Audio / Visual System (Diagnostic Codes & Circuit Tests): Overview Toyota Sienna III

DESCRIPTION

HINT

1. *1: Even if no fault is present, this trouble code may be stored depending on the battery condition or engine start voltage.
2. *2: If the power connector is disconnected after the engine starts, this code is stored after 180 seconds.
3. *3: If the device is reported as not existing during verification, check the power source circuit and AVC-LAN circuit for the device.
4. *4: This code may be stored if the engine is started and the ignition switch is turned to the start position again.

Note. Before starting troubleshooting, be sure to clear DTCs to clear codes stored due to the reasons described in Hint above. Then, check for DTCs and troubleshoot according to the output DTCs. The radio receiver assembly is the master unit. Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.

HINT

1. *1: Even if no fault is present, this trouble code may be stored depending on the battery condition or engine start voltage.
2. *2: When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the ignition switch in ACC or ON, this code is stored.

Note. Before starting troubleshooting, be sure to clear DTCs to clear codes stored due to the reasons described in Hint above. Then, check for DTCs and troubleshoot according to the output DTCs. The radio receiver assembly is the master unit. Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.

Scheme 130

HINT

This code may be stored if the engine is started, idled for 60 seconds and then the ignition switch is turned to the start position again.

Note. Before starting troubleshooting, be sure to clear DTCs to clear codes stored due to the reasons described in Hint above. Then, check for DTCs and troubleshoot according to the output DTCs. The radio receiver assembly is the master unit. Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.

HINT

1. *1: This code may be stored if the engine is started and the ignition switch is turned to start position again.
2. *2: Even if no fault is present, this trouble code may be stored depending on the battery condition or engine start voltage.

Note. Before starting troubleshooting, be sure to clear DTCs to clear codes stored due to the reasons described in Hint above. Then, check for DTCs and troubleshoot according to the output DTCs. The radio receiver assembly is the master unit. Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.

HINT

*: When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the ignition switch ACC or ON, this code is stored.

Note. Before starting troubleshooting, be sure to clear DTCs to clear codes stored due to the reasons described in Hint above. Then, check for DTCs and troubleshoot according to the output DTCs. The radio receiver assembly is the master unit. Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.

HINT

Even if no fault is present, this trouble code may be stored depending on the battery condition or engine start voltage.

1. *: w/ Safety Connect System

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

1. REPLACE USB Device OR "iPod" Disconnect the USB device or "iPod" from the No. 1 stereo jack adapter assembly. Turn the ignition switch off. HINT: When this DTC has been stored, it is necessary to turn off the ignition switch to make it possible for the vehicle to recognize a new device when it is connected. Turn the ignition switch to ACC. Connect a known good USB device or "iPod" to the No. 1 stereo jack adapter assembly. NEXT: Go to next step
2. CLEAR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-494220-S23671323112012081000000). NEXT: Go to next step
3. RECHECK FOR DTC Recheck for DTCs and check if the same DTC occurs again. HINT: If DTCs are detected frequently, replace the multi-media interface ECU. OK Malfunction disappears. NG --> See step 4 OK --> USB DEVICE OR "iPod" WAS DEFECTIVE
4. CHECK NO. 1 STEREO JACK ADAPTER ASSEMBLY Disconnect the D128 No. 1 stereo jack adapter assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D128-1 - D128-4 Always 5 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to No. 1 Stereo Jack Adapter Assembly) NG --> See step 5 OK --> See step 6
5. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - STEREO JACK ADAPTER) Disconnect the D129 multi-media interface ECU connector. Disconnect the D128 No. 1 stereo jack adapter assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D129-4 - D128-4 Always Below 1 ohms D129-1 - D128-1 Always Below 1 ohms D129-4 - Body ground Always 10 kohms or higher D129-1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
6. REPLACE NO. 1 STEREO JACK ADAPTER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S05379137372012081000000)
7. REPLACE MULTI-MEDIA INTERFACE ECU. Refer to «REMOVAL»(ref-494209-S33733798982012081000000)

Audio function

This circuit is necessary for the automatic sound levelizer (ASL) built into the radio receiver assembly.

ASL function

Speed signals are received from the combination meter assembly and used for the ASL.

The ASL function automatically adjusts the sound volume in order to maintain clear audio sound even when vehicle noise increases (as vehicle noise increases, the volume is turned up, etc.).

HINT

1. A voltage of 12 V or 5 V is output from each ECU connected to the combination meter assembly, and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective systems based on the pulse signal.
2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, related components will not operate normally.

