Toyota 4Runner: Audio Receiver Assembly Communication Stop Mode

Toyota 4Runner Service Manual / Power Source / Network / Networking / Can Communication System / Audio Receiver Assembly Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Audio Receiver Assembly Communication Stop Mode	Either condition is met: "Display and Navigation (AVN1)" is not displayed on the "Bus Check" screen. "Audio Receiver Assembly Communication Stop Mode" in "DTC Combination Table" applies.	Power source or inside radio and display receiver assembly Radio and display receiver assembly branch wire or connector Radio and display receiver assembly

HINT:

For vehicles with a radio and display receiver assembly only.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1.	DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and branch wire.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ).

2.	CHECK FOR OPEN IN CAN BUS WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY BRANCH WIRE)

(a) Disconnect the G49 radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
G49-9 (CANH) - G49-10 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

*a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

REPAIR OR REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY BRANCH WIRE OR CONNECTOR (CANH, CANL)

3.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - BATTERY AND BODY GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ).

(b) Disconnect the G48 and G49 radio and display receiver assembly connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G48-7 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G49-1 (IG) - Body ground	Ignition switch ON	11 to 14 V
G48-4 (B) - Body ground	Always	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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