Microphone Circuit Between Microphone and Navigation ECU
NAVIGATION: NAVIGATION SYSTEM (for HDD): Microphone Circuit between Microphone and Navigation ECU
- Microphone Circuit between Microphone and Navigation ECU
DESCRIPTION
w/ Manual (SOS) Switch
Using this circuit, the telematics transceiver sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the display and navigation module display via the telematics transceiver. The display and navigation module display and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
w/o Manual (SOS) Switch
Using this circuit, the display and navigation module display sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the display and navigation module display. The display and navigation module display and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - MAP LIGHT ASSEMBLY)
(a) Disconnect the L132 display and navigation module display connector.
(b) Disconnect the X4 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/ Manual (SOS) Switch
w/o Manual (SOS) Switch
Result
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- CHECK DISPLAY AND NAVIGATION MODULE DISPLAY
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - TELEMATICS TRANSCEIVER)
(a) Disconnect the L132 display and navigation module display connector.
(b) Disconnect the L127 telematics transceiver connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - MAP LIGHT ASSEMBLY)
(a) Disconnect the L127 telematics transceiver connector.
(b) Disconnect the X4 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK TELEMATICS TRANSCEIVER
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE TELEMATICS TRANSCEIVER Removal
OK -- Continue to next step.
6. CHECK MAP LIGHT ASSEMBLY
(a) Disconnect the X4 map light assembly connector.
(b) 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.
7. CHECK MAP LIGHT ASSEMBLY
(a) Turn the power switch on (ACC).
(b) Connect an oscilloscope to terminals X4-21 (MI1+) and X4-20 (MIC-) of the telephone microphone assembly connector.
(c) 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
8. REPLACE TELEPHONE MICROPHONE ASSEMBLY
(a) Replace the telephone microphone assembly Removal.
(b) Check if the same malfunction recurs.
Result
B -- REPLACE MAP LIGHT ASSEMBLY Removal
A -- END
9. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
OK -- Continue to next step.
10. CHECK MAP LIGHT ASSEMBLY
(a) Disconnect the X4 map light assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK TELEPHONE MICROPHONE ASSEMBLY
OK -- Continue to next step.
11. CHECK MAP LIGHT ASSEMBLY
(a) Turn the power switch on (ACC).
(b) Connect an oscilloscope to terminals X4-21 (MI1+) and X4-20 (MIC-) of the telephone microphone assembly connector.
(c) Check the waveform of the telephone microphone assembly using the oscilloscope.
Result
Text in Illustration
B -- CHECK TELEPHONE MICROPHONE ASSEMBLY
A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table
12. CHECK TELEPHONE MICROPHONE ASSEMBLY
(a) Replace the telephone microphone assembly Removal.
(b) Check if the same malfunction recurs.
Result
B -- REPLACE MAP LIGHT ASSEMBLY Removal
A -- END