Microphone Circuit Between Microphone and Navigation Receiver Assembly
NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Microphone Circuit between Microphone and Navigation Receiver Assembly
- Microphone Circuit between Microphone and Navigation Receiver Assembly
DESCRIPTION
This circuit sends a microphone signal from the telephone microphone assembly to the navigation receiver assembly.
It also supplies power from the navigation receiver assembly to the telephone microphone assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK VEHICLE EQUIPMENT
(a) Check if the telephone switch is equipped on the vehicle.
Result
B -- CHECK NAVIGATION RECEIVER ASSEMBLY
A -- Continue to next step.
2. CHECK NAVIGATION RECEIVER ASSEMBLY
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - MAP LIGHT)
(a) Disconnect the G20 navigation receiver assembly connector.
(b) Disconnect the U2 map light assembly connector.
(c) Measure the resistance according to the value(s) in the below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - TELEMATICS TRANSCEIVER)
(a) Disconnect the G20 navigation receiver assembly connector.
(b) Disconnect the F39 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.
5. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - MAP LIGHT)
(a) Disconnect the F39 telematics transceiver connector.
(b) Disconnect the U2 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.
6. 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.
7. 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:
NG -- REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK
OK -- Continue to next step.
8. CHECK MAP LIGHT ASSEMBLY
(a) Turn the ignition switch to ACC.
(b) Connect an oscilloscope to terminals MCO+ and MCO- of the U2 map light assembly connector.
(c) Check the waveform of the telephone microphone assembly using an oscilloscope.
Result
Text in Illustration
B -- REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK
A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
9. REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK
(a) Replace the telephone microphone assembly with a new or normally functioning one Removal.
(b) Check if the same problem occurs again.
OK:
Malfunction disappears.
NG -- REPLACE MAP LIGHT ASSEMBLY Removal
OK -- END (TELEPHONE MICROPHONE IS FAULTY)
10. CHECK 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:
Text in Illustration
NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - MAP LIGHT)
(a) Disconnect the G20 navigation receiver assembly connector.
(b) Disconnect the U2 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.
12. 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:
NG -- REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK
OK -- Continue to next step.
13. CHECK MAP LIGHT ASSEMBLY
(a) Turn the ignition switch to ACC.
(b) Connect an oscilloscope to terminals MCO+ and MCO- of the U2 map light assembly connector.
(c) Check the waveform of the telephone microphone assembly using an oscilloscope.
Result
Text in Illustration
NG -- REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
14. REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK
(a) Replace the telephone microphone assembly with a new or normally functioning one Removal.
(b) Check if the same problem occurs again.
OK:
Malfunction disappears.
NG -- REPLACE MAP LIGHT ASSEMBLY Removal
OK -- END (TELEPHONE MICROPHONE IS FAULTY)