DESCRIPTION
The navigation receiver assembly and 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 telephone microphone assembly and the telephone microphone assembly sends microphone signals to the navigation receiver assembly.
WIRING DIAGRAM
PROCEDURE
1. |
CHECK MICROPHONE |
(a) Enter the "Microphone Check" screen. Refer to Check Microphone in
Operation Check (See page |
|
(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 (NAVIGATION RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) |
(a) Disconnect the N25 navigation 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 |
---|---|---|
N25-4 (MACC) - T26-1 (MACC) |
Always |
Below 1 Ω |
N25-5 (MIN+) - T26-2 (MIC+) |
Always |
Below 1 Ω |
N25-19 (MIN-) - T26-4 (MIC-) |
Always |
Below 1 Ω |
N25-6 (SNS2) - T26-3 (SNS2) |
Always |
Below 1 Ω |
N25-4 (MACC) - Body ground |
Always |
10 kΩ or higher |
N25-5 (MIN+) - Body ground |
Always |
10 kΩ or higher |
N25-19 (MIN-) - Body ground |
Always |
10 kΩ or higher |
N25-18 (SGND) - Body ground |
Always |
10 kΩ or higher |
N25-6 (SNS2) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the navigation receiver assembly connector.
(e) Reconnect the telephone microphone assembly connector.
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
INSPECT NAVIGATION RECEIVER ASSEMBLY |
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
N25-19 (MIN-) - Body ground |
Always |
Below 1 Ω |
N25-18 (SGND) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPLACE NAVIGATION RECEIVER ASSEMBLY |
|
4. |
INSPECT TELEPHONE MICROPHONE ASSEMBLY |
(a) Remove the telephone microphone assembly (See page
|
|
(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.
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 telephone microphone assembly is output |
A |
A waveform synchronized with the voice input to the telephone microphone assembly is not output |
B |
A | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
B | ![]() |
REPLACE TELEPHONE MICROPHONE ASSEMBLY |
Terminals Of Ecu
TERMINALS OF ECU
1. CLEARANCE WARNING ECU ASSEMBLY
(a) Disconnect the C30 connector from the clearance warning ECU assembly.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
Terminal No. (Symbol)
Wiring Color
Terminal Descr ...
Sound Quality is Bad Only when CD is Played (Volume is Too Low)
PROCEDURE
1.
REPLACE CD AND RECHECK
(a) Replace the CD with a known good one and check that the malfunction disappears.
OK:
Malfunction disappears.
OK
END
NG
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY
...
System Description
SYSTEM DESCRIPTION
1. GENERAL
(a) The air conditioning system has the following controls.
Control
Outline
Neural Network Control
This control is capable of effecting complex control by artificially
simulating the information processing method ...