Lexus NX: Stereo Component Amplifier Disconnected (B15D3)
DESCRIPTION
The radio receiver assembly and stereo component amplifier assembly are connected by the MOST communication line.
This DTC is stored when a MOST communication error occurs between the radio receiver assembly and stereo component amplifier assembly.
| 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 communication line, the radio receiver assembly is the master unit.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
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 DTC |
(a) If DTC B15C3 is output, perform troubleshooting for DTC B15C3 first.
Body Electrical > Navigation System > Trouble CodesOK:
DTC B15C3 is not output.
| NG | .gif) | GO TO DTC B15C3 |
|
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| 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 5 |
|
| 3. | REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING) (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.
Click here
(b) Recheck for DTCs and check that no DTCs are output.
Click here
OK:
No DTCs are output.
| OK | | END (COMMUNICATION MALFUNCTION DUE TO NOISE) |
|
| 5. | CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - BATTERY AND BODY GROUND) |
| (a) Disconnect the 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 |
|---|---|---|
| P22-3 (GND) - Body ground | Always | Below 1 Ω |
| P22-18 (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 |
|---|---|---|
| *: for 14 Speakers | ||
| P22-1 (+B) - Body ground* | Power switch off | 11 to 14 V |
| P22-16 (+B2) - Body ground | Power switch off | 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 I102 radio receiver assembly connector.
(b) Disconnect the P29 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 |
|---|---|---|
| I102-2 (MI+) - P29-5 (MO+) | Always | Below 1 Ω |
| I102-3 (MI-) - P29-6 (MO-) | Always | Below 1 Ω |
| I102-4 (SLDI) - P29-7 (SLDO) | Always | Below 1 Ω |
| I102-5 (MO+) - P29-2 (MI+) | Always | Below 1 Ω |
| I102-6 (MO-) - P29-3 (MI-) | Always | Below 1 Ω |
| I102-7 (SLDO) - P29-4 (SLDI) | Always | Below 1 Ω |
| I102-2 (MI+) - Body ground | Always | 10 kΩ or higher |
| I102-3 (MI-) - Body ground | Always | 10 kΩ or higher |
| I102-4 (SLDI) - Body ground | Always | 10 kΩ or higher |
| I102-5 (MO+) - Body ground | Always | 10 kΩ or higher |
| I102-6 (MO-) - Body ground | Always | 10 kΩ or higher |
| I102-7 (SLDO) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY |
(a) Replace the stereo component amplifier assembly with a new or known good one.
Click here
(b) Clear the DTCs.
Click here
(c) Recheck for DTCs and check that no DTCs are output.
Click here
OK:
No DTCs are output.
| OK | | END (STEREO COMPONENT AMPLIFIER ASSEMBLY IS DEFECTIVE) |
| NG | | REPLACE RADIO RECEIVER ASSEMBLY |
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