Toyota Sienna Service Manual: Speaker Circuit
DESCRIPTION
The sound signal that has been amplified by the stereo component amplifier is
sent to the speakers from
the stereo component amplifier through this 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.
When a short is detected in the speaker circuit, no sound can be heard from the
speakers.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR
- Disconnect the connectors shown in the illustration on
the left from the stereo component amplifier and
speakers.
- Measure the resistance between 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
- Measure the resistance between rear speakers 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 front stereo
component 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 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 front No. 1 speaker
and the front No. 2 speaker to check for an open circuit
in the wire harness.
Standard resistance:
Below 1 Ω
- Measure the resistance between the rear stereo
component 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 each speaker and body
ground to check for a short circuit in the wire harness.
Standard resistance:
10 kΩ or higher
2 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
INSPECT FRONT NO. 1 SPEAKER
- Resistance check.
- Measure the resistance between the terminals of
the speaker.
Standard resistance:
4 to 6 Ω
4 INSPECT FRONT NO. 2 SPEAKER
- Check that the malfunction disappears when another
speaker in good condition is installed.
OK:
Malfunction disappears.
HINT:
- Connect all the connectors to the front No. 2
speakers.
- When there is a possibility that either right or left front
speaker is defective, inspect by interchanging the
right one with the left one.
5 INSPECT REAR SPEAKER
- Resistance check.
- Measure the resistance between the terminals of
the speaker.
Standard resistance:
Approximately 2.6 Ω
6 INSPECT FRONT STEREO COMPONENT SPEAKER
- Resistance check.
- Measure the resistance between the terminals of
the speaker.
Standard resistance:
1.2 to 2.2 Ω
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 speakers.
- When there is a possibility that either right or left front
speaker is defective, inspect by interchanging the
right one with the left one.
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
DESCRIPTION
This circuit is from the parking brake switch to the radio and navigation
assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK BRAKE WARNING LIGHT
Check that the brake warni ...
DESCRIPTION
The television display assembly sends an RSE sound signal to the radio and
navigation assembly through
this circuit. The sound signal that has been sent is amplified by the stereo
co ...
Other materials:
Precaution
1. REMOVAL AND INSTALLATION OF THE BATTERY TERMINAL
Before performing electrical work, disconnect the
battery negative (-) terminal in order to prevent a
short in the system.
When disconnecting and reconnecting the battery
cable, turn the ignition switch and lighting swit ...
Steering Angle Sensor Zero Point Malfunction
DTC C1290/66 Steering Angle Sensor Zero Point Malfunction
DESCRIPTION
The skid control ECU acquires steering angle sensor zero point every time the
ignition switch is turned to
the ON position and the vehicle is driven at 35 km/h (22 mph) or more for
approximately 5 seconds. The
ECU also sto ...
Disassembly
1. REMOVE STEERING INTERMEDIATE SHAFT ASSEMBLY
(a) Align the matchmarks on the steering intermediate
shaft assembly and main shaft.
(b) Remove the bolt and steering intermediate shaft
assembly.
2. REMOVE KEY CYLINDER LIGHT ASSEMBLY (w/o
Engine Immobiliser System)
3. REMOVE TRANSPONDER K ...