Audio / Visual (Diagnostics - Introduction): Diagnosis Lexus IS II facelift

HOW TO PROCEED WITH TROUBLESHOOTING

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
3. BASIC INSPECTION Turn the engine switch on (IG). Check whether or not the radio receiver turns on. Result Result Proceed to Radio receiver turns on A Radio receiver does not turn on B B --> Go to step 6 A: Go to next step
4. CHECK FOR DTC Check for DTCs and note any codes that are output. Delete the DTCs. Recheck by simulating the operation indicated by the DTC. HINT: If the system cannot enter the diagnosis mode, inspect the AVC-LAN and all the components that connect to the AVC-LAN for short circuits and repair or replace the problem part. Even if the malfunction symptom is not confirmed, check the DTCs. This is because the system stores past DTCs. Check and clear past DTCs. Then check for DTCs. Result Result Proceed to DTC is output again A DTC is not output B B --> Go to step 6 A: Go to next step
5. DIAGNOSTIC TROUBLE CODE CHART Find the output code on the diagnostic trouble code chart . Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-387469-S35836257102011022400000) . NEXT --> Go to step 8
6. PROBLEM SYMPTOMS TABLE Refer to the problem symptoms table . Refer to «PROBLEM SYMPTOMS TABLE»(ref-387469-S35495030182011022400000) . Result Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B B --> Go to step 8 A: Go to next step
7. OVERALL ANALYSIS AND TROUBLESHOOTING Terminals of ECU . Refer to «TERMINALS OF ECU»(ref-387469-S02295999392011022400000) . NEXT: Go to next step
8. ADJUST, REPAIR OR REPLACE NEXT: Go to next step
9. CONFIRMATION TEST NEXT --> END

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Scheme 99

1. Radio Description Radio frequency band Radio broadcasts use the radio frequency bands shown in the table below. Service area The service areas of AM and FM broadcasts are vastly different. Sometimes an AM broadcast can be received very clearly but an FM stereo cannot. FM stereo has the smallest service area, and is prone to pick up static and other types of interference such as noise. Radio reception problems HINT: In addition to static, other problems such as "phasing", "multipath", and "fade out" exist. These problems are not caused by electrical noise, but by the radio signal propagation method itself. Phasing AM broadcasts are susceptible to electrical interference and another kind of interference called phasing. Occurring only at night, phasing is the interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off the ionosphere and the other signal is received directly from the transmitter. Multipath Multipath is a type of interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off buildings or mountains and the other signal is received directly from the transmitter. Fade out Fade out is caused by objects (buildings, mountains, and other such large obstacles) that deflect away part of a signal, resulting in a weaker signal when the object is between the transmitter and vehicle. High frequency radio waves, such as FM broadcasts, are easily deflected by obstructions. Low frequency radio waves, such as AM broadcasts, are much more difficult to deflect. Noise problem Technicians must have a clear understanding about each customer's noise complaint. Use the following table to diagnose noise problems. Radio Frequency Noise Occurrence Condition Presumable Cause AM Noise occurs in a specified area Foreign noise AM Noise occurs when listening to an intermittent broadcast An identical program transmitted from multiple towers can cause noise where the signals overlap AM Noise occurs only at night Music beat from a distant broadcast FM Noise occurs while driving in a specified area Multipath or phasing noise resulting from a change in FM frequency HINT: If the noise does not match the examples above, refer to the descriptions about phasing and multipath.

PROBLEM SYMPTOMS TABLE

HINT

1. Before inspecting the suspected areas listed in the table below, check the fuse and relay.
2. Before inspecting the suspected areas listed in the table below, check for DTCs.
3. Methods used to verify the cause of the problem are listed in order of probability in the suspected area column.

