Seat Belt Warning System; Key Reminder System - Toyota Camry 1999 Electrical Troubleshooting Manual

SYSTEM OUTLINE
Current always flows to TERMINAL 1 of the integration relay through the DOME fuse.

1. SEAT BELT WARNING SYSTEM

When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 7 of the integration 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 relay and the current flowing through the warning light flows from TERMINAL 9 of the relay to TERMINAL 10 to
GROUND, causing the warning light to light up. A buckle SW off signal is input to TERMINAL 8 of the relay to TERMINAL 10
to GROUND, causing the warning light to light 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 to GROUND and the seat belt warning buzzer sounds for
approx. 6 seconds. However, if the seat belt is put on during this period (While the buzzer is sounding), signal input to
TERMINAL 8 of the relay stops and the current flow from TERMINAL 1 of the relay to TERMINAL 10 to GROUND is cut,
causing the buzzer to stop.

2. KEY REMINDER SYSTEM

With the ignition key inserted in the key cylinder (Unlock warning SW on), the ignition SW still off and driver's door open
(Door courtesy SW on), when a signal is input to TERMINAL 6 of the integration relay, the relay operates, current flows from
TERMINAL 1 of the relay to TERMINAL 10 to GROUND and key reminder buzzer sounds.
SERVICE HINTS
B6, B7 BUCKLE SW LH
1–2 : Closed with driver's seat belt in use
D12 DOOR COURTESY SW FRONT LH
1–GROUND : Closed with front LH door open
U1 UNLOCK WARNING SW
1–2 : Closed with ignition key in cylinder
INTEGRATION RELAY [INSTRUMENT PANEL J/B]
10–GROUND : Always continuity
6–GROUND : Continuity with the driver's door open
5–GROUND : Continuity with the ignition key in cylinder
8–GROUND : Continuity with the driver's seat belt in use
1–GROUND : Always approx. 12 volts
: PARTS LOCATION
Code See Page
B6 32
B7 34
C8 A 30
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page
1D 20
1J
20 20
1M
1S 20
1T 20
1W 20
2J 22
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page
BQ1 46
Code
C10 C
D12
J4
Junction Block and Wire Harness (Connector Location)
Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
Cowl Wire and Instrument Panel J/B (Lower Finish Panel) Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
Floor Wire and Instrument Panel J/B (Lower Finish Panel)
Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
Cowl Wire and Engine Room J/B No.2 (Engine Compartment Left)
Joining Wire Harness and Wire Harness (Connector Location)
Floor Wire and Seat No.1 Wire (Under the Driver's Seat)
See Page
30
32
31
Code See Page
J11 31
J40 32
U1 31