Cellular Communication: Diagnosis Lexus LS IV

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the LEXUS Link system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP
2. CHECK FOR DTC Check for current DTC (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). HINT: For the blinking pattern, refer to the «DIAGNOSIS SYSTEM»(ref-349763-S29402473292009120800000) and «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) . Result RESULT CHART Result Proceed to Blinking each code* A FAST1 B FAST2 C HINT: *: If blinking pattern 5-1 is output, check for DTCs using the Techstream. A: Go to «DIAGNOSTIC TROUBLE CODE CHART»(ref-349763-S32961945192009120800000) B: END C: Go to Next Step
3. CHECK FOR DTC Check for historic DTC (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ).
4. DIAGNOSTIC TROUBLE CODE CHART HINT: Even if the malfunction that caused the DTC output during the historic DTC check is fixed, the FAST2 blinking pattern of the current DTC will remain.
5. CLEAR HISTORIC DTC Clear historic DTC (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ).
6. CONFIRMATION TEST Check for current DTCs and confirm that the FAST1 blinking pattern occurs. NEXT: END

PROBLEM SYMPTOMS TABLE

HINT

1. Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

LEXUS Link system

LEXUS LINK SYSTEM SYMPTOM CHART

Scheme 36

Scheme 37

1. ARRANGEMENT OF MAYDAY ECU TERMINAL TERMINAL DESCRIPTION CHART Symbols (Terminal No.) Wiring Color Terminal Description +B (R24-1) L Vehicle battery power supply SPO+ (R24-2) L Audio speaker output + SPO- (R24-3) LG Audio speaker output - TACC (R24-7) R Microphone power supply MCI+ (R24-8) Y Microphone input signal + MCI- (R24-9) BR Microphone input signal - SPI+ (R24-10) L Sound signal SPI- (R24-11) LG Sound signal E (R24-12) BR Ground IG2 (R24-13) GR IG power supply ACC (R24-14) LG ACC power supply GSW(R24-16) L Airbag signal MCO+ (R24-17) Y Microphone output MCO- (R24-18) BR Audio ground SG (R24-19) Shielded Shield ground HFOF (R24-21) BE Phone mute MUTE (R24-22) L Radio mute MPX1 (R24-23) L MPX line BBI+ (R23-2) B Mayday battery input IND1 (R23-4) LG Red LED output SIG1 (R23-5) P Mayday switch input BBI- (R23-9) W Mayday battery input IND2 (R23-11) L Green LED output SIG- (R23-12) G Mayday switch ground SIG2 (R23-13) BE Mayday switch input WFSE (R23-14) G DLC3 line SIL (R23-15) R DLC3 line
2. CHECK MAYDAY ECU Disconnect the R24 and R23 ECU connectors. Measure the resistance and voltage according to the value(s) in the table below. TERMINAL DESCRIPTION CHART Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition R24-12 (E) - Body ground BR - Body ground Ground Always Below 1 ohms R24-1 (+B) - Body ground L - Body ground Vehicle battery power supply Always 11 to 14 V R24-14 (ACC) - Body ground LG - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V R24-13 (IG2) - Body ground GR - Body ground IG power supply Engine switch on (IG) 11 to 14 V R24-10 (SPI+) - R24-12 (E) L - BR Sound signal Audio system is playing Waveform synchronized with sound is output R24-11 (SPI-) - R24-12 (E) LG - BR Sound signal Audio system is playing Waveform synchronized with sound is output R24-21 (HFOF) - R24-12 (E) O - BR Phone mute Engine switch on (IG) 3.3 to 5.0 V R24-22 (MUTE) - R24-12 (E) L - BR Radio mute Engine switch on (IG) Approx. 5 V R23-2 (BBI+) - R24-9 (BBI-) B - W Non-rechargeble back-up Always 9 to 16 V R23-4 (IND1) - R23-12 (SIG-) LG - G Red LED output Engine switch off Approx. 56 kohms R23-5 (SIG1) - R23-12 (SIG-) P - G Mayday switch input Engine switch off, all buttons not pushed Approx. 4.7 kohms R23-11 (IND2) - R23-12 (SIG-) L - G Green LED output Engine switch off Approx. 56 kohms R23-13 (SIG2) - R23-12 (SIG-) BE - G Mayday switch input Engine switch off, all buttons not pushed Approx. 4.7 kohms If the result is not as specified, there may be a malfunction on the wire harness side. Disconnect the B telephone antenna (cellular phone) connector (color: blue) from the ECU. Measure the resistance according to the value (s) in the table below. TERMINAL DESCRIPTION CHART Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition B-1 (SIGNAL) - Body ground B - Body ground Telephone signal input/output Always Approx. 10 Kohms If the result is not as specified, there may be a malfunction on the antenna side.
3. CHECK BUS BUFFER ECU Disconnect the L93 ECU connector. Measure the resistance and voltage according to the value(s) in the table below. TERMINAL DESCRIPTION CHART Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition L93-4 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms L93-3 (+B) - Body ground R - Body ground Battery power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the L93 ECU connector. Measure the voltage according to the value(s) in the table below. TERMINAL DESCRIPTION CHART Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition L93-5 (S1) - L93-4 (GND) L - W-B MPX line Always Pulse generation If the result is not as specified, the ECU may have a malfunction.

Scheme 38

Scheme 39

1. DESCRIPTION When a system error is detected, the LEXUS Link system informs the driver of the error by illuminating the red LED on the map light. If the red LED is malfunctioning, the following voice warning is provided: "A system error has been detected. Please contact your LEXUS dealer."
2. CHECK BLINKING PATTERN (FAST1) Check current DTC (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). If the blinking pattern is the same as in the illustration, there is no problem. HINT: This blinking pattern is output when both of the following conditions are met: 1) there is a LEXUS Link service subscription, and 2) in data mode, there are no current or historic DTCs.
3. CHECK BLINKING PATTERN (FAST2) Check current DTC (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). If the blinking pattern is the same as in the illustration, a historic DTC exists. Perform repairs according to the diagnostic trouble code chart. HINT: This blinking pattern is output when both of the following conditions are met: 1) there is a LEXUS Link service subscription, and 2) in data mode, there is no current DTC but there is a historic DTC.

Scheme 40

1. DTC CHECK/CLEAR (Using Mayday Switch) HINT: Turn the engine switch on (IG), wait 5 seconds, and then check the DTC. Current DTC check With the engine switch on (IG), press and hold the PTT button, and then press the VOL+ button 5 times within 15 seconds. Historic DTC check With the engine switch on (IG), press and hold the PTT button, and then press the VOL- button 5 times within 15 seconds. Clear historic DTC With the engine switch on (IG), press and hold the PTT button, and then press the door unlock switch of the power window regulator master switch 5 times within 15 seconds.
2. DTC CHECK/CLEAR (Using Techstream) Check DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical/Mayday Gateway/Trouble Codes. Read the DTCs. Clear DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical/Mayday Gateway/Trouble Codes. Erase the DTCs.
3. LED BLINKING PATTERN When the system is in the diagnosis mode, the red and green LEDs on the mayday switch will blink in the applicable pattern. The blinking pattern shown in the illustration is an example of DTC 3-2 and 4-3. DTCs will be output in numerical order. A set of DTC blinking patterns will be output twice.
4. EXIT DIAGNOSIS MODE Diagnosis mode can be exited by turning the engine switch off.
5. INFRASTRUCTURE TROUBLESHOOTING LEXUS Link system LEXUS LINK SYSTEM SYMPTOM CHART Item Symptom Cause Check Method Countermeasure Activation Cannot be activated Infrastructure Mayday ECU Check if phone connects to LEXUS Link call center when SERVICES button is pressed If it does, problem may be in LEXUS Link call center/infrastructure If mayday ECU is within cover service area of system, replace it*1 If problem is in LEXUS Link call center/infrastructure, Inform TMS and request repairs If problem is in mayday ECU, replace it*1 In some cases, moving vehicle to another location and trying to activate service connection again can solve problem Service Call Emergency Call Cannot connect to LEXUS Link call center Connection retry frequently occurs Infrastructure Telephone antenna (Cellular phone antenna)*2 Mayday ECU Run vehicle, check whether connection is related to place or area*3 If it is not related to place or area, problem may be in may day ECU or telephone antenna (cellular phone antenna)*2 If it is related to place or area, problem may be in Infrastructure If problem is not infrastructure, check wiring connection of telephone antenna (cellular phone antenna)*2 If there are no connection problems, check mayday ECU Cannot connect to LEXUS Link call center Connection retry frequently occurs Infrastructure Setup of infrastructure may be wrong Cellular carrier in area is not set up to accept Mobile Identification Number (MIN) for mayday ECU on vehicle Inform TMS and request setup Disconnection