AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Radio Broadcast cannot be Received (Bad Reception); 2018 - 2020 MY Sienna [11/2017

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM1000000018F83
Model Year Start: 2018	Model: Sienna	Prod Date Range: [11/2017 - ]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Radio Broadcast cannot be Received (Bad Reception); 2018 - 2020 MY Sienna [11/2017 - ]

Radio Broadcast cannot be Received (Bad Reception)

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
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When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occurs:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.

PROCEDURE

1.	CHECK IF RADIO AUTO-SEARCH FUNCTIONS PROPERLY

(a) Check the radio automatic station search function.

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

OK:

Automatic station search function stops on a station.

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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.

OK:

Optional components are installed.

NOTICE:

Do not remove optional components without permission of the customer.

REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)

3.	CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY (ANTENNA)

(a) Remove the antenna connector from the radio and display receiver assembly.

(b) Turn the ignition switch to ACC with the radio and display receiver assembly connector connected.

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

OK:

Noise occurs.

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

4.	CHECK GLASS ANTENNA

(a) Check for continuity of the antenna.

HINT:

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

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 aluminum foil around the tip of each probe and press the foil against the wire with your finger, as shown in the illustration.

OK:

There is continuity in the antenna.

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

REPAIR GLASS ANTENNA

5.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

*a	Component without harness connected (Radio and Display Receiver Assembly)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
5 (ANT+) - Body ground	Ignition switch ACC, radio switch on and FM or AM selected	11 to 14 V

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

6.	CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY (ROOF HEADLINING ASSEMBLY)

(a) Disconnect the No. 2 antenna cord sub-assembly (roof headlining assembly) connector from radio and display receiver assembly.

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

Front view of wire harness connector

(to Amplifier Antenna Assembly)

(b) Disconnect the No. 2 antenna cord sub-assembly (roof headlining assembly) connector from the amplifier antenna assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 - 3 (MAIN)	Always	Below 1 Ω
3 - 1 (ANT+)	Always	Below 1 Ω
3 (MAIN) - Body ground	Always	10 kΩ or higher
1 (ANT+) - Body ground	Always	10 kΩ or higher

REPLACE ROOF HEADLINING ASSEMBLY

7.	REPLACE ANTENNA CORD SUB-ASSEMBLY

(a) Replace the antenna cord sub-assembly (for navigation antenna) with a new or known good one and check if radio broadcasts can be received normally.

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OK:

Radio broadcasts can be received normally.

REPLACE ANTENNA CORD SUB-ASSEMBLY (for NAVIGATION ANTENNA)

8.	CHECK AMPLIFIER ANTENNA ASSEMBLY

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

Click here

OK:

Radio broadcasts can be received normally.

END (AMPLIFIER ANTENNA ASSEMBLY WAS DEFECTIVE)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY