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:

Open in ABS Solenoid Relay Circuit (C146E,C146F)
DESCRIPTION The ABS solenoid relay is built into the master cylinder solenoid. This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is OK, the relay turns on. DTC No. DTC Detecting Conditions Trouble Areas ...

Invalid Data Received from Vehicle Dynamics Control Module (U0416)
DESCRIPTION This DTC is detected if a wheel speed malfunction signal is sent from the skid control ECU (brake actuator assembly). DTC No. Detection Item DTC Detection Condition Trouble Area U0416 Invalid Data Received From V ...

Speaker Output Short (B15C3)
DESCRIPTION This DTC is stored when a malfunction occurs in the speakers. DTC No. DTC Detection Condition Trouble Area B15C3 A short is detected in the speaker output circuit. Harness or connector Speaker ...