Microphone Circuit Between Microphone and Navigation ECU
NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: 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. CHECK 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 H4 display and navigation module display connector.
(b) Disconnect the W7 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
B -- CHECK DISPLAY AND NAVIGATION MODULE DISPLAY
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - TELEMATICS TRANSCEIVER)
(a) Disconnect the H4 display and navigation module display connector.
(b) Disconnect the G56 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 G56 telematics transceiver connector.
(b) Disconnect the W7 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. INSPECT MAP LIGHT ASSEMBLY
(a) Remove the map light assembly Removal.
(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) Connect an oscilloscope to terminals W7-12 (MCO+) and W7-13 (MCO-) of the telephone microphone assembly connector.
(b) Turn the engine switch on (ACC).
(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 (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)
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. INSPECT MAP LIGHT ASSEMBLY
(a) Remove the map light assembly Removal.
(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.
11. CHECK MAP LIGHT ASSEMBLY
(a) Connect an oscilloscope to terminals W7-12 (MCO+) and W7-13 (MCO-) of the telephone microphone assembly connector.
(b) Turn the engine switch on (ACC).
(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
12. REPLACE TELEPHONE MICROPHONE ASSEMBLY
(a) Replace the map light assembly Removal.
(b) Check if the same malfunction recurs.
Result
B -- REPLACE MAP LIGHT ASSEMBLY Removal
A -- END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)