Microphone Circuit between Microphone and Radio Receiver
AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Microphone Circuit between Microphone and Radio Receiver
- Microphone Circuit between Microphone and Radio Receiver
DESCRIPTION
This circuit sends the microphone signal from the map light assembly (telephone microphone assembly) to the radio receiver assembly.
It also supplies power source from the radio receiver assembly to the map light assembly (telephone microphone assembly).
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT RADIO RECEIVER ASSEMBLY
(a) Disconnect the radio receiver assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE RADIO RECEIVER ASSEMBLY Removal
OK -- Continue to next step.
2. CONFIRM MODEL
(a) Choose the model to be inspected.
Result:
B -- CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RADIO RECEIVER ASSEMBLY)
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RADIO RECEIVER ASSEMBLY)
(a) Disconnect the radio receiver assembly connector.
(b) Disconnect the map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT MAP LIGHT ASSEMBLY
(a) 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.
5. INSPECT MAP LIGHT ASSEMBLY
(a) Reconnect the radio receiver assembly connector.
(b) Reconnect the map light assembly connector.
(c) Turn the power switch on (ACC).
(d) Connect an oscilloscope to terminals U3-4 (MCO+) and U3-3 (MCO-) of the 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
6. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RADIO RECEIVER ASSEMBLY)
(a) Disconnect the radio receiver assembly connector.
(b) Disconnect the map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. INSPECT MAP LIGHT ASSEMBLY
(a) 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 radio receiver assembly connector.
(b) Reconnect the map light assembly connector.
(c) Turn the power switch on (ACC).
(d) Connect an oscilloscope to terminals U13-5 (MCO+) and U13-4 (MCO-) of the 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.
HINT
* w/o Sliding Roof Removal
* w/ Sliding Roof Removal
(b) Check if the same malfunction recurs.
Result:
B -- REPLACE MAP LIGHT ASSEMBLY Removal
A -- END