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
Parking Brake Switch Circuit
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 ...
Sound Signal Circuit between Radio and Navigation Assembly and
Television Display Assembly
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:
Terminals of ECU
1. CLEARANCE WARNING ECU
*1: with Front Clearance Sonar
2. AIR CONDITIONER AMPLIFIER ASSEMBLY
*1: with Front Clearance Sonar
*2: Manual A/C
*3: Auto A/C
Reference: waveform 1
HINT:
Terminal: CBZ - E, BBZ - E, Z- - Body ground
Gauge set: 2 ...
Vehicle Speed Signal Circuit between Radio Receiver and Combination
Meter
DESCRIPTION
This circuit is necessary for the ASL (Auto Sound Leveliser) built into the
radio receiver.
Speed signals are received from the combination meter and used for the ASL.
The ASL function automatically adjusts the sound data in order to enable hearing
the clear audio sound
even ...
Front No. 2 speaker
COMPONENTS
ON-VEHICLE INSPECTION
1. INSPECT FRONT NO.2 SPEAKER
HINT:
Remove interior parts so that the front No.2 speaker can
be seen.
Check the speaker installation.
OK:
The speaker is securely installed.
If the result is not as specified, reinstall the front
No.2 speak ...
