Last Modified: 11-29-2007 1.6 J
Service Category: Audio/Visual/Telematics Section: Audio/Video
Model Year: 2008 Model: Sequoia Doc ID: RM000001XJI012X
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: DESCRIPTION (2008 Sequoia)

Speaker Circuit (Independent Amplifier)

DESCRIPTION

The stereo component amplifier assembly sends sound signals to the speaker.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK SPEAKER

(a) Check the malfunctioning speakers.

Result

Result

Proceed to

Malfunction in front speaker area

A

Malfunction in rear speaker area

B
A

2.

CHECK SPEAKER

(a) Check the malfunctioning speakers.

Result

Result

Proceed to

Front No. 1 speaker assembly

A

Front No. 2 speaker assembly

B

Front No. 3 speaker assembly

C

Front No. 4 speaker assembly

D
A

3.

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Disconnect the L8*1 and M10*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Always

1.8 to 2.6 Ω

(c) Reconnect the speaker connectors.

OK

4.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - FRONT NO. 1 SPEAKER)

(a) Disconnect the L8*1 and M10*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Disconnect the I18 stereo component amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH Side

Tester Connection

Condition

Specified Condition

I18-1 (WFL+) - M10-1

Always

Below 1 Ω

I18-5 (WFL-) - M10-2

I18-1 (WFL+) - Body ground

Always

10 kΩ or higher

I18-5 (WFL-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

I18-2 (WFR+) - L8-1

Always

Below 1 Ω

I18-6 (WFR-) - L8-2

I18-2 (WFR+) - Body ground

Always

10 kΩ or higher

I18-6 (WFR-) - Body ground

(d) Reconnect the speaker connector.

(e) Reconnect the stereo component amplifier assembly connector.

OK

5.

INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Disconnect the I10*1 and I12*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH Side

Tester Connection

Condition

Specified Condition

1 (+) - 3 (TWL+)

Always

Below 1 Ω

2 (-) - 4 (TWL-)

3 (TWL+) - 4 (TWL-)

Always

1.5 to 2.5 Ω

for RH Side

Tester Connection

Condition

Specified Condition

1 (+) - 3 (TWR+)

Always

Below 1 Ω

2 (-) - 4 (TWR-)

3 (TWR+) - 4 (TWR-)

Always

1.5 to 2.5 Ω

(c) Reconnect the speaker connector.

OK

6.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 2 SPEAKER)

(a) Disconnect the I19 stereo component amplifier assembly connector.

(b) Disconnect the I10*1 and I12*2 speaker connectors.

HINT:

*1: for RH Side

*2: for LH Side

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH Side

Tester Connection

Condition

Specified Condition

I19-3 (FL+) - I12-3 (TWL+)

Always

Below 1 Ω

I19-8 (FL-) - I12-4 (TWL-)

I19-3 (FL+) - Body ground

Always

10 kΩ or higher

I19-8 (FL-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

I19-10 (FR+) - I10-3 (TWR+)

Always

Below 1 Ω

I19-9 (FR-) - I10-4 (TWR-)

I19-10 (FR+) - Body ground

Always

10 kΩ or higher

I19-9 (FR-) - Body ground

(d) Reconnect the stereo component amplifier assembly connector.

(e) Reconnect the speaker connector.

OK

7.

INSPECT FRONT NO. 3 SPEAKER ASSEMBLY

(a) Disconnect the L1*1 and M1*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 3

Always

3.0 to 4.2 Ω

(c) Reconnect the speaker connector.

OK

8.

CHECK HARNESS AND CONNECTOR (FRONT NO. 2 SPEAKER - FRONT NO. 3 SPEAKER)

(a) Disconnect the L1*1, M1*2, I10*1 and I12*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH Side

Tester Connection

Condition

Specified Condition

I12-1 (+) - M1-3

Always

Below 1 Ω

I12-2 (-) - M1-1

I12-1 (+) - Body ground

Always

10 kΩ or higher

I12-2 (-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

I10-1 (+) - L1-3

Always

Below 1 Ω

I10-2 (-) - L1-1

I10-1 (+) - Body ground

Always

10 kΩ or higher

I10-2 (-) - Body ground

(c) Reconnect the speaker connectors.

OK

9.

INSPECT FRONT NO. 4 SPEAKER ASSEMBLY

(a) Disconnect the I14 speaker connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Always

1.5 to 2.1 Ω

(c) Reconnect the speaker connector.

OK

10.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - FRONT NO. 4 SPEAKER)

(a) Disconnect the I14 speaker connector.

(b) Disconnect the I18 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

I18-3 (CTR+) - I14-1

Always

Below 1 Ω

I18-9 (CTR-) - I14-2

I18-3 (CTR+) - Body ground

Always

10 kΩ or higher

I18-9 (CTR-) - Body ground

(d) Reconnect the speaker connector.