Scheme 136

Scheme 137

1. CHECK OPERATION OF SPEEDOMETER Drive the vehicle and check if the function of the speedometer on the combination meter assembly is normal. OK Actual vehicle speed and the speed indicated on the speedometer are the same. HINT: The vehicle speed sensor is functioning normally when the indication on the speedometer is normal. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, refer to "ON-VEHICLE INSPECTION" in the meter/gauge system. Refer to «ON-VEHICLE INSPECTION»(ref-494136-S34984712232012081000000). NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER) Disconnect the D63 radio receiver assembly connector. Disconnect the D18 combination meter assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D63-3 (SPD) - D18-10 (+S) Always Below 1 ohms D63-3 (SPD) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT COMBINATION METER ASSEMBLY (SPEED SIGNAL) Check the input waveform. Remove the combination meter assembly with the connector(s) still connected. Connect an oscilloscope to terminal D18-10 (+S) and body ground. Turn the ignition switch to ON. Check the signal waveform according to the condition(s) in the table below. MEASUREMENT CONDITION Item Condition Terminal No. (Symbol) D18-10 (+S) - Body ground Tool setting 5 V/DIV., 20 ms./DIV. Condition Being driven at approx, 20 km/h (12 mph) OK The waveform displayed is as shown in the illustration. TEXT IN ILLUSTRATION *1 Component with harness connected (Combination Meter Assembly) HINT: When the system is function normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. NG --> See step 6 OK --> See step 5
4. GO TO METER / GAUGE SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-494140-S28547449322012081000000)
5. REPLACE RADIO RECEIVER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S28627906952012081000000)
6. REPLACE COMBINATION METER ASSEMBLY. Refer to «REMOVAL»(ref-494154-S27661358102012081000000)

This circuit sends an operation signal from the steering pad switch assembly to the radio receiver assembly.

If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.

If there is a short in the circuit, the same condition as when the switch is continuously depressed occurs.

Therefore, the radio receiver assembly cannot be operated using the steering pad switch assembly, and the radio receiver assembly itself cannot function.

Scheme 138

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

Scheme 139

The stereo component amplifier assembly sends sound signals to the speaker.

The radio receiver assembly sends sound signals to the speaker.

