Toyota Avalon (XX50): Illumination Circuit. Illumination for Panel Switch does not Come on with Tail Switch ON. Microphone Circuit

Illumination Circuit

DESCRIPTION

Power is supplied to the radio and display receiver assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

  Click here

• Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

(a) Check if the illumination for the radio and display receiver assembly, steering pad switch assembly, heater control switch or others (hazard switch, transmission control switch, etc.) comes on when the light control switch is turned to the head or tail position.

B

GO TO STEP 5

C

GO TO LIGHTING SYSTEM

A

(a) Disconnect the G17 spiral cable sub-assembly connector.

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

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Remove the steering pad switch assembly.

Click here

(b) Inspect the steering pad switch assembly.

Click here

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

(a) Remove the spiral cable sub-assembly.

Click here

(b) Inspect the spiral cable sub-assembly.

Click here

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY, COMBINATION METER ASSEMBLY)

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

(a) Disconnect the G2 radio and display receiver assembly connector.

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

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the G16 combination meter assembly connector.

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

Standard Resistance:

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Illumination for Panel Switch does not Come on with Tail Switch ON

CAUTION / NOTICE / HINT

NOTICE:

• Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

  Click here

• When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
  • A communication malfunction DTC may be stored.
  • The radio and display receiver assembly may not operate normally.

PROCEDURE

(a) Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check. Click here

(b) Check that the display changes between ON and OFF according to the light control switch operation.

OK:

HINT:

• This display is updated once per second. As a result, it is normal for the display to lag behind the actual switch operation.
• Make sure to move the vehicle to a bright area before performing an operation check with the light control switch in the AUTO position.

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Microphone Circuit

DESCRIPTION

• w/o Manual (SOS) Switch:

  The radio and display receiver assembly, roof console box sub-assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.

  Using this circuit, the radio and display receiver assembly sends power to the roof console box sub-assembly and telephone microphone assembly, and the roof console box sub-assembly and telephone microphone assembly sends microphone signals to the radio and display receiver assembly.

• w/ Manual (SOS) Switch:

  The radio and display receiver assembly, roof console box sub-assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.

  Using this circuit, the DCM (telematics transceiver) sends power to the roof console box sub-assembly and telephone microphone assembly, and the roof console box sub-assembly and telephone microphone assembly sends microphone signals to the radio and display receiver assembly via the DCM (telematics transceiver).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

  Click here

• When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
  • A communication malfunction DTC may be stored.
  • The radio and display receiver assembly may not operate normally.
• Before replacing the DCM (telematics transceiver), refer to Registration.

  Click here

PROCEDURE

(a) Enter the "Microphone Check" screen. Refer to Check Microphone (Input to navigation ECU) in Operation Check. Click here

(b) When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

OK:

Check result is normal.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

(a) Enter the "Microphone Check" screen. Refer to Check Microphone (Input to radio and display receiver assembly) in Operation Check. Click here

(b) When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

OK:

Check result is normal.

B

GO TO STEP 9

C

GO TO STEP 19

A

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the O10 roof console box sub-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

(a) Connect the G2 radio and display receiver assembly connector.

(b) Connect the O10 roof console box sub-assembly connector.

(c) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition G2-23 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V

*a Component with harness connected (Radio and Display Receiver Assembly)

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

Standard Resistance:

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

(a) Remove the roof console box sub-assembly.

Click here

(b) Connect the B telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 6 (SNS2) - 7 (MCO-) Always Below 1 Ω

*a Component without harness connected (Roof Console Box Sub-assembly)

NG

GO TO STEP 8

OK

(a) Connect the G2 radio and display receiver assembly connector.

(b) Connect the O10 roof console box sub-assembly connector.

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

(d) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the O10 roof console box sub-assembly connector.

*a Component with harness connected (Roof Console Box Sub-assembly)

(e) Check the signal waveform according to the condition(s) in the table below.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

(a) Remove the roof console box sub-assembly.

