Last Modified: 4-30-2014 6.6 J Doc ID: RM000001AI3001X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: NAVIGATION: NAVIGATION SYSTEM: Speaker Circuit; 2006 MY LX470 [05/2005 -        ]

Speaker Circuit

DESCRIPTION

This circuit is used when the voice guidance in the navigation system is on.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY LH

(a) Disconnect the F9 speaker connector.

(b) Measure the resistance of the speaker.

Standard resistance:

Tester Connection

Specified Condition

1 - 2

Standard models: Approx. 2 Ω

NOTICE:

The speaker should not be removed for checking.

NG

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY LH

OK

2.

CHECK WIRE HARNESS (FRONT NO. 1 SPEAKER LH - NAVIGATION ECU AND BODY GROUND)

(a) Disconnect the F9 speaker connector.

(b) Disconnect the N2 ECU connector.

(c) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Specified Condition

F9-1 - N2-2 (AUO+)

Below 1 Ω

F9-2 - N2-11 (AUO-)

Below 1 Ω

F9-1 - Body ground

10 kΩ or higher

F9-2 - Body ground

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

3.

CHECK WIRE HARNESS (NAVIGATION ECU - STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the N2 ECU connector.

(b) Disconnect the S18 amplifier connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection

Specified Condition

N2-10 (AUI-) - S18-9 (FL-)

Below 1 Ω

N2-1 (AUI+) - S18-2 (FL+)

Below 1 Ω

N2-10 (AUI-) - Body ground

10 kΩ or higher

N2-1 (AUI+) - Body ground

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

4.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Using an oscilloscope, check the signal waveform between the terminals according to the conditions, shown in the chart.

OK:

Tester Connection

Condition

Specified Condition

S18-2 (FL+) - Body ground

While voice sound is being produced

A waveform synchronized with sound is output

S18-9 (FL-) - Body ground

While voice sound is being produced

A waveform synchronized with sound is output
NG

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE