DESCRIPTION
The navigation ECU sub-assembly and roof console box assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
Using this circuit, the navigation ECU sub-assembly sends power to the roof console box assembly (telephone microphone assembly), and the roof console box assembly (telephone microphone assembly) sends microphone signals to the navigation ECU sub-assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))
Disconnect the navigation ECU sub-assembly connector.
Disconnect the roof console box assembly (telephone microphone assembly) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||||||||
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|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT NAVIGATION ECU SUB-ASSEMBLY
Reconnect the navigation ECU sub-assembly connector.
Reconnect the roof console box assembly (telephone microphone assembly) connector.
*a | Component with harness connected (Navigation ECU Sub-assembly) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here |
OK |
INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)
Disconnect the roof console box assembly (telephone microphone assembly) connector.
*a | Component without harness connected (Roof Console Box Assembly (Telephone Microphone Assembly)) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here |
OK |
INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)
Reconnect the navigation ECU sub-assembly connector.
*a | Component with harness connected (Roof Console Box Assembly (Telephone Microphone Assembly)) |
Reconnect the roof console box assembly (telephone microphone assembly) connector.
Turn the power switch on (ACC).
Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the roof console box assembly (telephone microphone assembly) connector.
Check the waveform of the telephone microphone assembly using the oscilloscope.
Result | ||||||
---|---|---|---|---|---|---|
|
B |
REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here |
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here