AUDIO FUNCTION

STEERING PAD SWITCH FUNCTION

Scheme 100

Scheme 101

Scheme 102

Scheme 103

1. RADIO RECEIVER Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification B (J66-1) - GND (J66-20) G - W-B Battery Always 10 to 14 V ILL+ (J66-2) - GND (J66-20) G - W-B Illumination signal Light control switch OFF Below 1 V ILL+ (J66-2) - GND (J66-20) G - W-B Illumination signal Light control switch TAIL 10 to 14 V ATX+ (J66-5) - ATX- (J66-15) V - P AVC-LAN communication signal Turn engine switch on (ACC) 2 to 3 V MUTE (J66-7) - GND (J66-20) BR - W-B Mute signal Audio system is playing Above 3.5 V MUTE (J66-7) - GND (J66-20) BR - W-B Mute signal Audio system is changing Below 1 V R+ (J66-8) - GND (J66-20) R - W-B Sound signal (Right) Audio system is playing A waveform synchronized with sounds is output L+ (J66-9) - GND (J66-20) B - W-B Sound signal (Left) Audio system is playing A waveform synchronized with sounds is output SLD (J66-10) - Body ground Shielded - Body ground Shielded ground Always Below 1 V ACC (J66-11) - GND (J66-20) BE - W-B Accessory (ON) Turn engine switch off Below 1 V ACC (J66-11) - GND (J66-20) BE - W-B Accessory (ON) Turn engine switch on (ACC) 10 to 14 V ILL- (J66-12) - GND (J66-20) W - W-B Illumination signal Light control switch OFF Below 1 V ILL- (J66-12) - GND (J66-20) W - W-B Illumination signal Light control switch TAIL 10 to 14 V ANT (J66-13) - GND (J66-20) Y - W-B Power source of antenna Radio switch ON and AM or FM 10 to 14 V R- (J66-18) - GND (J66-20) G - W-B Sound signal (Right) Audio system is playing A waveform synchronized with sounds is output L- (J66-19) - GND (J66-20) W - W-B Sound signal (Left) Audio system is playing A waveform synchronized with sounds is output GND (J66-20) - Body ground W-B - Body ground Ground Always Below 1 V SWG (J63-6) - GND (J66-20) GR - W-B Steering pad switch ground Always Below 1 V SW1 (J63-7) - GND (J66-20) SB - W-B Steering pad switch signal Steering pad switch not operated 4 V or more SW1 (J63-7) - GND (J66-20) SB - W-B Steering pad switch signal SEEK+ switch pushed Approx. 0.5 V SW1 (J63-7) - GND (J66-20) SB - W-B Steering pad switch signal SEEK- switch pushed Approx. 0.9 V SW1 (J63-7) - GND (J66-20) SB - W-B Steering pad switch signal VOL+ switch pushed Approx. 2.0 V SW1 (J63-7) - GND (J66-20) SB - W-B Steering pad switch signal VOL- switch pushed Approx. 3.4 V SW2 (J63-8) - GND (J66-20) L - W-B Steering pad switch signal Steering pad switch not operated 4 V or more SW2 (J63-8) - GND (J66-20) L - W-B Steering pad switch signal MODE switch pushed Approx. 0.5 V SW2 (J63-8) - GND (J66-20) (*1) L - W-B Steering pad switch signal ON HOOK switch pushed Approx. 0.9 V SW2 (J63-8) - GND (J66-20) (*1) L - W-B Steering pad switch signal OFF HOOK switch pushed Approx. 2.0 V SW2 (J63-8) - GND (J66-20) (*1) L - W-B Steering pad switch signal VOICE switch pushed Approx. 3.4 V TX+ (J63-9) - TX- (J63-10) (*4) SB - BE AVC-LAN communication signal Turn engine switch on (ACC) 2 to 3 V TX+ (J63-9) - TX- (J63-10) (*1) P - LG AVC-LAN communication signal Turn engine switch on (ACC) 2 to 3 V ARI (J63-15) - GND (J66-20) (*2) R - W-B Sound signal (Right) External device is playing (When stereo jack adapter is used) A waveform synchronized with sounds is output ASGN (J63-16) - GND (J66-20) (*2) B - W-B Ground Always Below 1 V ALI (J63-17) - GND (J66-20) (*2) W - W-B Sound signal (Left) External device is playing (When stereo jack adapter is used) A waveform synchronized with sounds is output AUXI (J63-19) - GND (J66-20) (*2) L - W-B External device connection detection signal External device is connected Below 1 V ARI (J61-2) - GND (J66-20) (*3) R - W-B Sound signal (Right) External device is playing (When stereo jack adapter is used) A waveform synchronized with sounds is output ASGN (J61-5) - GND (J66-20) (*3) B - W-B Ground Always Below 1 V ALI (J61-3) - GND (J66-20) (*3) W - W-B Sound signal (Left) External device is playing (When stereo jack adapter is used) A waveform synchronized with sounds is output AUXI (J61-6) - GND (J66-20) (*3) L - W-B External device connection detection signal External device is connected Below 1 V NTSC (J62-1) - GND (J66-20) (*1, *3) R - W-B DVD image signal DVD played on multi-display Pulse generation (Scheme 101)GND (J62-2) - Body ground (*1, *3) G - Body ground Ground Always Below 1 V SLD (J62-3) - Body ground (*1, *3) Shielded - Body ground Shielded - Body ground Always Below 1 V TXM+ (J65-9) - TXM- (J65-10) (*4) BR - R AVC-LAN communication signal Turn engine switch on (ACC) 2 to 3 V DVD (s1-1) - GND (J66-20) (*3) B - W-B Digital sound signal DVD played on multi-display Pulse generation *1: with Navigation System *2: for CD Changer Models *3: for DVD Changer Models *4: without Navigation System Reference: waveform 1 HINT: Terminal: NTSC - Body ground Setting: 200 mV/DIV, 10 μs/DIV Condition: DVD display is ON.
