Lexus NX: Radio Broadcast cannot be Received or Poor Reception
WIRING DIAGRAM
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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 Navigation System.
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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 | .gif) | USE SIMULATION METHOD TO CHECK |
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| 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) |
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| 3. | CHECK RADIO RECEIVER ASSEMBLY |
| (a) Preparation for check (1) Disconnect the RA radio receiver assembly connector. |
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(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 |
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| 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. |
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| NG | | REPAIR BACK WINDOW GLASS (WINDOW GLASS ANTENNA WIRE) |
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| 5. | INSPECT RADIO RECEIVER ASSEMBLY |
| (a) Disconnect the RA radio receiver assembly connector. |
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(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 |
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| 6. | CHECK NO. 1 ANTENNA CORD SUB-ASSEMBLY |
| (a) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly. |
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(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 |
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| 7. | CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY |
| (a) Disconnect the antenna connector from the No. 4 antenna cord sub-assembly. |
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(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 |
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| 8. | CHECK NO. 4 ANTENNA CORD SUB-ASSEMBLY |
| (a) Disconnect the antenna connector from the No. 5 antenna cord sub-assembly. |
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(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 |
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| 9. | CHECK NO. 5 ANTENNA CORD SUB-ASSEMBLY |
| (a) Disconnect the antenna connector from the rear spoiler sub-assembly. |
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(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 |
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| 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) |
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| 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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