Scheme 140

Scheme 141

Scheme 142

1. CHECK SPEAKER Check the malfunctioning speakers. RESULT Result Proceed to Malfunction in front speaker area A Malfunction in rear speaker area B B --> See step 7 A: Go to next step
2. CHECK FRONT SIDE SPEAKER Check the malfunctioning speakers. RESULT Result Proceed to Front No. 2 speaker assembly*1 A Front No. 1 speaker assembly*1 B Front No. 1 speaker assembly*2 C *1: for 6 Speaker *2: for 4 Speaker B --> See step 5 C --> See step 7 A: Go to next step
3. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY Disconnect the D81*1 and/or D10*2 front No. 2 speaker assembly connector. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance for RH for LH Tester Connection Condition Specified Condition 1 (+) - 2 (TWR+) Always Below 1 ohms 3 (-) - 4 (TWR-) Always Below 1 ohms 2 (TWR+) - 4 (TWR-) Always Approximately 4 ohms Tester Connection Condition Specified Condition 1 (+) - 2 (TWL+) Always Below 1 ohms 3 (-) - 4 (TWL-) Always Below 1 ohms 2 (TWL+) - 4 (TWL-) Always Approximately 4 ohms TEXT IN ILLUSTRATION *A for RH *B for LH *1 Component without harness connected (Front No. 2 Speaker Assembly) NG --> See step 11 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - FRONT NO. 2 SPEAKER) Disconnect the D134 radio receiver assembly connector. Disconnect the D81*1 and/or D10*2 front No. 2 speaker assembly connector. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance for RH for LH Tester Connection Condition Specified Condition D134-1 (FR+) - D81-2 (TWR+) Always Below 1 ohms D134-5 (FR-) - D81-4 (TWR-) Always Below 1 ohms D134-1 (FR+) - Body ground Always 10 kohms or higher D134-5 (FR-) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition D134-2 (FL+) - D10-2 (TWL+) Always Below 1 ohms D134-6 (FL-) - D10-4 (TWL-) Always Below 1 ohms D134-2 (FL+) - Body ground Always 10 kohms or higher D134-6 (FL-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 12
5. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY Disconnect the G8*1 and/or H6*2 front No. 1 speaker assembly connector. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 Always Approximately 4 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Front No. 1 Speaker Assembly) NG --> See step 13 OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (FRONT NO. 2 SPEAKER - FRONT NO. 1 SPEAKER) Disconnect the D81*1 and/or D10*2 front No. 2 speaker assembly connector. Disconnect the G8*1 and/or H6*2 front No. 1 speaker assembly connector. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance for RH for LH Tester Connection Condition Specified Condition D81-1 (+) - G8-1 Always Below 1 ohms D81-3 (-) - G8-2 Always Below 1 ohms D81-1 (+) - Body ground Always 10 kohms or higher D81-3 (-) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition D10-1 (+) - H6-1 Always Below 1 ohms D10-3 (-) - H6-2 Always Below 1 ohms D10-1 (+) - Body ground Always 10 kohms or higher D10-3 (-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 14
7. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY Disconnect the G8*1 and/or H6*2 front No. 1 speaker assembly connector. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 Always Approximately 4 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Front No. 1 Speaker Assembly) NG --> See step 15 OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - FRONT NO. 1 SPEAKER) Disconnect the D134 radio receiver assembly connector. Disconnect the G8*1 and/or H6*2 front No. 1 speaker assembly connector. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance for RH for LH Tester Connection Condition Specified Condition D134-1 (FR+) - G8-1 Always Below 1 ohms D134-5 (FR-) - G8-2 Always Below 1 ohms D134-1 (FR+) - Body ground Always 10 kohms or higher D134-5 (FR-) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition D134-2 (FL+) - H6-1 Always Below 1 ohms D134-6 (FL-) - H6-2 Always Below 1 ohms D134-2 (FL+) - Body ground Always 10 kohms or higher D134-6 (FL-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 16
9. INSPECT REAR SPEAKER ASSEMBLY Disconnect the L16*1 and K10*2 rear speaker assembly connectors. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 Always Approximately 4 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Rear Speaker Assembly) NG --> See step 17 OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - REAR SPEAKER) Disconnect the D135 radio receiver assembly connector. Disconnect the L16*1 and/or K10*2 rear speaker assembly connector. *1: for RH *2: for LH Measure the resistance according to the value(s) in the table below. Standard Resistance for RH for LH Tester Connection Condition Specified Condition D135-1 (RR+) - L16-1 Always Below 1 ohms D135-3 (RR-) - L16-2 Always Below 1 ohms D135-1 (RR+) - Body ground Always 10 kohms or higher D135-3 (RR-) - Body ground Always 10 kohms or higher Tester Connection Condition Specified Condition D135-2 (RL+) - K10-1 Always Below 1 ohms D135-6 (RL-) - K10-2 Always Below 1 ohms D135-2 (RL+) - Body ground Always 10 kohms or higher D135-6 (RL-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 18
11. REPLACE FRONT NO. 2 SPEAKER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S05994597132012081000000)
12. REPLACE RADIO RECEIVER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S28627906952012081000000)
13. REPLACE FRONT NO. 1 SPEAKER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S08125268462012081000000)
14. REPLACE FRONT NO. 2 SPEAKER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S05994597132012081000000)
15. REPLACE FRONT NO. 1 SPEAKER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S08125268462012081000000)
16. REPLACE RADIO RECEIVER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S28627906952012081000000)
17. REPLACE REAR SPEAKER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S17794286342012081000000)
18. REPLACE RADIO RECEIVER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S17794286342012081000000)

The radio receiver assembly sends a sound signal to the stereo component amplifier assembly through this circuit.

The sound signal that has been sent is amplified by the stereo component amplifier assembly, and then is sent to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly or speakers.

Scheme 143

Scheme 144

1. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY Disconnect the L5 stereo component amplifier assembly connector. Using an oscilloscope, check the signal waveform between each terminal and the body ground according to the conditions, as shown in the chart below. OK Tester Connection Condition Specified Condition L5-5 (R+) - Body ground Audio sound is being produced A waveform synchronized with sound is output L5-4 (R-) - Body ground L5-3 (L+) - Body ground L5-2 (L-) - Body ground TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Stereo Component Amplifier Assembly) NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER) Disconnect the D133 radio receiver assembly connector. Disconnect the L5 stereo component amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D133-9 (L+) - L5-3 (L+) Always Below 1 ohms D133-19 (L-) - L5-2 (L-) Always Below 1 ohms D133-8 (R+) - L5-5 (R+) Always Below 1 ohms D133-18 (R-) - L5-4 (R-) Always Below 1 ohms D133-9 (L+) - Body ground Always 10 kohms or higher D133-19 (L-) - Body ground Always 10 kohms or higher D133-8 (R+) - Body ground Always 10 kohms or higher D133-18 (R-) - Body ground Always 10 kohms or higher D133-10 (SGND) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S22866792472012081000000)
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-494220-S14334121792012081000000)

The multi-media interface ECU sends sound signals to the radio receiver assembly through this circuit.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, radio receiver assembly or speakers.

