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:
Linked mirror function when reversing (if equipped)
When the mirror select switch is in the L or R position, the outside rear
view mirrors will automatically angle downwards when the vehicle is
reversing in order to give a better view of the ground.
To disable this function, move the mirror select switch to the neutral
position (between L and R ...
Parts location
HOW TO PROCEED WITH
TROUBLESHOOTING
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS
(a) Confirm problem symptoms.
3 CHECK AND CLEAR DTCS
4 PROBLEM SYMPTOM CONFIRMATION
5 SYMPTOM SIMULATION
6 DTC CHECK (OTHER THAN MULTIPLEX DTC)
7 DTC CHART
8 PROBLEM SYMP ...
Removal
1. REMOVE INSTRUMENT CLUSTER CENTER NO. 1 FINISH PANEL
2. REMOVE INSTRUMENT CLUSTER CENTER NO. 2
FINISH PANEL
3. REMOVE SHIFT LEVER KNOB SUB-ASSEMBLY
4. REMOVE POSITION INDICATOR HOUSING ASSEMBLY
5. REMOVE INSTRUMENT CLUSTER CENTER LOWER FINISH PANEL SUB-ASSEMBLY
6. REMOVE CIGARETTE LIGHTER CO ...
