Toyota Tundra 2005 Service - Repair - Maintenance page 3933

Key Reminder and Seat Belt Warning (Access/Standard Cab)
System Outline
Current always flows to TERMINAL (B) 23 of the combination meter through the DOME fuse.
1. Seat Belt Warning System
When the ignition SW is turned on, current flows from the IGN fuse to TERMINAL (B) 24 of the combination meter. This
current activates the combination meter and the current flowing through the seat belt warning light flows from TERMINAL (B)
12 to GROUND, causing the warning light to light up. A buckle SW off signal is input to TERMINAL (A) 5 of the combination
meter to TERMINAL (B) 12 to GROUND, causing the warning light to light up. A buckle SW off signal is input to TERMINAL
(A) 5 of the combination meter, the current flowing to TERMINAL (B) 23 of the combination meter flows from TERMINAL (B)
12 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 (A) 5 of the combination meter stops and the current flow from TERMINAL
(B) 23 of the combination meter to TERMINAL (B) 12 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 (A) 30 of the combination meter, the combination meter
operates, current flows from TERMINAL (B) 23 of the combination meter to TERMINAL (B) 12 to GROUND and key
reminder buzzer sounds.
Service Hints
B7 Buckle SW LH (Captain Seat)
2-3 : Closed with the driver's seat belt in use
B7 Buckle SW LH (Separate Seat)
13-3 : Closed with the driver's seat belt in use
B7 Buckle SW LH (Bench Seat)
2-1 : Closed with the driver's seat belt in use
D16 Door Courtesy SW Front LH
1-Ground : Closed with the front LH door open
U1 Unlock Warning SW
1-2 : Closed with the ignition key in cylinder
C11 (A), C12 (B) Combination Meter
(B)12-Ground : Always continuity
(A)30-Ground : Continuity with the front LH door open
(A)29-Ground : Continuity with the ignition key in cylinder
(A) 5-Ground : Continuity with the driver's seat belt in use
(B)23-Ground : Always approx. 12 volts
(B)24-Ground : Approx. 12 volts with the ignition SW at ON or ST position
: Parts Location
Code
60 (*9)
62 (*7)
B7
63 (*8)
B13 62 (*7)
60 (*3)
B15 61 (*4)
63 (*8)
C4 A 56
C6 C 56
: Relay Blocks
Code See Page
2 23
* 1 : w/ Daytime Running Light
* 6 : Captain Seat * 7 : Access Cab Captain Seat
276
See Page Code
C11
C12
D16 D16
I24
I25
J3
J4
J7
Relay Blocks (Relay Block Location)
Engine Room R/B (Engine Compartment Left)
* 2 : w/o Daytime Running Light
* 8 : Standard Cab Bench Seat
2005 TOYOTA TUNDRA (EWD611U)
See Page
A 56
B 56
60 (*3)
61 (*4)
A 57
B 57
58
58
58
* 3 : Access Cab
Code
J13 58
J23 58
J66 A 58
J67 B 58
J83 62 (*7)
O10 62 (*7)
O16 63 (*8)
U1 59
* 4 : Standard Cab * 5 : Bench Seat
* 9 : Access Cab w/o Power Seat
See Page