Scheme 145

Scheme 146

1. CHECK RADIO RECEIVER ASSEMBLY Using an oscilloscope, check the signal waveform between each terminal and the body ground according to the conditions, as shown in the chart below. OK Tester Connection Condition Specified Condition D60-2 (CDR+) - Body ground Audio sound is being produced A waveform synchronized with sound is output D60-3 (CDR-) - Body ground D60-4 (CDL+) - Body ground D60-5 (CDL-) - Body ground TEXT IN ILLUSTRATION *1 Component with harness connected (Radio Receiver Assembly) NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - RADIO RECEIVER) Disconnect the D66 multi-media interface ECU connector. Disconnect the D60 radio receiver assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D66-2 (URO+) - D60-2 (CDR+) Always Below 1 ohms D66-3 (URO-) - D60-3 (CDR-) Always Below 1 ohms D66-4 (ULO+) - D60-4 (CDL+) Always Below 1 ohms D66-5 (ULO-) - D60-5 (CDL-) Always Below 1 ohms D66-1 (USD1) - Body ground Always 10 kohms or higher D66-2 (URO+) - Body ground Always 10 kohms or higher D66-3 (URO-) - Body ground Always 10 kohms or higher D66-4 (ULO+) - Body ground Always 10 kohms or higher D66-5 (ULO-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-494220-S14334121792012081000000)
4. REPLACE MULTI-MEDIA INTERFACE ECU. Refer to «REMOVAL»(ref-494209-S33733798982012081000000)

The No. 1 stereo jack adapter assembly sends an external device sound signal to the radio receiver assembly through this circuit.

The sound signal that has been sent is amplified by the radio receiver assembly and then is sent to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the radio receiver assembly or speakers.

Scheme 147

Scheme 148

Scheme 149

1. CHECK RADIO RECEIVER ASSEMBLY Disconnect the D63 radio receiver assembly connector. Using an oscilloscope, check the signal waveform between each terminal and the body ground according to the conditions, as shown in the chart below. OK Tester Connection Condition Specified Condition D63-17 (ALI) - Body ground Audio sound is being produced A waveform synchronized with sound is output D63-15 (ARI) - Body ground TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Radio Receiver Assembly) NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO JACK ADAPTER) w/o USB Audio System Disconnect the D63 radio receiver assembly connector. Disconnect the D72 No. 1 stereo jack adapter assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D63-17 (ALI) - D72-1 (ALO) Always Below 1 ohms D63-15 (ARI) - D72-2 (ARO) Always Below 1 ohms D63-16 (ASGN) - D72-3 (ASGN) Always Below 1 ohms D63-18 (AGND) - D72-5 (AGND) Always Below 1 ohms D63-19 (AUXI) - D72-4 (AUXO) Always Below 1 ohms D63-17 (ALI) - Body ground Always 10 kohms or higher D63-15 (ARI) - Body ground Always 10 kohms or higher D63-16 (ASGN) - Body ground Always 10 kohms or higher D63-18 (AGND) - Body ground Always 10 kohms or higher D63-19 (AUXI) - Body ground Always 10 kohms or higher w/ USB Audio System Disconnect the D63 radio receiver assembly connector. Disconnect the D128 No. 1 stereo jack adapter assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D63-17 (ALI) - D128-6 Always Below 1 ohms D63-15 (ARI) - D128-5 Always Below 1 ohms D63-16 (ASGN) - D128-7 Always Below 1 ohms D63-18 (AGND) - D128-9 Always Below 1 ohms D63-19 (AUXI) - D128-8 Always Below 1 ohms D63-17 (ALI) - Body ground Always 10 kohms or higher D63-15 (ARI) - Body ground Always 10 kohms or higher D63-16 (ASGN) - Body ground Always 10 kohms or higher D63-18 (AGND) - Body ground Always 10 kohms or higher D63-19 (AUXI) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-494220-S14334121792012081000000)
4. REPLACE NO. 1 STEREO JACK ADAPTER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S05379137372012081000000)

The No. 1 stereo jack adapter assembly sends the sound data signal of an external device to the multi-media interface ECU through this circuit.

