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:
Perform zero point calibration of yaw rate and deceleration sensor (when
using sst check wire)
NOTICE:
While obtaining the zero point, do not vibrate the
vehicle by tilting, moving or shaking it and keep it
in a stationary condition. (Do not turn the ignition
switch to the ON position.)
Be sure to do this on a level surface (with an
inclination of less than 1 %).
(a) Proc ...
Precaution
1. Check that the battery cables are connected to the
correct terminals.
2. Disconnect the battery cables when the battery is
given a quick charge.
3. Do not perform tests with a high voltage insulation
resistance tester.
4. Never disconnect the battery cables while the engine
is runnin ...
Camshaft Position "B" - Timing Over
HINT:
If DTC P0014, P0015, P0024 or P0025 is present, check the VVT (Variable Valve
Timing) system.
DESCRIPTION
Refer to DTC P0013 (See page ES-87).
MONITOR DESCRIPTION
DTC P0014 and P0024
The ECM compares current valve timing with target valve timing, while the
engine is running a ...
