DESCRIPTION
The radio and display receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.
Using this circuit, the radio and display receiver assembly sends power to the telephone microphone assembly, and the telephone microphone assembly sends microphone signals to the radio and display receiver assembly.
WIRING DIAGRAM
PROCEDURE
1. |
CHECK MICROPHONE |
(a) Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check. Click here |
|
(b) When a voice is input into the microphone, check that the microphone input level meter changes according to the input voice.
OK:
Check result is normal.
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY |
(a) Disconnect the R31 radio and display receiver assembly connector.
(b) Disconnect the T26 telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
R31-4 (MACC) - T26-1 (MACC) |
Always |
Below 1 Ω |
R31-5 (MIN+) - T26-2 (MIC+) |
Always |
Below 1 Ω |
R31-19 (MIN-) - T26-4 (MIC-) |
Always |
Below 1 Ω |
R31-6 (SNS2) - T26-3 (SNS2) |
Always |
Below 1 Ω |
R31-4 (MACC) - Body ground |
Always |
10 kΩ or higher |
R31-5 (MIN+) - Body ground |
Always |
10 kΩ or higher |
R31-19 (MIN-) - Body ground |
Always |
10 kΩ or higher |
R31-18 (SGND) - Body ground |
Always |
10 kΩ or higher |
R31-6 (SNS2) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the radio and display receiver assembly connector.
(e) Reconnect the telephone microphone assembly connector.
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Remove the radio and display receiver assembly with connectors still connected.
(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:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
R31-19 (MIN-) - Body ground |
Always |
Below 1 Ω |
R31-18 (SGND) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
|
4. |
INSPECT TELEPHONE MICROPHONE ASSEMBLY |
(a) Remove the telephone microphone assembly. Click here |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3 (SNS2) - 4 (MIC-) |
Always |
Below 1 Ω |
(c) Install the telephone microphone assembly.
Click here
NG | ![]() |
REPLACE TELEPHONE MICROPHONE ASSEMBLY |
|
5. |
INSPECT TELEPHONE MICROPHONE ASSEMBLY |
(a) Turn the ignition switch to ACC. |
|
(b) Connect an oscilloscope to terminals 2 (MIC+) and 4 (MIC-) of the telephone microphone assembly connector.
(c) Check the waveform of the telephone microphone assembly using the oscilloscope.
Result
Result |
Proceed to |
---|---|
A waveform synchronized with the voice input to the amplifier microphone assembly is output |
A |
A waveform synchronized with the voice input to the amplifier microphone assembly is not output |
B |
A | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
B | ![]() |
REPLACE TELEPHONE MICROPHONE ASSEMBLY |
Entry Interior Alarm does not Sound
DESCRIPTION
The smart key system (for Entry Function) uses the buzzer in the combination
meter assembly to perform various vehicle interior warnings. When the conditions
of each warning are met, the certification ECU (smart key ECU assembly) sends a
buzzer activation request signal to the com ...
All Door Entry Lock/Unlock Functions do not Operate, but Wireless Functions
Operate
DESCRIPTION
When the wireless operation can be used to lock and unlock the doors, communication
between the electrical key and TPMS receiver assembly and certification ECU (smart
key ECU assembly) is normal. If the entry lock and unlock functions do not operate,
the entry cancel function may ...
Playing an audio CD and MP3/WMA/AAC discs
Insert disc or select “CD” on the “Select Audio Source” screen to begin listening
to a CD.
Audio control screen
1. “Select Audio Source” screen appears
2. Audio CD
Displaying the track list
MP3/WMA/AAC
Displaying the folder list
3. Random playback
4. Repeat play
5. Pause
...