Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Stereo Component Amplifier Disconnected (B15D3)
DESCRIPTION
The radio receiver assembly and stereo component amplifier assembly are connected via MOST communication lines.
When a MOST communication error occurs between the radio receiver assembly and stereo component amplifier assembly, this DTC will be stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B15D3 | Stereo Component Amplifier Disconnected | A device that is listed in the MOST network connected device record of the master unit is missing. |
|
HINT:
For the MOST network, the radio receiver assembly is the master unit.
WIRING DIAGRAM
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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- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK DTC |
(a) If DTC B15C3 is output, perform troubleshooting for DTC B15C3 first.
| Result | Proceed to |
|---|---|
| DTC B15C3 is not output. | A |
| DTC B15C3 is output. | B |
| B |  | GO TO DTC B15C3 |
|
| 2. | CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING) |
(a) Check that optional components (including associated wiring) which generate radio waves are not installed.
| Result | Proceed to |
|---|---|
| Optional components (including associated wiring) are installed. | A |
| Optional components (including associated wiring) are not installed. | B |
HINT:
- Electrical noise from radio waves generated by optional components or the wiring for those components may affect MOST communication.
- This DTC may be stored when a MOST communication error occurs due to electrical noise.
| B | | GO TO STEP 4 |
|
| 3. | REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING) |
(a) Remove optional components (including associated wiring).
NOTICE:
Do not remove optional components or associated wiring without the permission of the customer.
|
| 4. | CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs(b) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble CodesOK:
No DTCs are output.
| OK | | END |
|
| 5. | CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY POWER SOURCE) |
(a) Disconnect the J66 stereo component amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J66-3 (GND) - Body ground | Always | Below 1 Ω |
| J66-18 (GND2) - 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 |
|---|---|---|
| J66-1 (+B) - J66-3 (GND) | Always | 11 to 14 V |
| J66-16 (+B2) - J66-3 (GND) | Always | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
(a) Disconnect the J122 radio receiver assembly connector.
(b) Disconnect the J123 stereo component amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J122-5 (MO+) - J123-2 (MI+) | Always | Below 1 Ω |
| J122-6 (MO-) - J123-3 (MI-) | Always | Below 1 Ω |
| J122-7 (SLDO) - J123-4 (SLDI) | Always | Below 1 Ω |
| J122-2 (MI+) - J123-5 (MO+) | Always | Below 1 Ω |
| J122-3 (MI-) - J123-6 (MO-) | Always | Below 1 Ω |
| J122-4 (SLDI) - J123-7 (SLDO) | Always | Below 1 Ω |
| J122-5 (MO+) or J123-2 (MI+) - Body ground | Always | 10 kΩ or higher |
| J122-6 (MO-) or J123-3 (MI-) - Body ground | Always | 10 kΩ or higher |
| J122-7 (SLDO) or J123-4 (SLDI) - Body ground | Always | 10 kΩ or higher |
| J122-2 (MI+) or J123-5 (MO+) - Body ground | Always | 10 kΩ or higher |
| J122-3 (MI-) or J123-6 (MO-) - Body ground | Always | 10 kΩ or higher |
| J122-4 (SLDI) or J123-7 (SLDO) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY |
(a) Replace the stereo component amplifier assembly with a new or known good one.
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(b) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs(c) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble CodesOK:
No DTCs are output.
| OK | | END |
| NG | | REPLACE RADIO RECEIVER ASSEMBLY |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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