Toyota Tundra (2015 year). Manual — part 2972
Last Modified: 9-16-2014
6.6 U
Doc ID: RM0000014DJ0BIX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: SEAT BELT: SEAT BELT WARNING SYSTEM: TERMINALS OF ECU; 2015 MY Tundra [08/2014 - ]
TERMINALS OF ECU
1. CHECK COMBINATION METER ASSEMBLY
(a) Disconnect the J28 combination meter assembly connector.
(b) Disconnect the J28 combination meter assembly connector.
(c) Measure the resistance and voltage according to the value(s) in the table below.
TERMINAL NO. (SYMBOL)
WIRING COLOR
TERMINAL
DESCRIPTION
CONDITION
SPECIFIED
CONDITION
J28-2 (IG+) - Body
ground
P - Body ground
Ignition power supply
(IG signal)
Ignition switch
off
Below 1 V
Ignition switch
ON
11 to 14 V
J28-1 (B) - Body ground
LG - Body ground Battery power supply
Always
11 to 14 V
J28-24 (ES) - Body
ground
W-B - Body
ground
Ground
Always
Below 1 Ω
(d) Reconnect the J28 combination meter assembly connector.
(e) Measure the voltage according to the value(s) in the table below.
TERMINAL NO.
(SYMBOL)
WIRING
COLOR
TERMINAL
DESCRIPTION
CONDITION
SPECIFIED
CONDITION
J28-30 (SI) - Body
ground
LG - Body
ground
Speed signal (input)
Ignition switch ON, wheel
turned slowly
Pulse generation
2. CHECK CENTER AIRBAG SENSOR ASSEMBLY
SEAT BELT: SEAT BELT WARNING SYSTEM: TERMINALS OF ECU;...
TERMINAL NO.
TERMINAL SYMBOL
DESTINATION
P1-11
DBE+
Front seat inner belt assembly LH
P1-12
DBE-
Front seat inner belt assembly LH
Q1-12
FSP+
Occupant detection ECU
Q1-13
FSP-
Occupant detection ECU
3. CHECK OCCUPANT DETECTION ECU
(a) Measure the voltage according to the value(s) in the table below.
HINT:
TERMINAL NO.
(SYMBOL)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFICATION
Y2-1 (+B) - Y2-3
(GND)
W - W-B
Battery
Ignition switch ON
11 to 14 V
Y2-2 (DIA) -
Y2-3 (GND)
GR - W-B
Diagnosis (DLC3)
Ignition switch ON
Pulse
generation
Y2-3 (GND) -
Body ground
W-B - Body
ground
Ground
Always
Below 1 Ω
Y2-4 (FSR-) -
Y2-3 (GND)
Y - W-B
Center airbag sensor
communication ground line
Always
Below 1 Ω
SEAT BELT: SEAT BELT WARNING SYSTEM: TERMINALS OF ECU;...
TERMINAL NO.
(SYMBOL)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFICATION
Y2-5 (BGND) -
Y2-3 (GND)
P - W-B
Passenger side buckle switch
ground line
Always
Below 1 Ω
Y2-7 (IG2) -
Y2-3 (GND)
B - W-B
Power source (IGN fuse)
Ignition switch ON
11 to 14 V
Y2-8 (FSR+) -
Y2-4 (FSR-)
L - Y
Center airbag sensor
communication line
Ignition switch ON
Pulse
generation
Y2-9 (BSW) -
Y2-5 (BGND)
G - P
Passenger side buckle switch
line
Ignition switch ON, buckle switch
ON
0.12 to 0.18 A
Ignition switch ON, buckle switch
OFF
0.4 to 0.7 mA
Y1-1 (SGD1) -
Y2-3 (GND)
G - W-B
Front occupant detection
sensor LH ground line
Always
Below 1 Ω
Y1-2 (SGD2) -
Y2-3 (GND)
O - W-B
Front occupant detection
sensor RH ground line
Always
Below 1 Ω
Y1-3 (SGD3) -
Y2-3 (GND)
W - W-B
Rear occupant detection
sensor LH ground line
Always
Below 1 Ω
Y1-4 (SGD4) -
Y2-3 (GND)
BR - W-B
Rear occupant detection
sensor RH ground line
Always
Below 1 Ω
Y1-11 (SVC1) -
Y1-1 (SGD1)
R - G
Front occupant detection
sensor LH power supply line
Ignition switch ON, load is
applied to front occupant
detection sensor LH
4.5 to 5.1 V
Y1-12 (SVC2) -
Y1-2 (SGD2)
W - O
Front occupant detection
sensor RH power supply line
Ignition switch ON, load is
applied to front occupant
detection sensor RH
4.5 to 5.1 V
Y1-5 (SVC3) -
Y1-3 (SGD3)
GR - W
Rear occupant detection
sensor LH power supply line
Ignition switch ON, load is
applied to rear occupant
detection sensor LH
4.5 to 5.1 V
Y1-6 (SVC4) -
Y1-4 (SGD4)
V - BR
Rear occupant detection
sensor RH power supply line
Ignition switch ON, load is
applied to rear occupant
detection sensor RH
4.5 to 5.1 V
Y1-7 (SIG1) -
Y1-1 (SGD1)
P - G
Front occupant detection
sensor LH signal line
Ignition switch ON, load is
applied to front occupant
detection sensor LH
Pulse
generation
Y1-8 (SIG2) -
Y1-2 (SGD2)
L - O
Front occupant detection
sensor RH signal line
Ignition switch ON, load is
applied to front occupant
detection sensor RH
Pulse
generation
Y1-9 (SIG3) -
Y1-3 (SGD3)
Y - W
Rear occupant detection
sensor LH signal line
Ignition switch ON, load is
applied to rear occupant
detection sensor LH
Pulse
generation
Y1-10 (SIG4) -
Y1-4 (SGD4)
B - BR
Rear occupant detection
sensor RH signal line
Ignition switch ON, load is
applied to rear occupant
detection sensor RH
Pulse
generation
SEAT BELT: SEAT BELT WARNING SYSTEM: TERMINALS OF ECU;...
SEAT BELT: SEAT BELT WARNING SYSTEM: TERMINALS OF ECU;...
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