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HOW TO USE THIS MANUAL B
This manual provides information on the electrical circuits installed on vehicles by
dividing them into a circuit for each system.
The actual wiring of each system circuit is shown from the point where the power
source is received from the battery as far as each ground point. (All circuit
diagrams are shown with the switches in the OFF position.)
When troubleshooting any problem, first understand the operation of the circuit
where the problem was detected (see System Circuit section), the power source
supplying power to that circuit (see Power Source section), and the ground points
(see Ground Point section). See the System Outline to understand the circuit
operation.
When the circuit operation is understood, begin troubleshooting of the problem
circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing
sections to find each part, junction block and wiring harness connectors, wiring
harness and wiring harness connectors, splice points, and ground points of each
system circuit. Internal wiring for each junction block is also provided for better
understanding of connection within a junction block.
Wiring related to each system is indicated in each system circuit by arrows
(from__, to__). When overall connections are required, see the Overall Electrical
Wiring Diagram at the end of this manual.
3
2005 SIENNA (EWD613U)
B HOW TO USE THIS MANUAL
[A] The system shown here is an EXAMPLE ONLY. It is different to the actual
circuit shown in the SYSTEM CIRCUITS SECTION.
Stop Light
From Power Source System (See Page 66)
15A 7.5A
STOP GAUGE
4
R L
2 IB
[B] 1 3 IB
1 IB
[C] [G]
W R
2 IB
R (W/G)
L (S/D)
R L
2
S6 4
Stop Light SW
Lights
14 IE1 [E] C7
Rear
Combination
[D] 1 Meter
13
G W
L (S/D)
G W
ABS ECU I5
[F]
Y G
G W
L4
7 8 Light Failure Sensor 4
2 1 11
G R
[H]
1
G R
G B
BV1 B18 [I] [J]
G R
G R
(Shielded)
Rear Combination Light RH
Rear Combination Light LH
4 3 2
H17
W B
[K] High Mounted
Stop
Stop
Stop Light
1
R7
R6
3 6
W B
W B
W B
1
W B
BV1 B18
W B
BO BL
[L]
50 [M]
4
2005 SIENNA (EWD613U)
B
[A] : System Title [H] : Indicates the wiring color.
[B] : Indicates a Relay Block. No shading is used and Wire colors are indicated by an alphabetical code.
only the Relay Block No. is shown to distinguish it B = Black W = White BR = Brown
from the J/B
L = Blue V = Violet SB = Sky Blue
Example: Indicates Relay Block No.1
R = Red G = Green LG = Light Green
[C] : ( ) is used to indicate different wiring and P = Pink Y = Yellow GR = Gray
connector, etc. when the vehicle model, engine
type, or specification is different. O = Orange
[D] : Indicates related system. The first letter indicates the basic wire color and the
second letter indicates the color of the stripe.
[E] : Indicates the wiring harness and wiring harness
connector. The wiring harness with male terminal is Example: L-Y
shown with arrows ( ).
Outside numerals are pin numbers.
L Y
(Blue) (Yellow)
[I] : Indicates a wiring Splice Point (Codes are "E" for the
Engine Room, "I" for the Instrument Panel, and "B"
for the Body).
Female Male ( )
The first letter of the code for each wiring harness
and wiring harness connector(s) indicates the
component's location, e.g, "E" for the Engine
Compartment, "I" for the Instrument Panel and
Surrounding area, and "B" for the Body and
Surrounding area.
When more than one code has the first and second
letters in common, followed by numbers (e.g, IH1,
IH2), this indicates the same type of wiring harness The Location of splice Point I 5 is indicated by the
and wiring harness connector. shaded section.
[F] : Represents a part (all parts are shown in sky blue). [J] : Indicates a shielded cable.
The code is the same as the code used in parts
position.
[G] : Junction Block (The number in the circle is the J/B
No. and the connector code is shown beside it).
Junction Blocks are shaded to clearly separate
them from other parts. [K] : Indicates the pin number of the connector.
The numbering system is different for female and
male connectors.
Example:
Example: Numbered in order Numbered in order
from upper left to from upper right to
3C indicates that lower right lower left
it is inside
Junction Block
No.3
Female Male
[L] : Indicates a ground point.
The first letter of the code for each ground point(s)
indicates the component's location, e.g, "E" for the
Engine Compartment, "I" for the Instrument Panel
and Surrounding area, and "B" for the Body and
Surrounding area.
[M] : Page No.
5
2005 SIENNA (EWD613U)
B HOW TO USE THIS MANUAL
[N] System Outline
Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW.
When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 8 of the light failure sensor, and also flows
through the rear lights warning light to TERMINAL 4 of the light failure sensor.
Stop Light Disconnection Warning
When the ignition SW is turned on and the brake pedal is pressed (Stop light SW on), if the stop light circuit is open, the current
flowing from TERMINAL 7 of the light failure sensor to TERMINALS 1, 2 changes, so the light failure sensor detects the
disconnection and the warning circuit of the light failure sensor is activated.
As a result, the current flows from TERMINAL 4 of the light failure sensor to TERMINAL 11 to GROUND and turns the rear lights
warning light on. By pressing the brake pedal, the current flowing to TERMINAL 8 of the light failure sensor keeps the warning
circuit on and holds the warning light on until the ignition SW is turned off.
[O] Service Hints
S6 Stop Light SW
2-1 : Closed with the brake pedal depressed
L4 Light Failure Sensor
1, 2, 7-Ground : Approx. 12 volts with the stop light SW on
4, 8-Ground : Approx. 12 volts with the ignition SW at ON position
11-Ground : Always continuity
[P] : Parts Location
Code See Page Code See Page Code See Page
C7 34 L4 36 R7 37
H17 36 R6 37 S6 35
: Relay Blocks
[Q]
Code See Page Relay Blocks (Relay Block Location)
1 18 R/B No.1 (Instrument Panel Brace LH)
[R] : Junction Block and Wire Harness Connector
Code See Page Junction Block and Wire Harness (Connector Location)
IB 20 Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
3C 22 Instrument Panel Wire and J/B No.3 (Instrument Panel Brace LH)
[S] : Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IE1 42 Floor Wire and Instrument Panel Wire (Left Kick Panel)
BV1 50 Luggage Room Wire and Floor Wire (Luggage Room Left)
[T]
: Ground Points
Code See Page Ground Points Location
BL 50 Under the Left Center Pillar
BO 50 Back Panel Center
[U]
: Splice Points
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I5 44 Cowl Wire B18 50 Luggage Room Wire
6
2005 SIENNA (EWD613U)
B
[N] : Explains the system outline.
[O] : Indicates values or explains the function for reference during troubleshooting.
[P] : Indicates the reference page showing the position on the vehicle of the parts in the system circuit.
Example : Part "L4" (Light Failure Sensor) is on page 36 of the manual.
The letter in the code is from the first letter of the part, and the number indicates its order in parts
starting with that letter.
Example : L 4
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