Toyota 4Runner manuals

Toyota 4Runner: Voice Recognition Microphone Disconnected (B1579)

DESCRIPTION

The navigation 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)
  • DCM (telematics transceiver)*1
  • Navigation receiver assembly
  • Harness or connector
  • *1: w/ Manual (SOS) Switch

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

After replacing the navigation receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary.

PROCEDURE

1.

INSPECT NAVIGATION RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G37-19 (MIN-) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Component with harness connected

(Navigation Receiver Assembly)



NG

REPLACE NAVIGATION RECEIVER ASSEMBLY

OK

2.

CONFIRM MODEL

(a) Choose the model to be inspected.

Model

Proceed to

w/ Manual (SOS) Switch

A

w/o Manual (SOS) Switch

B


B

GO TO STEP 7

A

3.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

(a) Disconnect the F39 DCM (telematics transceiver) 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

F39-35 (MCI-) - U2-12 (MCO-)

Always

Below 1 Ω

F39-35 (MCI-) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the G37 navigation receiver assembly connector.

(b) Disconnect the F39 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G37-19 (MIN-) - F39-19 (MCO-)

Always

Below 1 Ω

G37-19 (MIN-) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

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

(a) Disconnect the G37 navigation 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

G37-6 (SNS2) - U2-15 (SNS2)

Always

Below 1 Ω

G37-6 (SNS2) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Reconnect the F39 DCM (telematics transceiver) connector.

(b) Reconnect the G37 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F39-35 (MCI-) - Body ground

Always

Below 1 Ω


(d) Proceed to the next step based on the inspection result.

Result

Proceed to

NG

A

OK

B

Text in Illustration

*a

Component with harness connected

(DCM (Telematics Transceiver))


A

REPLACE DCM (TELEMATICS TRANSCEIVER)


B

GO TO STEP 8

7.

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

(a) Disconnect the G37 navigation 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

G37-6 (SNS2) - U2-15 (SNS2)

Always

Below 1 Ω

G37-19 (MIN-) - U2-12 (MCO-)

Always

Below 1 Ω

G37-6 (SNS2) - Body ground

Always

10 kΩ or higher

G37-19 (MIN-) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

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 NAVIGATION RECEIVER ASSEMBLY


NG

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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