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SYSTEM OUTLINE
Current always flows to TERMINAL (B) 5 of the combination meter through the DOME fuse.
1. SEAT BELT WARNING SYSTEM
When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL (A) 9 of the combination meter. This
current activates the combination meter and the current flowing through the seat belt warning light flows from TERMINAL (B)
8 to GROUND, causing the warning light to light up. A buckle SW off signal is input to TERMINAL (B) 12 of the combination
meter to TERMINAL (B) 8 to GROUND, causing the warning light to light up. A buckle SW off signal is input to TERMINAL
(B) 12 of the combination meter, the current flowing to TERMINAL (B) 5 of the combination meter flows from TERMINAL (B)
8 to GROUND and the seat belt warning buzzer sounds. However, if the seat belt is put on during this period (While the
buzzer is sounding), signal input to TERMINAL (B) 12 of the combination meter stops and the current flow from TERMINAL
(B) 5 of the combination meter to TERMINAL (B) 8 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 (B) 13 of the combination meter, the combination meter
operates, current flows from TERMINAL (B) 5 of the combination meter to TERMINAL (B) 8 to GROUND and key reminder
buzzer sounds.
SERVICE HINTS
B7 (A), (B) BUCKLE SW LH
(A) 1–(A) 2, (B) 2–(B) 1 : Closed with driver's seat belt in use
D16 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
C11 (A), C12 (B), C13 (C) COMBINATION METER
(A) 7, (B) 8–GROUND : Always continuity
(B)13–GROUND : Continuity with the front LH door open
(C) 1–GROUND : Continuity with the ignition key in cylinder
(B)12–GROUND : Continuity with the driver's seat belt in use
(B) 5–GROUND : Always approx. 12 volts
(A) 9–GROUND : Approx. 12 volts withe ignition SW at ON or ST position
: PARTS LOCATION
Code
See Page
A
38 (w/ Power Seat)
36 (Access Cab *3)
B
B
37 (Standard Cab *3)
B7
36 (Access Cab *4)
C
C
37 (Standard Cab *4)
C11
A
34
: RELAY BLOCKS
Code
See Page
2
21
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code
See Page
22 (*2)
1E
1E
26 (*1)
22 (*2)
1F
1F
26 (*1)
* 1 : w/ Daytime Running Light
Code
C12
B
C13
C
D16
D16
J4
J7
Relay Blocks (Relay Block Location)
Engine Room R/B (Engine Compartment Left)
Junction Block and Wire Harness (Connector Location)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
Cowl Wire and Driver Side J/B (Lower Finish Panel)
* 2 : w/o Daytime Running Light
2003 TOYOTA TUNDRA (EWD491U)
See Page
34
34
36 (Access Cab)
37 (Standard Cab)
35
35
* 3 : Bench Seat
Code
J8
35
J10
35
J23
A
35
J24
B
35
U1
35
* 4 : Separate Seat, Captain Seat (w/o Power Seat)
See Page
211
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