Toyota Sienna Service Manual: AVC-LAN Circuit
DESCRIPTION
Each unit of the audio system connected to the AVC-LAN (communication bus) transfers the signal of each switch by communication.
When a short to +B or short to ground occurs in this AVC-LAN, the audio system will not function normally as the communication is discontinued.
INSPECTION PROCEDURE
1 INSPECT RADIO RECEIVER
- Disconnect the radio receiver connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
*1: 10 Speaker System
2 CHECK HARNESS AND CONNECTOR
HINT: For details of the connectors, refer to the "TERMINALS OF ECU"
- Referring to the AVC-LAN wiring diagram below, check all AVC-LAN circuits.
- Disconnect all connectors in all AVC-LAN circuits.
- Check for an open or short in all AVC-LAN circuits.
OK: There is no open or short circuit
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
Mute Signal Circuit between Radio Receiver and Television Display
Assembly
DESCRIPTION
The radio receiver controls the volume according to the MUTE signal from the
television display
assembly.
The MUTE signal is sent to reduce noise and a popping sound generated when ...
Vehicle Speed Signal Circuit between Multi-display 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 fun ...
Other materials:
Bluetooth Module Initialization Failed
DTC 57-47 Bluetooth Module Initialization Failed
DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
57-47
Bluetooth module is not installed.
Problem with Bluetooth module
Problem in communication line to Bluetooth module
...
Auto Up / Down Function does not Operate
DESCRIPTION
If the AUTO UP/DOWN function does not operate, any of the following troubles
may be the cause:
When the PWR fuse or the power window relay (Marking: PWR) is
replaced with new ones, or when
the battery terminal and the connector of the power window master switch are
d ...
Removal
1. DISCHARGE FUEL SYSTEM PRESSURE
HINT:
See page FU-1.
2. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
3. REMOVE NO. 1 ENGINE UNDER COVER
4. DRAIN ENGINE COOLANT (See page CO-6)
5. REMOVE FRONT WIPER ARM HEAD CAP (See page
WW-4)
6. REMOVE FRONT WIPER ARM RH (See page WW-4)
7. REMOVE FRO ...
