Audio / Visual / Telematics

Radio Receiver Power Source Circuit

~1min read
DESCRIPTION

This is the power source circuit to operate the radio and display receiver assembly.

WIRING DIAGRAM
CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE
  1. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - BATTERY, BODY GROUND)


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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G48-7 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G48-3 (ACC) - G48-7 (GND)

Ignition switch ACC

11 to 14 V

G48-4 (B) - G48-7 (GND)

Always

11 to 14 V

G49-1 (IG) - G48-7 (GND)

Ignition switch ON

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Radio and Display Receiver Assembly)


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Test yourself

A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.