DESCRIPTION
The multi-media module receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
This DTC is stored when a microphone connection detection signal line is disconnected.
DTC Code | DTC Detection Condition | Trouble Area |
---|---|---|
B1579 | Telephone microphone signal is lost. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
When replacing the multi-media module receiver assembly or the telematics transceiver, perform the vehicle contract setting Click here.
PROCEDURE
CONFIRM MODEL
Choose the model to be inspected.
Model | Proceed to |
---|---|
w/o Emergency Call Switch | A |
w/ Emergency Call Switch | B |
B |
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) Click here |
A |
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
Disconnect the L146 multi-media module receiver assembly connector.
Disconnect the X4 map light assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY
*a | Component with harness connected (Multi-media Module Receiver 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 MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here |
OK |
INSPECT MAP LIGHT ASSEMBLY
Remove the map light assembly Click here.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
CHECK TELEPHONE MICROPHONE ASSEMBLY Click here |
OK |
CHECK MAP LIGHT ASSEMBLY
*a | Component with harness connected (Map Light Assembly) |
Turn the engine switch on (ACC).
Connect an oscilloscope to terminals X4-20 (MIC-) and X4-21 (MI1+) of the map light assembly connector.
Check the waveform of the telephone microphone assembly using the oscilloscope.
Result | Proceed to |
---|---|
A waveform synchronized with the voice input to the map light assembly is output. | A |
A waveform synchronized with the voice input to the map light assembly is not output. | B |
B |
CHECK TELEPHONE MICROPHONE ASSEMBLY Click here |
A |
REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here
CHECK TELEPHONE MICROPHONE ASSEMBLY
Replace the telephone microphone assembly with a new or normally functioning one Click here.
Check if the same DTC is output again.
Result | Proceed to |
---|---|
No DTCs are output. | A |
DTCs are output. | B |
B |
REPLACE MAP LIGHT ASSEMBLY Click here |
A |
END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
Disconnect the L146 multi-media module receiver assembly connector.
Disconnect the X4 map light assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER])
Disconnect the L146 multi-media module receiver assembly connector.
Disconnect the L142 DCM (telematics transceiver) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - MAP LIGHT ASSEMBLY)
Disconnect the L142 DCM (telematics transceiver) connector.
Disconnect the X4 map light assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY
*a | Component with harness connected (Multi-media Module Receiver Assembly) |
Disconnect the L142 DCM (telematics transceiver) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here |
OK |
CHECK DCM (TELEMATICS TRANSCEIVER)
*a | Component with harness connected (DCM [Telematics Transceiver]) |
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 DCM (TELEMATICS TRANSCEIVER) Click here |
OK |
INSPECT MAP LIGHT ASSEMBLY
Remove the map light assembly Click here.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
CHECK TELEPHONE MICROPHONE ASSEMBLY Click here |
OK |
CHECK MAP LIGHT ASSEMBLY
*a | Component with harness connected (Map Light Assembly) |
Turn the engine switch on (ACC).
Connect an oscilloscope to terminals X4-21 (MI1+) and X4-20 (MIC-) of the map light assembly connector.
Check the waveform of the telephone microphone assembly using the oscilloscope.
Result | Proceed to |
---|---|
A waveform synchronized with the voice input to the map light assembly is output. | A |
A waveform synchronized with the voice input to the map light assembly is not output. | B |
B |
CHECK TELEPHONE MICROPHONE ASSEMBLY Click here |
A |
REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here
CHECK TELEPHONE MICROPHONE ASSEMBLY
Replace the telephone microphone assembly with a new or normally functioning one Click here.
Check if the same DTC is output again.
Result | Proceed to |
---|---|
No DTCs are output. | A |
DTCs are output. | B |
B |
REPLACE MAP LIGHT ASSEMBLY Click here |
A |
END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)