Scheme 150

This circuit sends a signal to the stereo component amplifier assembly to mute noise. Because of that, the noise produced by changing the sound source is muted.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.

If there is a short in the circuit, even though the stereo component amplifier assembly is normal, no sound, or only an extremely small sound, can be produced.

Scheme 151

Scheme 152

1. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY Disconnect the L5 stereo component amplifier assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition L5-1 (MUTE) - Body ground Ignition switch ACC, Audio system playing Above 3.5 V Audio system changing modes Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Stereo Component Amplifier Assembly) NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER) Disconnect the D133 radio receiver assembly connector. Disconnect the L5 stereo component amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D133-7 (MUTE) - L5-1 (MUTE) Always Below 1 ohms D133-7 (MUTE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-494209-S22866792472012081000000)
4. REPLACE PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-494220-S14334121792012081000000)

The multi-media interface ECU sends a mute signal to the radio receiver assembly.

The radio receiver assembly controls the volume according to the MUTE signal from the multi-media interface ECU.

The MUTE signal is sent to reduce noise and popping sounds generated when switching modes.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.

If there is a short in the circuit, even though the radio receiver assembly is functioning, no sound, or only an extremely faint sound, can be heard.

Scheme 153

Scheme 154

1. CHECK MULTI-MEDIA INTERFACE ECU Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D66-6 (MUT1) - Body ground Ignition switch ACC Above 3.5 V TEXT IN ILLUSTRATION *1 Component with harness connected (Multi-Media Interface ECU) NG --> See step 3 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - MULTI-MEDIA INTERFACE ECU) Disconnect the D60 radio receiver assembly connector. Disconnect the D66 multi-media interface ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D60-6 (MUTE) - D66-6 (MUT1) Always Below 1 ohms D60-6 (MUTE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
3. REPLACE MULTI-MEDIA INTERFACE ECU. Refer to «REMOVAL»(ref-494209-S33733798982012081000000)
4. REPLACE PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-494220-S14334121792012081000000)

Each unit of the audio system connected to the AVC-LAN (communication bus) transfers the signal of each switch by the communication bus.

When a short to +B or short to ground occurs in this AVC-LAN, the audio system will not function normally as the communication is discontinued.

Audio function

This circuit is necessary for the automatic sound levelizer (ASL) built into the stereo component amplifier assembly.

ASL function

Speed signals are received from the combination meter assembly and used for the ASL.

The ASL function automatically adjusts the sound in order to maintain clear audio sound even when vehicle noise increases (as vehicle noise increases, the volume is turned up, etc.).

HINT

1. A voltage of 12 V or 5 V is output from each ECU connected to the combination meter assembly, and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective systems based on the pulse signal.
2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, related components will not operate normally.

Scheme 155

SYSTEM DESCRIPTION

This circuit is used when the cellular phone voice in the "Bluetooth" handsfree system is on.

Scheme 156

1. Using this circuit, the radio receiver assembly sends power to the roof console box assembly (telephone microphone assembly), and the roof console box assembly sends microphone signals to the radio receiver assembly (w/o Manual (SOS) Switch).
2. Using this circuit, the telematics transceiver sends power to the roof console box assembly (telephone microphone assembly), and the roof console box assembly (telephone microphone assembly) sends microphone signals to the radio receiver assembly via the telematics transceiver. The radio receiver assembly and roof console box assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines (w/ Manual (SOS) Switch).

Scheme 157

This circuit provides power to the radio receiver assembly.

Scheme 158

This circuit provides power to the stereo component amplifier assembly.

Scheme 159

This circuit provides power to the multi-media interface ECU.

Scheme 160

Scheme 161

1. CHECK MULTI-MEDIA INTERFACE ECU Disconnect the D66 multi-media interface ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D66-12 (+B) - D66-7 (GND) Always 11 to 14 V D66-11 (ACC) - D66-7 (GND) Ignition switch ACC 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Multi-Media Interface ECU) NG --> See step 3 OK --> See step 2
2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-494220-S14334121792012081000000)
3. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - RADIO RECEIVER) Disconnect the D66 multi-media interface ECU connector. Disconnect the D60 radio receiver assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D66-11 (ACC) - D60-11 (ACC) Always Below 1 ohms D66-12 (+B) - D60-12 (+B) Always Below 1 ohms D66-7 (GND) - D60-7 (GND) Always Below 1 ohms D66-11 (ACC) - Body ground Always 10 kohms or higher D66-12 (+B) - Body ground Always 10 kohms or higher D66-7 (GND) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2

See also:
• REMOVAL