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 Navigation System.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (SPEAKER CIRCUIT) |
-
*1: for LH Side
*2: for RH Side
*3: for 14 Speakers
*4: w/ Manual (SOS) Switch
(a) Disconnect the P22 stereo component amplifier assembly connector.
(b) Disconnect the M9*1 and/or L9*2 front No. 1 speaker assembly connector.
(c) Disconnect the J2*1 and/or J1*2 front No. 2 speaker assembly connector.
(d) Disconnect the J3 front No. 3 speaker assembly connector.
(e) Disconnect the O6*1 and/or N5*2 rear No. 2 speaker assembly connector.
(f) Disconnect the O5*1 and/or N6*2 rear speaker assembly connector.
(g) Disconnect the Y20 rear No. 3 speaker assembly connector.
(h) Disconnect the Q19*1 and/or P17*2 rear header speaker assembly connector.*3
(i) Disconnect the I184 DCM (telematics transceiver) connector.*4
(j) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for LH Side| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P22-4 (WFL+) - M9-1 | Always | Below 1 Ω |
| P22-19 (WFL-) - M9-2 | Always | Below 1 Ω |
| P22-12 (FL+) - J2-2 | Always | Below 1 Ω |
| P22-27 (FL-) - J2-1 | Always | Below 1 Ω |
| P22-8 (RL+) - O6-3 (+TW) | Always | Below 1 Ω |
| P22-23 (RL-) - O6-1 (-TW) | Always | Below 1 Ω |
| O6-4 (+) - O5-1 | Always | Below 1 Ω |
| O6-2 (-) - O5-2 | Always | Below 1 Ω |
| P22-10 (SL+) - Q19-2*3 | Always | Below 1 Ω |
| P22-25 (SL-) - Q19-1*3 | Always | Below 1 Ω |
| P22-4 (WFL+) - Body ground | Always | 10 kΩ or higher |
| P22-19 (WFL-) - Body ground | Always | 10 kΩ or higher |
| P22-12 (FL+) - Body ground | Always | 10 kΩ or higher |
| P22-27 (FL-) - Body ground | Always | 10 kΩ or higher |
| P22-8 (RL+) - Body ground | Always | 10 kΩ or higher |
| P22-23 (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 |
| P22-10 (SL+) - Body ground*3 | Always | 10 kΩ or higher |
| P22-25 (SL-) - Body ground*3 | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P22-5 (WFR+) - L9-1 | Always | Below 1 Ω |
| P22-20 (WFR-) - L9-2 | Always | Below 1 Ω |
| P22-13 (FR+) - I184-1 (SPI+) | Always | Below 1 Ω |
| P22-28 (FR-) - I184-2 (SPI-) | Always | Below 1 Ω |
| I184-3 (SPO+) - J1-2 | Always | Below 1 Ω |
| I184-4 (SPO-) - J1-1 | Always | Below 1 Ω |
| P22-9 (RR+) - N5-3 (+TW) | Always | Below 1 Ω |
| P22-24 (RR-) - N5-1 (-TW) | Always | Below 1 Ω |
| N5-4 (+) - N6-1 | Always | Below 1 Ω |
| N5-2 (-) - N6-2 | Always | Below 1 Ω |
| P22-11 (SR+) - P17-2*3 | Always | Below 1 Ω |
| P22-26 (SR-) - P17-1*3 | Always | Below 1 Ω |
| P22-5 (WFR+) - Body ground | Always | 10 kΩ or higher |
| P22-20 (WFR-) - Body ground | Always | 10 kΩ or higher |
| P22-13 (FR+) - Body ground | Always | 10 kΩ or higher |
| P22-28 (FR-) - 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 |
| P22-9 (RR+) - Body ground | Always | 10 kΩ or higher |
| P22-24 (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 |
| P22-11 (SR+) - Body ground*3 | Always | 10 kΩ or higher |