2. INTEGRATION CONTROL & PANEL ASSEMBLY (WITHOUT NAVIGATION SYSTEM) Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification TX- (J54-1) - TX+ (J54-2) R - BR AVC-LAN communication signal Turn engine switch on (ACC) 2 to 3 V IG+ (J54-4) - E (J54-8) B - W-B Ignition switch (ON) Turn engine switch on (IG) 10 to 14 V IG+ (J54-4) - E (J54-8) B - W-B Ignition switch (OFF) Turn engine switch off Below 1 V ACC (J54-5) - E (J54-8) BE - W-B Accessory (OFF) Turn engine switch off Below 1 V ACC (J54-5) - E (J54-8) BE - W-B Accessory (ON) Turn engine switch on (ACC) 10 to 14 V E (J54-8) - Body ground W-B - Body ground Ground Always Below 1 V B (J54-14) - E (J54-8) LG - W-B Battery Always 10 to 14 V
3. STEREO COMPONENT AMPLIFIER Symbols (Terminal No.) Wiring Color Terminal Description Condition Specification +B (P27-1) - GND (P27-2) R - W-B Battery Always 10 to 14 V GND (P27-2) - Body ground W-B - Body ground Ground Always Below 1 V +B2 (P27-3) - GND (P27-2) SB - W-B Battery Always 10 to 14 V GND2 (P27-6) - Body ground W-B - Body ground Ground Always Below 1 V WF1+ (P28-1) - GND (P27-2) BR - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output WF2+ (P28-2) - GND (P27-2) (*1) P - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output SR+ (P28-2) - GND (P27-2) (*2) SB - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output MR+ (P28-3) - GND (P27-2) (*1) B-W - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output CTR+ (P28-3) - GND (P27-2) (*2) Y - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output WFL+ (P28-4) - GND (P27-2) W - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output WF1- (P28-5) - GND (P27-2) LG - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output WF2- (P28-6) - GND (P27-2) (*1) SB - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output SR- (P28-6) - GND (P27-2) (*2) R - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output ML- (P28-7) - GND (P27-2) (*1) L - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output SL- (P28-7) - GND (P27-2) (*2) L - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output ML+ (P28-8) - GND (P27-2) (*1) LG - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output SL+ (P28-8) - GND (P27-2) (*2) LG - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output MR- (P28-9) - GND (P27-2) (*1) R - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output CTR- (P28-9) - GND (P27-2) (*2) B - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output WFL- (P28-10) - GND (P27-2) R - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output WFR+ (P29-1) - GND (P27-2) BR - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output FL+ (P29-2) - GND (P27-2) SB - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output RL+ (P29-3) - GND (P27-2) P - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output RR+ (P29-4) - GND (P27-2) R - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output WFR- (P29-5) - GND (P27-2) P - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output FL- (P29-6) - GND (P27-2) G - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output FR- (P29-7) - GND (P27-2) GR - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output FR+ (P29-8) - GND (P27-2) B - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output RL- (P29-9) - GND (P27-2) V - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output RR- (P29-10) - GND (P27-2) W - W-B Sound signal Audio system is playing A waveform synchronized with sounds is output MUTE (P30-1) - GND (P27-2) SB - W-B Mute signal Audio system is playing Above 3.5 V MUTE (P30-1) - GND (P27-2) SB - W-B Mute signal Audio system is changing Below 1 V L- (P30-2) - GND (P27-2) W - W-B Sound signal (Left) Audio system is playing A waveform synchronized with sounds is output L+ (P30-3) - GND (P27-2) B - W-B Sound signal (Left) Audio system is playing A waveform synchronized with sounds is output R- (P30-4) - GND (P27-2) G - W-B Sound signal (Right) Audio system is playing A waveform synchronized with sounds is output R+ (P30-5) - GND (P27-2) R - W-B Sound signal (Right) Audio system is playing A waveform synchronized with sounds is output SLD (P30-6) - Body ground Shielded - Body ground Shielded ground Always Below 1 V TX- (P30-7) - TX+ (P30-8) V - BE AVC-LAN communication signal Turn engine switch on (ACC) 2 to 3 V SPD (P30-11) - GND (P27-2) L - W-B Speed signal Turn engine switch on (IG), drive wheels are turned slowly Pulse generation ACC (P30-12) - GND (P27-2) BE - W-B Accessory (ON) Turn engine switch off Below 1 V ACC (P30-12) - GND (P27-2) BE - W-B Accessory (ON) Turn engine switch on (ACC) 10 to 14 V II1- (P30-14) - GND (P27-2) (*3) BR - W-B Voice guidance signal Voice guidance is provided A waveform synchronized with sounds is output II1+ (P30-15) - GND (P27-2) (*3) Y - W-B Voice guidance signal Voice guidance is provided A waveform synchronized with sounds is output DVD (t1-1) - GND (P27-2) (*4) B - W-B Digital sound signal DVD played on multi-display Pulse generation *1: without Front Center Speaker *2: with Front Center Speaker *3: with Navigation System *4: for DVD Changer Models
4. GATEWAY ECU

