Microphone Circuit between Microphone and Radio Receiver

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM (w/o Navigation System without Multi-display): Microphone Circuit between Microphone and Radio Receiver
- Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

* w/o Manual (SOS) Switch

Using this circuit, the radio receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly sends microphone signals to the radio receiver assembly.

* w/ Manual (SOS) Switch

Using this circuit, the DCM (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 radio receiver assembly via the DCM (telematics transceiver). The radio receiver assembly 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. CONFIRM MODEL

(a) Choose the model to be inspected.

Result:

B -- CHECK HARNESS AND CONNECTOR
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR

(a) Disconnect the radio receiver assembly and map light assembly connectors.

(b) 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.

3. INSPECT RADIO RECEIVER ASSEMBLY

(a) Disconnect the radio receiver assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

(d) Proceed to the next step based on the inspection result.

Result:

Text in Illustration

B -- INSPECT MAP LIGHT ASSEMBLY

A -- REPLACE RADIO RECEIVER ASSEMBLY Removal

4. CHECK HARNESS AND CONNECTOR

(a) Disconnect the radio receiver assembly and map light assembly connectors.

(b) 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

(a) Disconnect the radio receiver assembly and DCM (telematics transceiver) connectors.

(b) 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 HARNESS AND CONNECTOR

(a) Disconnect the DCM (telematics transceiver) and map light assembly connectors.

(b) 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.

7. INSPECT RADIO RECEIVER ASSEMBLY

(a) Disconnect the radio receiver assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE RADIO RECEIVER ASSEMBLY Removal
OK -- Continue to next step.

8. INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Reconnect the radio receiver assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

NG -- REPLACE DCM (TELEMATICS TRANSCEIVER)
OK -- Continue to next step.

9. INSPECT MAP LIGHT ASSEMBLY

(a) 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.

10. INSPECT MAP LIGHT ASSEMBLY

(a) Reconnect the radio receiver assembly connector.

(b) Reconnect the DCM (telematics transceiver) connector (w/ Manual (SOS) Switch).

(c) Reconnect the map light assembly connector.

(d) Turn the engine switch on (ACC).

(e) Connect an oscilloscope to terminals 16 (MCO+) and 17 (MCO-) of the R5 map light assembly connector.

(f) 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

11. 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