Toyota 4Runner: Microphone Circuit between Microphone and Navigation Receiver Assembly

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

The navigation receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
Using this circuit, the navigation receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the navigation receiver assembly (w/o Manual (SOS) Switch).
Using this circuit, the DCM (telematics transceiver) sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the navigation receiver assembly via the DCM (telematics transceiver) (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.	CONFIRM MODEL

(a) Choose the model to be inspected.

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

GO TO STEP 4

2.	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
G37-4 (MACC) - U2-14 (MACC)	Always	Below 1 Ω
G37-5 (MIN+) - U2-13 (MCO+)	Always	Below 1 Ω
G37-19 (MIN-) - U2-12 (MCO-)	Always	Below 1 Ω
G37-6 (SNS2) - U2-15 (SNS2)	Always	Below 1 Ω
G37-4 (MACC) - Body ground	Always	10 kΩ or higher
G37-5 (MIN+) - Body ground	Always	10 kΩ or higher
G37-19 (MIN-) - Body ground	Always	10 kΩ or higher
G37-18 (SGND) - Body ground	Always	10 kΩ or higher
G37-6 (SNS2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT NAVIGATION RECEIVER ASSEMBLY

(a) Reconnect the G37 navigation receiver assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G37-4 (MACC) - Body ground	Ignition switch ACC	4 to 6 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G37-18 (SGND) - Body ground	Always	Below 1 Ω
G37-19 (MIN-) - Body ground	Always	Below 1 Ω

(e) 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 (Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

GO TO STEP 9

4.	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

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	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
G37-5 (MIN+) - F39-18 (MCO+)	Always	Below 1 Ω
G37-19 (MIN-) - F39-19 (MCO-)	Always	Below 1 Ω
G37-5 (MIN+) - Body ground	Always	10 kΩ or higher
G37-19 (MIN-) - Body ground	Always	10 kΩ or higher
G37-18 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	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
F39-33 (MCVD) - U2-14 (MACC)	Always	Below 1 Ω
F39-34 (MCI+) - U2-13 (MCO+)	Always	Below 1 Ω
F39-35 (MCI-) - U2-12 (MCO-)	Always	Below 1 Ω
F39-33 (MCVD) - Body ground	Always	10 kΩ or higher
F39-34 (MCI+) - Body ground	Always	10 kΩ or higher
F39-35 (MCI-) - Body ground	Always	10 kΩ or higher
F39-32 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	INSPECT NAVIGATION RECEIVER ASSEMBLY

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

(b) Reconnect the G37 navigation receiver assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G37-18 (SGND) - Body ground	Always	Below 1 Ω
G37-19 (MIN-) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Component with harness connected (Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

8.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
F39-33 (MCVD) - Body ground	Ignition switch ACC	4 to 6 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
F39-35 (MCI-) - Body ground	Always	Below 1 Ω
F39-32 (SGND) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Component with harness connected (DCM (Telematics Transceiver))

REPLACE DCM (TELEMATICS TRANSCEIVER)

9.	INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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

(b) 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 MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

10.	INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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

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

(d) Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the map light assembly (telephone microphone assembly) connector.

(e) Check the waveform of the telephone microphone assembly using the oscilloscope.

Result	Proceed to
A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output	A
A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output	B

Text in Illustration

*a	Component with harness connected (Map Light Assembly (Telephone Microphone Assembly))

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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