Toyota 4Runner: Radio Broadcast cannot be Received or Poor Reception

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Radio Broadcast cannot be Received or Poor Reception

CAUTION / NOTICE / HINT

NOTICE:

After replacing the navigation receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, XM radio ID registration is necessary.

PROCEDURE

1.	CHECK NAVIGATION RECEIVER ASSEMBLY

(a) Check the radio automatic station search function.

(1) Check the radio automatic station search function by activating it.

Result	Proceed to
Automatic station search function does not stop	A
Automatic station search function stops on a station	B

USE SIMULATION METHOD TO CHECK

2.	CHECK OPTIONAL COMPONENTS

(a) Check if any optional components that may decrease reception capacity, such as sunshade film or a telephone antenna, are installed.

Result	Proceed to
Optional components are not installed	A
Optional components are installed	B

NOTICE:

Do not remove optional components without the permission of the customer.

REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)

3.	CHECK NAVIGATION RECEIVER ASSEMBLY

(a) Preparation for check

(1) Remove the antenna connector from the navigation receiver assembly.

(b) Check for noise

(1) Turn the ignition switch to ACC with the navigation receiver assembly connector connected.

(2) Turn the radio on and tune into AM mode.

(3) Place a screwdriver, thin wire or other metal object on the navigation receiver assembly antenna jack and check that noise can be heard from the speakers.

OK:

Noise can be heard from the speakers.

REPLACE NAVIGATION RECEIVER ASSEMBLY

4.	CHECK WINDOW GLASS ANTENNA WIRE

(a) Check for continuity in the window glass antenna wire.

NOTICE:

When cleaning the glass, wipe it in the direction of the wire with a soft dry cloth. Take care not to damage the wire. Do not use detergents or glass cleaners with abrasive ingredients. When measuring resistance, wrap a piece of tin foil around the tip of each probe and press the foil against the wire with your finger, as shown in the illustration.

HINT:

Check for continuity at the center of each antenna wire as shown in the illustration.

OK:

There is continuity in the window glass antenna wire.

Text in Illustration

*a	Tester Probe
*b	Antenna Wire
*c	Tin Foil

REPAIR WINDOW GLASS ANTENNA WIRE

5.	INSPECT NAVIGATION RECEIVER ASSEMBLY (POWER SOURCE CIRCUIT)

(a) Disconnect the G41 navigation receiver assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G41-2 (R+B1) - Body ground

Ignition switch ACC

Radio switch on and AM or FM selected

11 to 14 V

Text in Illustration

*a	Component without harness connected (Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

6.	REPLACE AMPLIFIER ANTENNA ASSEMBLY

(a) Replace the amplifier antenna assembly and check if radio broadcasts can be received normally (See page ).

OK:

Radio broadcasts can be received normally.

NORMAL OPERATION

7.	REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY

(a) Replace the No. 2 antenna cord sub-assembly and check if radio broadcasts can be received normally (See page ).

OK:

Radio broadcasts can be received normally.

NORMAL OPERATION

8.	REPLACE NO. 2 INSTRUMENT PANEL WIRE

(a) Replace the No. 2 instrument panel wire and check if radio broadcasts can be received normally (See page ).

OK:

Radio broadcasts can be received normally.

NORMAL OPERATION

REPLACE NAVIGATION RECEIVER ASSEMBLY

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