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:
Reassembly
1. INSTALL REAR WHEEL CYLINDER CUP KIT
(a) Temporarily tighten the bleeder plug to the wheel
cylinder, and install the bleeder plug cap.
(b) Apply lithium soap base glycol grease to the 2 new
wheel cylinder cups and the 2 pistons.
(c) Install the 2 wheel cylinder cups to each piston.
...
Removal
1. REMOVE OUTSIDE MOULDING
Put protective tape around the outside moulding.
Using a heat light, heat the moulding between 40 to
60 C (104 to 140 F).
NOTICE:
Do not heat the moulding excessively.
Tie both piano wire ends to a wooden block or a
similar object.
Cut off the tape by ...
Diagnosis Circuit
DESCRIPTION
DTC output mode is set by connecting terminals TC and CG of the DLC3.
DTCs are displayed by blinking the SRS warning light.
HINT:
When each warning light stays blinking, a ground short in the
wiring of terminal TC of the DLC3 or an
internal ground short in each ECU is ...
