Toyota 4Runner: Voice Recognition Microphone Disconnected (B1579)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / 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)

REPLACE NAVIGATION RECEIVER ASSEMBLY

2.	CONFIRM MODEL

(a) Choose the model to be inspected.

Model	Proceed to
w/ Manual (SOS) Switch	A
w/o Manual (SOS) Switch	B

GO TO STEP 7

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

(b) Reconnect the G37 navigation receiver assembly connector.

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))

REPLACE DCM (TELEMATICS TRANSCEIVER)

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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))

REPLACE NAVIGATION RECEIVER ASSEMBLY

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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