX. 4–8 SECONDS, CURRENT
FLOWING THROUGH THE WARNING LIGHT FLOWS FROM TERMINAL 9 OF THE RELAY
WARNING LIGHT TO LIGHT UP. AT THE SAME AS THE WARNING LIGHT LIGHTS UP, A BUCKLE SW OFF SIGNAL IS INPUT TO
TERMINAL 8 OF THE RELAY, THE CURRENT FLOWING TO TERMINAL 1 OF THE RELAY FLOWS FROM TERMINAL 10
THE SEAT BELT WARNING BUZZER SOUNDS FOR APPROX. 4–8 SECONDS. HOWEVER, IF THE SEAT BELT IS PUT ON (BUCKLE SW
ON) DURING THIS PERIOD (WHILE THE BUZZER IS SOUNDING), SIGNAL INPUT TO TERMINAL 8 OF RELAY STOPS AND THE
CURRENT FLOW FROM TERMINAL 1 OF THE RELAY
2. UNLOCK WARNING SYSTEM
WITH THE IGNITION KEY INSERTED IN THE KEY CYLINDER (UNLOCK SW ON). THE IGNITION SW STILL OFF AND DOOR OPEN (DOOR
COURTESY SW ON), WHEN A SIGNAL IS INPUT TO TERMINAL 6 OF THE RELAY, THE SEAT BELT WARNING RELAY OPERATES,
CURRENT FLOWS FROM TERMINAL 1 OF THE RELAY
SERVICE HINTS
UNLOCK WARNING SW
I12
1–5 : CLOSED WITH IGNITION KEY IN CYLINDER
SEAT BELT WARNING RELAY
10–GROUND : ALWAYS CONTINUITY
6–GROUND : CONTINUITY WITH DRIVER'S DOOR OPEN
5–GROUND : CONTINUITY WITH IGNITION KEY IN CYLINDER
8–GROUND : CONTINUITY WITH DRIVER'S LAP BELT IN USE
9–GROUND : 0 VOLTS FOR 4–8 SECONDS WITH IGNITION SW ON AND APPROX.12 VOLTS 4–8 SECONDS AFTER IGNITION SW ON
1–GROUND : APPROX. 12 VOLTS WITH IGNITION SW ON
DOOR COURTESY SW
D10
1–GROUND : CLOSED WITH DRIVER'S DOOR OPEN
BUCKLE SW
B 8, B 9,
2–1 : CLOSED WITH DRIVER'S LAP BELT IN USE
: PARTS LOCATION
CODE SEE PAGE
B 8 30 (L/B), 31 (C/P)
B 9 30 (L/B), 31 (C/P)
C14 A 28
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE SEE PAGE
1A
1D 18 18
1E
1F 18
1H 18
2E 20
3B 22
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE SEE PAGE
38 (L/B)
BL1 BL1
40 (C/P)
38 (L/B)
BM1 BM1
40 (C/P)
: GROUND POINTS
CODE SEE PAGE
ID 36
BI 38 (L/B)
TERMINAL 10
CODE
C15 B
D10
I12
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL) COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
FLOOR WIRE AND J/B NO. 1 (LEFT KICK PANEL)
ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
ENGINE ROOM MAIN WIRE AND J/B NO. 2 (NEAR THE BATTERY)
COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
FLOOR WIRE AND FRAME WIRE (LEFT SIDE OF FRONT FLOOR PANEL) FLOOR WIRE AND FRAME WIRE (LEFT SIDE OF FRONT FLOOR PANEL)
FRAME WIRE AND SEAT WIRE (UNDER THE DRIVER'S SEAT) FRAME WIRE AND SEAT WIRE (UNDER THE DRIVER'S SEAT)
GROUND POINTS LOCATION
LEFT KICK PANEL
UNDER THE LEFT CENTER PILLAR
GROUND IS CUT, CAUSING THE BUZZER TO STOP.
TERMINAL 10 GROUND AND THE UNLOCK WARNING BUZZER SOUNDS.
SEE PAGE
28
30 (L/B), 31 (C/P)
29
TERMINAL 10 GROUND, CAUSING THE
CODE SEE PAGE
J 1 29
J 6 29
GROUND AND
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