Lexus NX: Speaker Circuit
DESCRIPTION
If there is a short in a speaker circuit, the stereo component amplifier assembly detects it and stops output to the speakers.
As a result, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, DCM (telematics transceiver)* or speakers.
- *: w/ Manual (SOS) Switch
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
When replacing the DCM (telematics transceiver), make sure to replace it with a new one (w/ Manual [SOS] Switch).
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.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT) |
-
*1: for LH Side
*2: for RH Side
*3: w/ Manual (SOS) Switch
(a) Disconnect the P32 stereo component amplifier assembly connector.
(b) Disconnect the M9*1 and/or L9*2 front No. 1 speaker assembly connector.
(c) Disconnect the J9*1 and/or J8*2 front No. 2 speaker assembly connector.
(d) Disconnect the O6*1 and/or N5*2 rear No. 2 speaker assembly connector.
(e) Disconnect the O5*1 and/or N6*2 rear speaker assembly connector.
(f) Disconnect the I184 DCM (telematics transceiver) connector.*3
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for LH Side| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P32-4 (WFL+) - M9-1 | Always | Below 1 Ω |
| P32-19 (WFL-) - M9-2 | Always | Below 1 Ω |
| P32-12 (FL+) - J9-4 | Always | Below 1 Ω |
| P32-27 (FL-) - J9-2 | Always | Below 1 Ω |
| P32-8 (RL+) - O6-3 (+TW) | Always | Below 1 Ω |
| P32-23 (RL-) - O6-1 (-TW) | Always | Below 1 Ω |
| O6-4 (+) - O5-1 | Always | Below 1 Ω |
| O6-2 (-) - O5-2 | Always | Below 1 Ω |
| P32-4 (WFL+) - Body ground | Always | 10 kΩ or higher |
| P32-19 (WFL-) - Body ground | Always | 10 kΩ or higher |
| P32-12 (FL+) - Body ground | Always | 10 kΩ or higher |
| P32-27 (FL-) - Body ground | Always | 10 kΩ or higher |
| P32-8 (RL+) - Body ground | Always | 10 kΩ or higher |
| P32-23 (RL-) - Body ground | Always | 10 kΩ or higher |
| O6-4 (+) - Body ground | Always | 10 kΩ or higher |
| O6-2 (-) - Body ground | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P32-5 (WFR+) - I184-1 (SPI+) | Always | Below 1 Ω |
| P32-20 (WFR-) - I184-2 (SPI-) | Always | Below 1 Ω |
| I184-3 (SPO+) - L9-1 | Always | Below 1 Ω |
| I184-4 (SPO-) - L9-2 | Always | Below 1 Ω |
| P32-13 (FR+) - J8-4 | Always | Below 1 Ω |
| P32-28 (FR-) - J8-2 | Always | Below 1 Ω |
| P32-9 (RR+) - N5-3 (+TW) | Always | Below 1 Ω |
| P32-24 (RR-) - N5-1 (-TW) | Always | Below 1 Ω |
| N5-4 (+) - N6-1 | Always | Below 1 Ω |
| N5-2 (-) - N6-2 | Always | Below 1 Ω |
| P32-5 (WFR+) - Body ground | Always | 10 kΩ or higher |
| P32-20 (WFR-) - Body ground | Always | 10 kΩ or higher |
| I184-3 (SPO+) - Body ground | Always | 10 kΩ or higher |
| I184-4 (SPO-) - Body ground | Always | 10 kΩ or higher |
| P32-13 (FR+) - Body ground | Always | 10 kΩ or higher |
| P32-28 (FR-) - Body ground | Always | 10 kΩ or higher |
| P32-9 (RR+) - Body ground | Always | 10 kΩ or higher |
| P32-24 (RR-) - Body ground | Always | 10 kΩ or higher |
| N5-4 (+) - Body ground | Always | 10 kΩ or higher |
| N5-2 (-) - Body ground | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P32-5 (WFR+) - L9-1 | Always | Below 1 Ω |
| P32-20 (WFR-) - L9-2 | Always | Below 1 Ω |
| P32-13 (FR+) - J8-4 | Always | Below 1 Ω |
| P32-28 (FR-) - J8-2 | Always | Below 1 Ω |
| P32-9 (RR+) - N5-3 (+TW) | Always | Below 1 Ω |
| P32-24 (RR-) - N5-1 (-TW) | Always | Below 1 Ω |
| N5-4 (+) - N6-1 | Always | Below 1 Ω |
| N5-2 (-) - N6-2 | Always | Below 1 Ω |
| P32-5 (WFR+) - Body ground | Always | 10 kΩ or higher |
| P32-20 (WFR-) - Body ground | Always | 10 kΩ or higher |
| P32-13 (FR+) - Body ground | Always | 10 kΩ or higher |
| P32-28 (FR-) - Body ground | Always | 10 kΩ or higher |
| P32-9 (RR+) - Body ground | Always | 10 kΩ or higher |
| P32-24 (RR-) - Body ground | Always | 10 kΩ or higher |
| N5-4 (+) - Body ground | Always | 10 kΩ or higher |
| N5-2 (-) - Body ground | Always | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | INSPECT FRONT NO. 1 SPEAKER ASSEMBLY |
(a) Remove the front No. 1 speaker assembly.
Click here
(b) Inspect the front No. 1 speaker assembly.
Click here
| NG | | REPLACE FRONT NO. 1 SPEAKER ASSEMBLY |
|
| 3. | INSPECT FRONT NO. 2 SPEAKER ASSEMBLY |
(a) Remove the front No. 2 speaker assembly.
Click here
(b) Inspect the front No. 2 speaker assembly.
Click here
| NG | | REPLACE FRONT NO. 2 SPEAKER ASSEMBLY |
|
| 4. | INSPECT REAR SPEAKER ASSEMBLY |
(a) Remove the rear speaker assembly.
Click here
(b) Inspect the rear speaker assembly.
Click here
| NG | | REPLACE REAR SPEAKER ASSEMBLY |
|
| 5. | CHECK VEHICLE TYPE |
(a) Check the vehicle type.
| Result | Proceed to |
|---|---|
| w/ Manual (SOS) Switch | A |
| w/o Manual (SOS) Switch | B |
| B | | GO TO STEP 7 |
|
| 6. | INSPECT DCM (TELEMATICS TRANSCEIVER) (SPO+, SPO-, SPI+, SPI-) |
(a) Remove the DCM (telematics transceiver).
Click here
| (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG | | REPLACE DCM (TELEMATICS TRANSCEIVER) |
|
| 7. | CHECK REAR NO. 2 SPEAKER ASSEMBLY |
(a) Replace the rear No. 2 speaker assembly with a new or known good one.
Click here
(b) Check the malfunction disappears.
OK:
Malfunction disappears.
HINT:
- Connect all the connectors to the rear No. 2 speaker assemblies that were disconnected.
- When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
- Perform the above inspection on both the LH and RH sides.
| OK | | END (REAR NO. 2 SPEAKER ASSEMBLY IS DEFECTIVE) |
| NG | | REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY |
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SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS (a) Interview the customer and confirm the problem. Click here
NEXT 3. INSPECT AUXILIARY BATTERY VOLTAGE
Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. PRECAUTION NOTICE: After the power switch off is turned off, there may be a waiting time before disconnecting the auxiliary negative (-) battery t
