Last Modified: 11-29-2007 1.6 J
Service Category: Audio/Visual/Telematics Section: Audio/Video
Model Year: 2008 Model: Sequoia Doc ID: RM000001XJI013X
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: DESCRIPTION (2008 Sequoia)

Speaker Circuit (Built-in 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 FRONT SIDE SPEAKER

(a) Check the malfunctioning speakers.

Result

Result

Proceed to

Front No. 2 speaker assembly

A

Front No. 1 speaker assembly

B
A

3.

INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Disconnect the I11*1 and I13*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

3.6 to 4.4 Ω

for RH Side

Tester Connection

Condition

Specified Condition

1 (+) - 3 (TWR+)

Always

Below 1 Ω

2 (-) - 4 (TWR-)

3 (TWR+) - 4 (TWR-)

Always

3.6 to 4.4 Ω

(c) Reconnect the speaker connectors.

OK

4.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY)

(a) Disconnect the I1 radio receiver assembly connector.

(b) Disconnect the I11*1 and I13*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

I1-2 (FL+) - I13-3 (TWL+)

Always

Below 1 Ω

I1-6 (FL-) - I13-4 (TWL-)

I1-2 (FL+) - Body ground

Always

10 kΩ or higher

I1-6 (FL-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

I1-1 (FR+) - I11-3 (TWR+)

Always

Below 1 Ω

I1-5 (FR-) - I11-4 (TWR-)

I1-1 (FR+) - Body ground

Always

10 kΩ or higher

I1-5 (FR-) - Body ground

(d) Reconnect the radio receiver assembly connector.

(e) Reconnect the speaker connectors.

OK

5.

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

3.2 to 4.8 Ω

(c) Reconnect the speaker connectors.

OK

6.

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

(a) Disconnect the L8*1, M10*2, I11*1 and I13*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

I13-1 (+) - M10-1

Always

Below 1 Ω

I13-2 (-) - M10-2

I13-1 (+) - Body ground

Always

10 kΩ or higher

I13-2 (-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

I11-1 (+) - L8-1

Always

Below 1 Ω

I11-2 (-) - L8-2

I11-1 (+) - Body ground

Always

10 kΩ or higher

I11-2 (-) - Body ground

(c) Reconnect the speaker connectors.

OK

7.

CHECK REAR SIDE SPEAKER

(a) Check the malfunctioning speakers.

Result

Result

Proceed to

Quarter side speaker assembly

A

Rear No. 1 speaker assembly

B
A

8.

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(+) - 3(+)

Always

Below 1 Ω

2(-) - 4(-)

1(+) - 2(-)

Always

3.6 to 4.4 Ω

(c) Reconnect the speaker connectors.

OK

9.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - QUARTER SIDE SPEAKER ASSEMBLY)

(a) Disconnect the I2 radio receiver assembly connector.

(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:

for LH Side

Tester Connection

Condition

Specified Condition

I2-2 (RL+) - O31-1(+)

Always

Below 1 Ω

I2-6 (RL-) - O31-2(-)

I2-2 (RL+) - Body ground

Always

10 kΩ or higher

I2-6 (RL-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

I2-1 (RR+) - O37-1(+)

Always

Below 1 Ω

I2-3 (RR-) - O37-2(-)

I2-1 (RR+) - Body ground

Always

10 kΩ or higher

I2-3 (RR-) - Body ground

(d) Reconnect the radio receiver assembly connector.

(e) Reconnect the speaker connectors.

OK

10.

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

3.2 to 4.8 Ω

(c) Reconnect the speaker connectors.

OK

11.

CHECK HARNESS AND CONNECTOR (QUARTER SIDE SPEAKER ASSEMBLY - REAR NO.1 SPEAKER ASSEMBLY)

(a) Disconnect the N1*1, N7*2, 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:

for LH Side

Tester Connection

Condition

Specified Condition

O31-3(+) - N7-1

Always

Below 1 Ω

O31-4(-) - N7-2

O31-3(+) - Body ground

Always

10 kΩ or higher

O31-4(-) - Body ground

for RH Side

Tester Connection

Condition

Specified Condition

O37-3(+) - N1-1

Always

Below 1 Ω

O37-4(-) - N1-2

O37-3(+) - Body ground

Always

10 kΩ or higher

O37-4(-) - Body ground

(c) Reconnect the speaker connectors.

OK