DTC CHECK / CLEAR

HINT

If the system cannot enter the diagnostic mode, inspect all AVC-LAN communication signals and repair or replace problem parts.

Refer to AVC-LAN Circuit

Scheme 104

Scheme 105

Scheme 106

Scheme 107

Scheme 108

Scheme 109

Scheme 110

1. ENTERING DIAGNOSTIC MODE Turn the engine switch on (ACC). Turn off the audio system. While pressing the preset switches "1" and "6" at the same time, press the "DISC" switch 3 times. HINT: A beep is emitted 3 times and the diagnostic function is activated. The system enters the all element illumination mode and the switch check mode.
2. ALL ELEMENT ILLUMINATION MODE AND SWITCH CHECK MODE HINT: Illumination status of all switches and operations of the panel switches can be checked. Check that all elements are on. When pressing each panel switch, check that a beep is emitted. NOTE: Pressing the "SEEK TRACK UP" switch transfers the screen to the stereo jack adapter connection check screen. Check the operation of this switch by confirming the transfer of the screen.
3. STEREO JACK ADAPTER CONNECTION CHECK MODE Press the "SEEK TRACK UP" switch. Check if the stereo jack adapter is recognized. HINT: Vehicles that do not have a stereo jack adapter also have this function. NOTE: This function is not to check connection information on an external device, but to check recognition information on a stereo jack adapter.
4. SERVICE CHECK MODE Press the "SEEK TRACK UP" switch. HINT: For details of the service check mode, refer to "6. CHECK DTC" and "7. DTC CLEAR/RECHECK".
5. FINISHING DIAGNOSTIC MODE Press the "DISC" switch for 2 seconds or more, or turn the ignition switch off.
6. CHECK DTC HINT: Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore, some detailed areas may not be shown exactly the same as on the actual vehicle. Reference: In the system check mode, the system check and the diagnostic memory check are performed, and the check results are displayed in ascending order of the component codes (physical address). Terms Meaning Component code (Physical address) Three-digit code (in hexadecimal) given to each device comprising AVC-LAN. Corresponding to its function, individual symbol is provided. Logical address Two-digit code (in hexadecimal) given to each function and device unit in each device comprising AVC-LAN. Service check result display Display Previous term Meaning Action to be taken good Good (normal) No DTCs are detected in both "System Check Mode" and "Diagnostic Memory Mode". - nCon No connection The system recognized the component when it was registered, but the component gives no response to the "Diagnostic Mode ON Request". Check the power source circuit and the communication circuit of the component indicated by the component code (physical address). ECHn Exchange One or more DTCs for "Exchange" are detected in either "System Check Mode" or "Diagnostic Memory Mode". Go to the detailed information mode to check the trouble area referring to the DTC list. CHEC Check When no DTCs are detected for "Exchange", one or more DTCs for "Check" are detected in either "System Check Mode" or "Diagnostic Memory Mode". Go to the detailed information mode to check the trouble area referring to the DTC list. OLd Old version Old DTC application is identified and DTC is detected in either "System Check Mode" or "Diagnostic Memory Mode". - nrES No response The device gives no response to any one of "System Check Mode ON Request", "System Check Result Request", and "Diagnostic Memory Request". Check the power source circuit and the communication circuit of the component indicated by the component code (physical address). Device name and physical address Physical address No. Name 190 Radio receiver 440 Stereo component amplifier 1C6 Gateway ECU 1D8 Integration control & panel assembly Service check mode Press the "SEEK TRACK" switch to see the check result of each component. The component code (physical address) is displayed first, and then the check result follows. HINT: If all check results are "good", the system judges that no DTC exists. If the preset switch "1" is pressed in the service check mode, service check is performed again. This illustration is only an example and may differ in cases such as for each option part and output DTCs. Detailed information mode 1 HINT: "Detailed information mode 1" is displayed when there is no response to "System Check Result Request" and DTC is detected only in "Diagnostic Memory Request". The component device code (physical address) is displayed first, and then the check result follows. This illustration is only an example and may differ in cases such as for each option part and output