immediately after connection Infrastructure Telephone antenna (Cellular phone antenna)*2 Mayday ECU Run vehicle, check whether connection is related to place or area*3 If It is not related to place or area, problem may be in mayday ECU or telephone antenna (cellular phone antenna)*2 If it is related to place or area, problem may be in infrastructure If problem is not Infrastructure, check wiring connection of telephone antenna (cellular phone antenna)*2 If there are no problems with above areas, check mayday ECU After connecting to LEXUS Link call center and driving long distance, connection worsens Infrastructure There is difference between registered information of location during activation and information in current location, leading to bad LEXUS Link call center connection Contact LEXUS Link call center with service call, ask to change registration Information and download setup Information again LEXUS Link system has no response after messages "Connecting to LEXUS Link" or "Connecting to LEXUS Link Emergency" Infrastructure Telephone antenna (Cellular phone Antenna)*2 Mayday ECU Run vehicle, check whether connection is related to place or area*3 If it is not related to place or area, problem may be in mayday ECU or telephone antenna (cellular phone antenna)*2 If It is related to place or area, problem may be in infrastructure Cellular electronic wave condition in area may cause this problem As vehicle data reaches LEXUS Link call center, call center will call back to vehicle Communication quality is abnormal Infrastructure LEXUS Link system Run vehicle, check whether connection is related to place or area*3 If it is not related to place or area, problem may be in mayday ECU or telephone antenna (cellular phone antenna)*2 If it is related to place or area, problem may be in Infrastructure If problem is not in Infrastructure, check vehicle equipment such as mayday switch, etc. HINT: *1: If replacement of the ECU is necessary, replace the mayday battery (backup battery) together with the ECU. After the replacement, register the ECU. *2: Telephone antenna includes peripheral parts such as the telephone antenna rod, telephone antenna base, antenna wire, etc. *3: When running the vehicle, make sure it is in the LEXUS Link service area. If on a level surface, the vehicle may only need to be driven a short distance before a connection can be made. If in a mountainous area, the vehicle may have to be driven a long distance before the connection can be made.

DATA LIST/ACTIVE TEST

1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensor, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical/Mayday Gateway/Data List. According to the display on the Techstream, read the "Data List". Mayday Gateway MAYDAY GATEWAY REFERRENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Lost Message from Vehicle Bus Number of transmission buffer overrides (V BUS)/ 0 to 255 0 - Lost Message from Mayday Bus Number of transmission buffer overrides (mayday ECU)/ 0 to 255 0 - Send Wait-Frame Number of Wait-frame transmissions/ 0 to 255 0 - Mayday ECU 1 ECU judgment/ WITH or WITHOUT WITH - Mayday ECU 2 ECU judgment/ WITH or WITHOUT WITHOUT - Mayday ECU 3 ECU judgment/ WITH or WITHOUT WITHOUT - Mayday ECU 4 ECU judgment/ WITH or WITHOUT WITHOUT - Wakeup from Vehicle Bus Wakeup judgment (V BUS)/ YES or NO YES - Wakeup from Mayday Bus Wakeup judgment (mayday ECU)/ YES or NO YES - Battery Voltage Vehicle battery voltage 0 to 25.5 [V] Displays present battery state - #DTC Number of diagnosis codes

DIAGNOSTIC TROUBLE CODE CHART

HINT

If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "DTC Code" below.

Mayday ECU (map light LED blinking pattern)

MAYDAY ECU - DIAGNOSTIC TROUBLE CODE CHART

Bus buffer ECU [Mayday Gateway] (tester display)

BUS BUFFER ECU - DIAGNOSTIC TROUBLE CODE CHART

INSPECTION PROCEDURE

The LEXUS Link service cannot be received. Subscribe to the LEXUS Link service.

