Lexus NX: Radio Broadcast cannot be Received or Poor Reception

Lexus NX Service Manual / Audio & Visual & Telematics / Audio / Video / Audio And Visual System / Radio Broadcast cannot be Received or Poor Reception

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the radio receiver assembly, always replace it with a new one.

If a radio receiver assembly which was installed to another vehicle is used, the following may occur:

  • A communication malfunction DTC may be stored.
  • The radio receiver assembly may not operate normally.

HINT:

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.

Click here

PROCEDURE

1.

CHECK RADIO RECEIVER ASSEMBLY

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

OK:

Automatic station search function stops on a station.

OK

USE SIMULATION METHOD TO CHECK

NG

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 not installed.

NOTICE:

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

NG

REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)

OK

3.

CHECK RADIO RECEIVER ASSEMBLY

(a) Preparation for check

(1) Disconnect the RA radio receiver assembly connector.

(b) Check for noise

(1) Turn the power switch on (ACC) with the radio receiver assembly connector connected.

(2) Turn the radio receiver assembly on and enter AM mode.

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

OK:

Noise can be heard from the speakers.

NG

REPLACE RADIO RECEIVER ASSEMBLY

OK

4.

CHECK BACK WINDOW GLASS (WINDOW GLASS ANTENNA WIRE)

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

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 tin 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 window glass antenna wire.

*a

Tester Probe

*b

Antenna Wire

*c

Tin Foil

NG

REPAIR BACK WINDOW GLASS (WINDOW GLASS ANTENNA WIRE)

OK

5.

INSPECT RADIO RECEIVER ASSEMBLY

(a) Disconnect the RA radio receiver assembly connector.

(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

Power switch on (ACC), radio switch on and FM or AM selected

11 to 14 V

NG

REPLACE RADIO RECEIVER ASSEMBLY

OK

6.

CHECK NO. 1 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly.

*a

Front view of wire harness connector

(to No. 2 Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to Radio Receiver Assembly)

(b) Disconnect the antenna connector from the radio receiver assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E-3 - RA-3 (MAIN)

Always

Below 1 Ω

E-3a - RA-4

Always

Below 1 Ω

E-4 - RA-1 (SUB)

Always

Below 1 Ω

E-4a - RA-2

Always

Below 1 Ω

E-1 - RA-5 (ANT+)

Always

Below 1 Ω

E-3 - Body ground

Always

10 kΩ or higher

E-3a - Body ground

Always

10 kΩ or higher

E-4 - Body ground

Always

10 kΩ or higher

E-4a - Body ground

Always

10 kΩ or higher

E-1 - Body ground

Always

10 kΩ or higher

NG

REPLACE NO. 1 ANTENNA CORD SUB-ASSEMBLY

OK

7.

CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the antenna connector from the No. 4 antenna cord sub-assembly.

*a

Front view of wire harness connector

(to No. 3 Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to No. 4 Antenna Cord Sub-assembly)

(b) Disconnect the antenna connector from the No. 1 antenna cord sub-assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D-1 - E-3

Always

Below 1 Ω

D-1a - E-3a

Always

Below 1 Ω

D-2 - E-4

Always

Below 1 Ω

D-2a - E-4a

Always

Below 1 Ω

D-3 - E-1

Always

Below 1 Ω

D-1 - Body ground

Always

10 kΩ or higher

D-1a - Body ground

Always

10 kΩ or higher

D-2 - Body ground

Always

10 kΩ or higher

D-2a - Body ground

Always

10 kΩ or higher

D-3 - Body ground

Always

10 kΩ or higher

NG

REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY

OK

8.

CHECK NO. 4 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the antenna connector from the No. 5 antenna cord sub-assembly.

*a

Front view of wire harness connector

(to No. 5 Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to No. 2 Antenna Cord Sub-assembly)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C-1 - D-1

Always

Below 1 Ω

C-1a - D-1a

Always

Below 1 Ω

C-2 - D-2

Always

Below 1 Ω

C-2a - D-2a

Always

Below 1 Ω

C-3 - D-3

Always

Below 1 Ω

C-1 - Body ground

Always

10 kΩ or higher

C-1a - Body ground

Always

10 kΩ or higher

C-2 - Body ground

Always

10 kΩ or higher

C-2a - Body ground

Always

10 kΩ or higher

C-3 - Body ground

Always

10 kΩ or higher

NG

REPLACE NO. 4 ANTENNA CORD SUB-ASSEMBLY

OK

9.

CHECK NO. 5 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the antenna connector from the rear spoiler sub-assembly.

*a

Front view of wire harness connector

(to Rear Spoiler Sub-assembly)

*b

Front view of wire harness connector

(to No. 1 Amplifier Antenna Assembly)

*c

Front view of wire harness connector

(to No. 4 Antenna Cord Sub-assembly)

(b) Disconnect the antenna connector from the No. 1 amplifier antenna assembly.

(c) Disconnect the antenna connector from the No. 4 antenna cord sub-assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-3 - C-1

Always

Below 1 Ω

A-3a - C-1a

Always

Below 1 Ω

A-2 - C-3

Always

Below 1 Ω

B-1 - C-2

Always

Below 1 Ω

B-1a - C-2a

Always

Below 1 Ω

B-2 - C-3

Always

Below 1 Ω

A-3 - Body ground

Always

10 kΩ or higher

A-3a - Body ground

Always

10 kΩ or higher

A-2 - Body ground

Always

10 kΩ or higher

B-1 - Body ground

Always

10 kΩ or higher

B-1a - Body ground

Always

10 kΩ or higher

B-2 - Body ground

Always

10 kΩ or higher

NG

REPLACE NO. 5 ANTENNA CORD SUB-ASSEMBLY

OK

10.

CHECK NO. 1 AMPLIFIER ANTENNA ASSEMBLY

(a) Replace the No. 1 amplifier antenna assembly with a new or known good one.

Click here

OK:

Radio broadcasts can be received normally.

OK

END (NO. 1 AMPLIFIER ANTENNA ASSEMBLY IS DEFECTIVE)

NG

11.

CHECK REAR SPOILER SUB-ASSEMBLY

(a) Replace the rear spoiler sub-assembly with a new or known good one.

Click here

OK:

Radio broadcasts can be received normally.

OK

END (REAR SPOILER SUB-ASSEMBLY IS DEFECTIVE)

NG

REPLACE RADIO RECEIVER ASSEMBLY

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