Click here

(b) Disconnect the B telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O10-8 (MCO+) - B-3 Always Below 1 Ω O10-7 (MCO-) - B-2 Always Below 1 Ω O10-8 (MCO+) or B-3 - O10-15 (GND) Always 10 kΩ or higher O10-7 (MCO-) or B-2 - O10-15 (GND) Always 10 kΩ or higher

*a Component without harness connected (Roof Console Box Sub-assembly (No. 1 Roof Wire Side)) *b Component without harness connected (Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))

OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here

(b) Disconnect the B telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O10-6 (SNS2) - B-1 Always Below 1 Ω O10-7 (MCO-) - B-2 Always Below 1 Ω O10-6 (SNS2) or B-1 - O10-15 (GND) Always 10 kΩ or higher O10-7 (MCO-) or B-2 - O10-15 (GND) Always 10 kΩ or higher

*a Component without harness connected (Roof Console Box Sub-assembly (No. 1 Roof Wire Side)) *b Component without harness connected (Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))

OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the O10 roof console box sub-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

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the G9 DCM (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

(a) Disconnect the G9 DCM (telematics transceiver) connector.

(b) Disconnect the O10 roof console box sub-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

(a) Disconnect the G9 DCM (telematics transceiver) connector.

(b) Connect the G2 radio and display receiver assembly connector.

*a Component with harness connected (Radio and Display Receiver Assembly)

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

Standard Resistance:

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

(a) Connect the G9 DCM (telematics transceiver) connector.

(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition G9-33 (MCVD) - Body ground Engine switch on (ACC) 4 to 6 V

*a Component with harness connected (DCM (Telematics Transceiver))

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

Standard Resistance:

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

(a) Remove the roof console box sub-assembly.

Click here

(b) Connect the B telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 6 (SNS2) - 7 (MCO-) Always Below 1 Ω

*a Component without harness connected (Roof Console Box Sub-assembly)

NG

GO TO STEP 18

OK

(a) Connect the G2 radio and display receiver assembly connector.

(b) Connect the O10 roof console box sub-assembly connector.

(c) Connect the G9 DCM (telematics transceiver) connector.

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

(e) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the O10 roof console box sub-assembly connector.

*a Component with harness connected (Roof Console Box Sub-assembly)

(f) Check the signal waveform according to the condition(s) in the table below.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

NG

GO TO STEP 17

OK

(a) Connect the G2 radio and display receiver assembly connector.

(b) Connect the O10 roof console box sub-assembly connector.

(c) Connect the G9 DCM (telematics transceiver) connector.

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

(e) Connect an oscilloscope to terminals 18 (MCO+) and 19 (MCO-) of the G9 DCM (telematics transceiver) connector.

*a Component with harness connected DCM (Telematics Transceiver)

(f) Check the signal waveform according to the condition(s) in the table below.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Remove the roof console box sub-assembly.

Click here

(b) Disconnect the B telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O10-8 (MCO+) - B-3 Always Below 1 Ω O10-7 (MCO-) - B-2 Always Below 1 Ω O10-8 (MCO+) or B-3 - O10-15 (GND) Always 10 kΩ or higher O10-7 (MCO-) or B-2 - O10-15 (GND) Always 10 kΩ or higher

*a Component without harness connected (Roof Console Box Sub-assembly (No. 1 Roof Wire Side)) *b Component without harness connected (Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))

OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here

(b) Disconnect the B telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O10-6 (SNS2) - B-1 Always Below 1 Ω O10-7 (MCO-) - B-2 Always Below 1 Ω O10-6 (SNS2) or B-1 - O10-15 (GND) Always 10 kΩ or higher O10-7 (MCO-) or B-2 - O10-15 (GND) Always 10 kΩ or higher

*a Component without harness connected (Roof Console Box Sub-assembly (No. 1 Roof Wire Side)) *b Component without harness connected (Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))

OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Disconnect the G1 radio and display receiver assembly connector.

(b) Disconnect the G13 navigation ECU connector.

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

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Disconnect the G13 navigation ECU connector.

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

(c) Check the signal waveform according to the condition(s) in the table below. Item Condition Measurement terminal G13-13 (MIC+) - G13-14 (MIC-) Tool setting 50 mV/DIV., 500 ms/DIV. Vehicle condition Turn the engine switch on (ACC). Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes. OK: The waveform is similar to that shown in the illustration. HINT: The oscilloscope waveform shown in the illustration is an example for reference only.

*a Front view of wire harness connector (to Navigation ECU)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY