Toyota Tacoma (2015-2018) Service Manual: Navigation Receiver Assembly Communication Stop Mode

Toyota Tacoma (2015-2018) Service Manual / Can Communication / Can Communication System / Navigation Receiver Assembly Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Navigation Receiver Assembly Communication Stop Mode	Either condition is met: Communication stop for "Display and Navigation (AVN1)" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication system DTCs (DTCs that start with U) that correspond to "Navigation Receiver Assembly Communication Stop Mode" in "DTC Combination Table" are output. Click here	Navigation receiver assembly branch line or connector Power source circuit of navigation receiver assembly Navigation receiver assembly ground circuit Navigation receiver assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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Some parts must be initialized and set when replacing or removing and installing parts.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	CHECK FOR OPEN IN CAN BUS LINES (NAVIGATION RECEIVER ASSEMBLY BRANCH LINE)

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Disconnect the navigation receiver assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N25-9 (CANH) - N25-10 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Text in Illustration

*a	Front view of wire harness connector (to Navigation Receiver Assembly)

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the navigation receiver assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N24-7 (GND1) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
N24-3 (ACC1) - Body ground	Ignition switch ACC	11 to 14 V
N24-4 (+B1) - Body ground	Always	11 to 14 V
N25-1 (IG) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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Open in Bus 2 Main Bus Line

DESCRIPTION There may be an open circuit in one of the CAN main bus lines and/or a central gateway ECU (network gateway ECU) branch lines when the resistance between terminals 18 (CA4H) and 17 (C ...

Other materials:

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ECU Malfunction (B1003)
DESCRIPTION DTC No. DTC Detection Condition Trouble Area B1003 A malfunction in the non-volatile storage of the central gateway ECU (network gateway ECU) is detected. Central gateway ECU (network gateway ECU) PROC ...