DTCs. Press the preset switch "2" to go to the "Detailed Information Mode 1". Press the "SEEK TRACK" switch to display the physical address and DTC of the component. Press the preset switch "3" to go to the "Service Check Mode". Distinguish between the displays of the responses to "System Check Result Request" and "Diagnostic Memory Request". In order to distinguish the information detected in "System Check Mode" and "Diagnostic Memory Mode" in "ECHn", "CHEC", and "OLd" in "Detailed Information Mode 1", refer to the following: "SyS" is displayed before the detailed codes detected as a result of "System Check Result Request" are displayed. "COdE" is displayed before the detailed codes detected as a result of "Diagnostic Memory Request" are displayed. HINT: The response to "System Check Result Request" is the current information given from each ECU as a result of the system check. The response to "Diagnostic Memory Request" contains the information received from each ECU or stored in each ECU in the past. The response to "Diagnostic Memory Request" is the output DTCs as a result of the diagnostic memory check or the DTCs received from each ECU. "System Check Result Request (SyS)" is displayed first, and then the logical address and DTC appear in order. "Diagnostic Memory Request (COdE)" is displayed first, and then the logical address, DTC, sub-code, connection check number, and the number of occurrence appear in order. Detailed information mode 2 HINT: "Detailed information mode 2" is displayed when DTCs are detected in the responses to both "System Check Result Request" and "Diagnostic Memory Request". The component device code (physical address) is displayed first, and then the check result follows. This illustration is only an example and may differ in cases such as for each option part and output DTCs. Press the preset switch "2" to go to the "Detailed Information Mode 2". Press the "SEEK TRACK" switch to display the physical address and DTC of the component. Press the preset switch "3" to go to the "Service Check Mode". Distinguish between the displays of the responses to "System Check Result Request" and "Diagnostic Memory Request". In order to distinguish the information detected in "System Check Mode" and "Diagnostic Memory Mode" in "ECHn", "CHEC", and "OLd" in "Detailed Information Mode 2", refer to the following: "SyS" is displayed before the detailed codes detected as a result of "System Check Result Request" are displayed. "COdE" is displayed before the detailed codes detected as a result of "Diagnostic Memory Request" are displayed. HINT: The response to "System Check Result Request" is the current information given from each ECU as a result of the system check. The response to "Diagnostic Memory Request" contains the information received from each ECU or stored in each ECU in the past. The response to "Diagnostic Memory Request" is the output DTCs as a result of the diagnostic memory check or the DTCs received from each ECU. "System Check Result Request (SyS)" is displayed first, and then the logical address and DTC appear in order. "Diagnostic Memory Request (COdE)" is displayed first, and then the logical address, DTC, sub-code, connection check number, and the number of occurrence appear in order.
7. DTC CLEAR/RECHECK Clearing All DTC Memory (when clearing all the memory of the DTCs previously detected). When the preset switch "5" is pressed for 2 seconds or more during "Service Check Mode", the DTCs for all components are cleared. ("CLr" is displayed at this time.) HINT: A beep sound is emitted once when the DTC memory is completely cleared. When the DTC memory for all the components is cleared, only the component codes (physical address) are displayed. After the DTC memory is cleared, the "Service Check Mode" is restored. Clearing Individual DTC Memory (when clearing the memory of the DTC previously detected individually). When the preset switch "5" is pressed for 2 seconds or more during "Detailed Information Mode 1" or "Detailed Information Mode 2", the DTCs for the target component are cleared. HINT: A beep sound is emitted once when the DTC memory is completely cleared. When the DTC memory is cleared, only the component code (physical address) is displayed for the target component. After the DTC memory is cleared, the "Service Check Mode" is restored. To check DTCs, press the preset switch "1" and perform the system check again. Press the preset switch "1" to perform the service check again, and check that no DTCs are displayed for all the component codes (physical address).

DIAGNOSTIC TROUBLE CODE CHART

COMMUNICATION DIAGNOSIS

RADIO UNIT

IN-DASH CD CHANGER

VOL