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

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.

Click here

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

for RH Side (w/ Manual [SOS] Switch)

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

for RH Side (w/o Manual [SOS] Switch)

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

OK

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

OK

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

OK

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

A

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:

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

I184-1 (SPI+) - Body ground

Always

10 kΩ or higher

I184-2 (SPI-) - Body ground

Always

10 kΩ or higher

*a

Component without harness connected

(DCM [Telematics Transceiver])

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

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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