Toyota Tacoma (2015-2018) Service Manual: AVC-LAN Circuit

Toyota Tacoma (2015-2018) Service Manual / Navigation / Multi Info Display / Navigation System / 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:

Tester Connection	Condition	Specified Condition
N25-7 (TX1+) - N25-8 (TX1-)	Always	60 to 80 Ω

Text in Illustration

*a	Component without harness connected (Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

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.

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

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.

REPLACE MALFUNCTIONING PARTS

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:

Adjustment
ADJUSTMENT PROCEDURE 1. BEFORE FILLING TRANSMISSION The AC60E automatic transmission assembly requires Toyota Genuine ATF WS. If the entire automatic transmission assembly, automatic transmission oil pan sub-assembly, drain plug, transmission valve body assembly and/or torq ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (for Vehicle not Involved in Collision) (a) Perform a diagnostic system check (See page ). (b) With the lower No. 1 instrument panel airbag assembly ...

Illumination for Panel Switch does not Come on with Tail Switch ON
PROCEDURE 1. CHECK VEHICLE SIGNAL (OPERATION CHECK) (a) Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check (See page ). (b) Check that the display changes between ON and OFF according to the light control ...