Toyota Tacoma (2015-2018) Service Manual: AVC-LAN Circuit
DESCRIPTION
Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers the switch signals using the AVC-LAN.
If a short to +B or short to ground occurs in the AVC-LAN, the navigation system will not function normally because communication is not possible.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
The navigation receiver assembly is the master unit.
PROCEDURE
|
1. |
INSPECT NAVIGATION RECEIVER ASSEMBLY |
(a) Disconnect the navigation receiver assembly connectors.
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG | .gif) |
REPLACE NAVIGATION RECEIVER ASSEMBLY |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT) |
(a) Disconnect the N25 navigation receiver assembly connector.
(b) Disconnect the S23 stereo component amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
N25-7 (TX1+) - S23-8 (TX+) |
Always |
Below 1 Ω |
|
N25-8 (TX1-) - S23-7 (TX-) |
Always |
Below 1 Ω |
|
N25-7 (TX1+) - Body ground |
Always |
10 kΩ or higher |
|
N25-8 (TX1-) - Body ground |
Always |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT MALFUNCTIONING PARTS |
(a) Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.
HINT:
- Check all slave units.
- If disconnecting a slave unit causes the master unit to return to normal operation, the slave unit is defective and should be replaced.
OK:
Master unit returns to normal operation.
| OK | |
REPLACE MALFUNCTIONING PARTS |
| NG | |
REPLACE NAVIGATION RECEIVER ASSEMBLY |
Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier
DESCRIPTION
This circuit sends a signal to the stereo component amplifier assembly to mute
noise. Because of that, the noise produced by changing the sound source ceases.
If there is an open in th ...
Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination
Meter
DESCRIPTION
The stereo component amplifier assembly receives a vehicle speed signal from
the combination meter assembly to control the ASL function.
HINT:
A voltage of 12 V or 5 V is outp ...
Other materials:
SRS Warning Light Remains ON
DESCRIPTION
The SRS warning light is located on the combination meter assembly.
When the SRS condition is normal, the SRS warning light illuminates for approximately
6 seconds after the ignition switch is turned from off to ON, and then turns off
automatically.
If there is a malfunction in th ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If a trouble code is output during the DTC check, inspect the trouble areas listed
for that code. For details of the code, refer to the "See page" below.
Certification ECU (Smart Key ECU Assembly)
DTC Code
Detection Item
...
Installation
INSTALLATION
PROCEDURE
1. INSTALL TRANSMISSION CONTROL CABLE ASSEMBLY
(a) Install the transmission control cable assembly from outside the vehicle
body and attach the 3 claws of the cable retainer.
(b) Install the 2 nuts.
Torque:
5.5 N·m {56 kgf·cm, 49 in·lbf}
(c) Connect the transmissi ...
