Toyota Sienna Service Manual: Speaker Circuit
DESCRIPTION
- When the vehicle has a built-in type amplifier, a sound signal is
sent from the radio receiver to the
speakers via the "6 Speaker System" circuit.
- When the vehicle has a separate type amplifier, a sound signal
from the radio receiver is amplified by
the stereo component amplifier and then transmitted to the speaker via the
"10 Speaker System"
circuit.
If there is a short in this circuit, the stereo component amplifier detects
it and stops output to the speakers.
Thus sound cannot be heard from the speakers even if there is no malfunction in
the stereo component
amplifier or speakers
WIRING DIAGRAM
1 CHECK HARNESS AND CONNECTOR
- Disconnect the connectors shown in the illustration from
the stereo component amplifier or radio receiver and
speakers.
- 10 Speaker System:
Measure the resistance between each of the front No. 2
speakers and the stereo component amplifier to check
for an open circuit in the wire harness.
Standard resistance:
Below 1 Ω
- 6 speaker System:
Measure the resistance between each of the front No. 2
speakers and the radio receiver to check for an open
circuit in the wire harness.
Standard resistance:
Below 1 Ω
- Measure the resistance between each of the front No. 2
speakers and each of the front No. 1 speakers to check
for an open circuit in the wire harness.
Standard resistance:
Below 1 Ω
- 10 Speaker System:
Measure the resistance between each of the rear
speakers and the stereo component amplifier to check
for an open circuit in the wire harness.
Standard resistance:
Below 1 Ω
- 6 Speaker System:
Measure the resistance between each of the rear
speakers and the radio receiver to check for an open
circuit in the wire harness.
Standard resistance:
Below 1 Ω
- 10 Speaker System:
Measure the resistance between each of the rear stereo
component speakers and the stereo component
amplifier to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ω
- 10 Speaker System:
Measure the resistance between the front stereo
component speaker and the stereo component amplifier
to check for an open circuit in the wire harness.
Standard resistance:
Below 1 Ω
- 10 Speaker System:
Measure the resistance between the woofer box speaker
and the stereo component amplifier to check for an open
circuit in the wire harness.
Standard resistance:
Below 1 Ω
- Measure the resistance between the each speaker and
body ground to check for a short circuit in the wire
harness.
Standard resistance:
10 kΩ or higher
2 INSPECT FRONT NO. 1 SPEAKER
- Resistance check.
- Measure the resistance between the terminals of
the speaker.
Standard resistance:
10 Speaker System:
4 to 6 Ω
6 Speaker System:
Approximately 4 Ω
3 INSPECT REAR SPEAKER
- Resistance check.
- Measure the resistance between the terminals of
the speaker.
10 Speaker System:
Approximately 2.4 Ω
6 Speaker System:
Approximately 4 Ω
4 INSPECT FRONT NO. 2 SPEAKER
- Check that the malfunction disappears when another
speaker in good condition is installed.
Standard:
Malfunction disappears.
HINT:
- Connect all the connectors to the front No. 2 speaker.
- When there is a possibility that either the right or left
front speaker is detective, inspect by interchanging
the right one with the left one.
- Perform the above inspection on both LH and RH
sides.
5 CONFIRM MODEL
Result
6 INSPECT WOOFER BOX SPEAKER
- Resistance check.
- Measure the resistance according to the value(s) in
the table below.
NOTICE:
The speaker should not be removed for
checking.
Standard resistance
7 INSPECT REAR STEREO COMPONENT SPEAKER
- Check that the malfunction disappears when another
speaker in good condition is installed.
OK:
Malfunction disappears.
HINT:
- Connect all the connectors to the rear stereo component
speaker.
- When there is a possibility that either the right or left rear
speaker is detective, inspect by interchanging the right one
with the left one
8 INSPECT FRONT STEREO COMPONENT SPEAKER
- Resistance check.
- Measure the resistance between the terminals of
the speaker.
Standard resistance:
1.2 to 2.2 Ω
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
DESCRIPTION
Power is supplied to the radio receiver and steering pad switch illumination
when the light control switch is
in the TAIL or HEAD position.
WIRING DIAGRAM
INSPECTION PROCEDURE
N ...
DESCRIPTION
The radio receiver sends a sound signal to the stereo component amplifier
through this circuit.
The sound signal that has been sent is amplified by the stereo component
amplifier, ...
Other materials:
Adjustment
1. INSPECT SHIFT LEVER POSITION
(a) When shifting from P to R position only with ignition
switch ON and brake pedal, make sure that the
shifting lever moves smoothly and can be
moderately operated.
(b) When starting engine, make sure that the vehicle
moves forward when shifting from N to D p ...
DTC check / clear
HINT:
Illustrations may differ from the actual vehicle depending
on the device settings and options. Therefore, some
detailed areas may not be shown exactly the same as on
the actual vehicle.
If the system cannot enter the diagnostic mode, inspect all AVC-LAN
communication ...
Evaporative Emission System Switching Valve
Control Circuit High
DTC P2420 Evaporative Emission System Switching Valve
Control Circuit High
DTC SUMMARY
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission)
System.
INSPECTION PROCEDURE
Refer to the EVAP System.
MONITOR DESCRIPTION
5 hours*1 after the ignition switch is t ...