(e) Reconnect the stereo component amplifier assembly connector.

OK

11.

CHECK SPEAKER

(a) Check the malfunctioning speakers.

Result

Result

Proceed to

Rear No. 2 speaker assembly

A

Rear No. 1 speaker assembly

B

Quarter side speaker assembly

C

w/ Box No. 1 speaker assembly

D
A

12.

INSPECT REAR NO. 2 SPEAKER ASSEMBLY

(a) Disconnect the N2*1 and N8*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (-TW) - 3 (+TW)

Always

3.0 to 4.2 Ω

1 (-TW) - 2 (-)

Always

Below 1 Ω

3 (+TW) - 4 (+)

(c) Reconnect the speaker connectors.

OK

13.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - REAR NO. 2 SPEAKER)

(a) Disconnect the I19 stereo component amplifier assembly connector.

(b) Disconnect the N2*1 and N8*2 speaker connectors.

HINT:

*1: for RH Side

*2: for LH Side

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH Side

Tester Connection

Condition

Specified Condition

I19-4 (RL+) - N8-3 (+TW)

Always

Below 1 Ω

I19-11 (RL-) - N8-1 (-TW)

I19-4 (RL+) - Body ground

Always

10 kΩ or higher

I19-11 (RL-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

I19-5 (RR+) - N2-3 (+TW)

Always

Below 1 Ω

I19-12 (RR-) - N2-1 (-TW)

I19-5 (RR+) - Body ground

Always

10 kΩ or higher

I19-12 (RR-) - Body ground

(d) Reconnect the stereo component amplifier assembly.

(e) Reconnect the speaker connectors.

OK

14.

INSPECT REAR NO. 1 SPEAKER ASSEMBLY

(a) Disconnect the N1*1 and N7*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Always

1.5 to 2.1 Ω

(c) Reconnect the speaker connectors.

OK

15.

CHECK HARNESS AND CONNECTOR (REAR NO. 1 SPEAKER - REAR NO. 2 SPEAKER)

(a) Disconnect the N1*1, N2*1, N7*2 and N8*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH Side

Tester Connection

Condition

Specified Condition

N8-4 (+) - N7-1

Always

Below 1 Ω

N8-2 (-) - N7-2

N8-4 (+) - Body ground

Always

10 kΩ or higher

N8-2 (-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

N2-4 (+) - N1-1

Always

Below 1 Ω

N2-2 (-) - N1-2

N2-4 (+) - Body ground

Always

10 kΩ or higher

N2-2 (-) - Body ground

(c) Reconnect the speaker connectors.

OK

16.

INSPECT QUARTER SIDE SPEAKER ASSEMBLY

(a) Disconnect the O37*1 and O31*2 speaker connectors.

HINT:

*1: for RH Side

HINT:

*2: for LH Side

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Always

1.5 to 2.5 Ω

(c) Reconnect the speaker connectors.

OK

17.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - QUARTER SIDE SPEAKER)

(a) Disconnect the I18 and I19 stereo component amplifier assembly connectors.

(b) Disconnect the O37*1 and O31*2 speaker connectors.

HINT:

*1: for RH Side

*2: for LH Side

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I19-2(SR+) - O37-1(+)

Always

Below 1 Ω

I19-7(SR-) - O37-2(-)

I18-8(SL+) - O31-1(+)

I18-7(SL-) - O31-2(-)

I19-2(SR+) - Body ground

Always

10 kΩ or higher

I19-7(SR-) - Body ground

I18-8(SL+) - Body ground

I18-7(SL-) - Body ground

(d) Reconnect the stereo component amplifier assembly connectors.

(e) Reconnect the speaker connectors.

OK

18.

INSPECT W/ BOX NO.1 SPEAKER ASSEMBLY

(a) Disconnect the O13 speaker connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Always

1.5 to 2.5 Ω

(c) Reconnect the speaker connector.

OK

19.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - W/ BOX NO.1 SPEAKER)

(a) Disconnect the I18 and I19 stereo component amplifier assembly connector.

(b) Disconnect the O13 speaker connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I19-1 (WF1+) - O13-1 (WF1+)

Always

Below 1 Ω

I19-6 (WF1-) - O13-2 (WF1-)

I18-4 (WF2+) - O13-3 (WF2+)

I18-10 (WF2-) - O13-4 (WF2-)

I19-1 (WF1+) - Body ground

Always

10 kΩ or higher

I19-6 (WF1-) - Body ground

I18-4 (WF2+) - Body ground

I18-10 (WF2-) - Body ground

(d) Reconnect the stereo component amplifier assembly connectors.

(e) Reconnect the speaker connector.

OK