Toyota 4Runner manuals

Toyota 4Runner: Voice Recognition Microphone Disconnected (B1579)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Audio / Video / Audio And Visual System / Voice Recognition Microphone Disconnected (B1579)

DESCRIPTION

The radio and display receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

This DTC is stored when a microphone connection detection signal line is disconnected.

DTC Code

DTC Detection Condition

Trouble Area

B1579

Telephone microphone signal is lost.

  • Map light assembly
  • Telephone microphone assembly
  • Radio and display receiver assembly
  • Harness or connector

WIRING DIAGRAM


PROCEDURE

1.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G49-19 (MIN-) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Component with harness connected

(Radio and Display Receiver Assembly)



NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

(a) Disconnect the G49 radio and display receiver assembly connector.

(b) Disconnect the U2 map light assembly (telephone microphone assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G49-6 (SNS2) - U2-15 (SNS2)

Always

Below 1 Ω

G49-19 (MIN-) - U2-12 (MCO-)

Always

Below 1 Ω

G49-6 (SNS2) - Body ground

Always

10 kΩ or higher

G49-19 (MIN-) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

U2-15 (SNS2) - U2-12 (MCO-)

Always

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Map Light Assembly (Telephone Microphone Assembly))



OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

4.

REPLACE TELEPHONE MICROPHONE ASSEMBLY

(a) Replace the telephone microphone assembly (See page ).


(b) Clear the DTCs (See page ).


(c) Recheck for DTCs and check if the same DTC is output again.

OK:

No DTCs are output.


OK

END


NG

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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