Microphone Circuit Between Microphone and Radio Receiver

AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (w/o Multi-display): Microphone Circuit between Microphone and Radio Receiver; 2013 MY Corolla [07/2012 -]
- Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

This circuit sends the microphone voice signal from the telephone microphone assembly to the radio receiver assembly.

Using this circuit, the radio receiver assembly sends power to the telephone microphone assembly, and the telephone microphone assembly sends microphone voice signals to the radio receiver assembly (w/o sliding roof system).

Using this circuit, the radio receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly sends microphone voice signals to the radio receiver assembly (w/ sliding roof system).

WIRING DIAGRAM

1. w/o Sliding Roof System

2. w/ Sliding Roof System

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT RADIO RECEIVER ASSEMBLY

(a) Disconnect the E114 radio receiver assembly connector.

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

Standard Voltage:

Text in Illustration

NG -- REPLACE RADIO RECEIVER ASSEMBLY Removal
OK -- Continue to next step.

2. CONFIRM MODEL

Result:

B -- CHECK HARNESS AND CONNECTOR (TELEPHONE MICROPHONE ASSEMBLY - RADIO RECEIVER ASSEMBLY)
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (TELEPHONE MICROPHONE ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the E114 radio receiver assembly connector.

(b) Disconnect the O9 telephone microphone assembly connector.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. INSPECT TELEPHONE MICROPHONE ASSEMBLY

(a) Disconnect the O9 telephone microphone assembly connector.

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

Standard Resistance:

Text in Illustration

NG -- REPLACE TELEPHONE MICROPHONE ASSEMBLY Removal
OK -- Continue to next step.

5. INSPECT TELEPHONE MICROPHONE ASSEMBLY

(a) Reconnect the O9 telephone microphone assembly connector.

(b) Reconnect the E114 radio receiver assembly connector.

(c) Turn the ignition switch to ACC.

(d) Connect an oscilloscope to terminals 2 (MIC+) and 4 (MIC-) of the O9 telephone microphone assembly connector.

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

Result:

Text in Illustration

B -- REPLACE TELEPHONE MICROPHONE ASSEMBLY Removal

A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

6. CHECK HARNESS AND CONNECTOR (TELEPHONE MICROPHONE ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the E114 radio receiver assembly connector.

(b) Disconnect the O10 map light assembly connector.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT MAP LIGHT ASSEMBLY

(a) Disconnect the O10 map light assembly connector.

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

Standard Resistance:

Text in Illustration

NG -- REPLACE TELEPHONE MICROPHONE ASSEMBLY
OK -- Continue to next step.

8. INSPECT MAP LIGHT ASSEMBLY

(a) Reconnect the O10 map light assembly connector.

(b) Reconnect the E114 radio receiver assembly connector.

(c) Turn the ignition switch to ACC.

(d) Connect an oscilloscope to terminals 11 (MI1+) and 10 (MIC-) of the O10 map light assembly connector.

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

Result:

Text in Illustration

B -- REPLACE TELEPHONE MICROPHONE ASSEMBLY

A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

9. REPLACE TELEPHONE MICROPHONE ASSEMBLY

(a) Replace the telephone microphone assembly Removal.

(b) Check if the same malfunction recurs.

Result:

B -- REPLACE MAP LIGHT ASSEMBLY Removal

A -- END