Toyota CH-R Service Manual: Microphone Circuit between Microphone and Radio Receiver

Toyota CH-R Service Manual / Audio / Video / Audio And Visual System(for Radio Receiver Type) / Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

The radio 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 radio 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 radio receiver assembly.

WIRING DIAGRAM

PROCEDURE

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

(a) Disconnect the F47 radio receiver assembly connector.

(b) Disconnect the R2 map light assembly (telephone microphone assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F47-6 (SNS2) - R2-1 (SNS2)	Always	Below 1 Ω
F47-4 (MACC) - R2-9 (MACC)	Always	Below 1 Ω
F47-5 (MIN+) - R2-8 (MCO+)	Always	Below 1 Ω
F47-19 (MIN-) - R2-7 (MCO-)	Always	Below 1 Ω
F47-6 (SNS2) or R2-1 (SNS2) - Body ground	Always	10 kΩ or higher
F47-4 (MACC) or R2-9 (MACC) - Body ground	Always	10 kΩ or higher
F47-5 (MIN+) or R2-8 (MCO+) - Body ground	Always	10 kΩ or higher
F47-19 (MIN-) or R2-7 (MCO-) - Body ground	Always	10 kΩ or higher
F47-18 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT RADIO RECEIVER ASSEMBLY

(a) Connect the F47 radio receiver assembly connector.

(b) Connect the R2 map light assembly (telephone microphone assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
F47-4 (MACC) - Body ground	Ignition switch ACC	4 to 6 V

*a	Component with harness connected (Radio Receiver Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F47-18 (SGND) - Body ground	Always	Below 1 Ω
F47-19 (MIN-) - Body ground	Always	Below 1 Ω

REPLACE RADIO RECEIVER ASSEMBLY

3.	INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

(a) Remove the map light assembly (telephone microphone assembly).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (SNS2) - 7 (MCO-)	Always	Below 1 Ω

*a	Component without harness connected (Map Light Assembly (Telephone Microphone Assembly))

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

4.	INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

(a) Connect the R2 map light assembly (telephone microphone assembly) connector.

(b) Turn the ignition switch to ACC.

(c) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the R2 map light assembly (telephone microphone assembly) connector.

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

(d) Check the waveform of the map light assembly (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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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