| P22-26 (SR-) - Body ground*3 | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P22-5 (WFR+) - L9-1 | Always | Below 1 Ω |
| P22-20 (WFR-) - L9-2 | Always | Below 1 Ω |
| P22-13 (FR+) - J1-2 | Always | Below 1 Ω |
| P22-28 (FR-) - J1-1 | Always | Below 1 Ω |
| P22-9 (RR+) - N5-3 (+TW) | Always | Below 1 Ω |
| P22-24 (RR-) - N5-1 (-TW) | Always | Below 1 Ω |
| N5-4 (+) - N6-1 | Always | Below 1 Ω |
| N5-2 (-) - N6-2 | Always | Below 1 Ω |
| P22-11 (SR+) - P17-2*3 | Always | Below 1 Ω |
| P22-26 (SR-) - P17-1*3 | Always | Below 1 Ω |
| P22-5 (WFR+) - Body ground | Always | 10 kΩ or higher |
| P22-20 (WFR-) - Body ground | Always | 10 kΩ or higher |
| P22-13 (FR+) - Body ground | Always | 10 kΩ or higher |
| P22-28 (FR-) - Body ground | Always | 10 kΩ or higher |
| P22-9 (RR+) - Body ground | Always | 10 kΩ or higher |
| P22-24 (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 |
| P22-11 (SR+) - Body ground*3 | Always | 10 kΩ or higher |
| P22-26 (SR-) - Body ground*3 | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P22-7 (CTR+) - J3-2 | Always | Below 1 Ω |
| P22-22 (CTR-) - J3-1 | Always | Below 1 Ω |
| P22-6 (WF1+) - Y20-1 | Always | Below 1 Ω |
| P22-21 (WF1-) - Y20-2 | Always | Below 1 Ω |
| P22-7 (CTR+) - Body ground | Always | 10 kΩ or higher |
| P22-22 (CTR-) - Body ground | Always | 10 kΩ or higher |
| P22-6 (WF1+) - Body ground | Always | 10 kΩ or higher |
| P22-21 (WF1-) - 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 FRONT NO. 3 SPEAKER ASSEMBLY |
(a) Remove the front No. 3 speaker assembly.
Click here
(b) Inspect the front No. 3 speaker assembly.
Click here
| NG | | REPLACE FRONT NO. 3 SPEAKER ASSEMBLY |
|
| 5. | 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 |
|
| 6. | INSPECT REAR NO. 3 SPEAKER ASSEMBLY |
(a) Remove the rear No. 3 speaker assembly.
Click here
(b) Inspect the rear No. 3 speaker assembly.
Click here
| NG | | REPLACE REAR NO. 3 SPEAKER ASSEMBLY |
|
| 7. | CHECK VEHICLE TYPE |
(a) Check the vehicle type.
| Result | Proceed to |
|---|---|
| for 14 Speakers | A |
| for 10 Speakers | B |
| B | | GO TO STEP 9 |
|
| 8. | INSPECT REAR HEADER SPEAKER ASSEMBLY |
(a) Remove the rear header speaker assembly.
Click here
(b) Inspect the rear header speaker assembly.
Click here
| NG | | REPLACE REAR HEADER SPEAKER ASSEMBLY |
|
| 9. | 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 11 |
|
| 10. | INSPECT DCM (TELEMATICS TRANSCEIVER) (SPO+, SPO-, SPI+, SPI-) |
| (a) Remove the DCM (telematics transceiver). Click here |
|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I184-1 (SPI+) - I184-3 (SPO+) | Always | Below 1 Ω |
| I184-2 (SPI-) - I184-4 (SPO-) | Always | Below 1 Ω |
| I184-1 (SPI+) - I184-2 (SPI-) | Always | 10 kΩ or higher |
| I184-3 (SPO+) - I184-4 (SPO-) | Always | 10 kΩ or higher |
| NG | | REPLACE DCM (TELEMATICS TRANSCEIVER) |
|
| 11. | 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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