1. CHECK MAYDAY ECU Press the SERVICES button and check the LEXUS Link condition with the LEXUS Link call center. OK: System operates normally. NG: System does not connect to LEXUS Link call center. (Current DTC 1-2 exists.) NG: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION OK: END

1. RESET MAYDAY ECU Exit diagnosis mode and wait for 10 seconds. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. Disconnect the cable from the negative (-) battery terminal, and wait for 1 minute. Reconnect the cable to the negative (-) battery terminal, and wait for 10 seconds. Turn the engine switch on (IG), and then check for the current DTC and historic DTC again (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). Result RESULT CHART Result Proceed to Current DTC 2-1 or 2-2 exists A Historic DTC 2-1 or 2-2 exists B B: CLEAR HISTORIC DTC (See «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ) A: Go to Next Step
2. CHECK MAYDAY ECU Press the SERVICES button and check the LEXUS Link condition with the LEXUS Link call center. OK: System operates normally. NG: System does not connect to LEXUS Link call center. (Current DTC 2-1 or 2-2 exists.) NG: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION OK: END

1. RESET MAYDAY ECU Exit diagnosis mode and wait for 10 seconds. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. Disconnect the cable from the negative (-) battery terminal, and wait for 10 minutes. Reconnect the cable to the negative (-) battery terminal, and wait for 10 seconds. Turn the engine switch on (IG), and then check for the current DTC and historic DTC again (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). Result RESULT CHART Result Proceed to Current DTC 2-3 or 2-4 exists A Historic DTC 2-3 or 2-4 exists B B: CLEAR HISTORIC DTC (See «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ) A: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

1. RESET MAYDAY ECU Exit diagnosis mode and wait for 10 seconds. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. Disconnect the cable from the negative (-) battery terminal, and wait for 10 minutes. Reconnect the cable to the negative (-) battery terminal, and wait for 10 seconds. Turn the engine switch on (IG). Keep the engine switch on (IG) for 5 minutes or more. Check for DTC again (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). Result RESULT CHART Result Proceed to Current DTC 2-6 exists A Current DTC 2-6 does not exist B B: CLEAR HISTORIC DTC (See «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ) A: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

1. CHECK GPS ANTENNA OPERATION Check that there are no objects that may cause interference to the antenna in the surrounding area. Press the SERVICES button 10 minutes after turning the engine switch on (IG). Then check that the information on the vehicle location from the GPS satellite matches the information from the LEXUS Link call center. OK: Telephone antenna (GPS antenna) operates normally. NG: GO TO «DTC CHART»(ref-349763-S32961945192009120800000) OK: END (AFFECTED BY SURROUNDING CONDITIONS; CLEAR HISTORIC DTC)

1. CHECK FOR DTC (BLINKING PATTERN) Turn the engine switch from on (IG) to off. Turn the engine switch on (IG) and wait for 10 seconds. Check for the DTC again and wait for 20 seconds (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). OK: DTC 5-1 is not output. NG: Go to step 2 OK: CLEAR HISTORIC DTC (See «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) )
2. CHECK FOR DTC Check for DTC using the Techstream (see «DIAGNOSIS SYSTEM»(ref-349742-S42827894432009120800000) ). HINT: The bus buffer ECU is connected to the CAN. Check that there are no CAN communication system DTCs present. Result RESULT CHART Result Proceed to No DTC A Related to CAN communication system B HINT: The "U" code is a CAN communication system code. B: GO TO CAN COMMUNICATION SYSTEM (See «CAN COMMUNICATION SYSTEM»(ref-349742-S22957258702009120800000) ) A: Go to Next Step
3. CHECK HEADLIGHT DIMMER SWITCH When the headlight dimmer switch is set to the low beam position, check that the hazard switch illuminates. HINT: The mayday ECU uses the communication stop judgment to check for the dim signal from the main body ECU. OK: Hazard switch illuminates. NG: GO TO LIGHTING SYSTEM (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-349731-S34433163662009120800000) ) OK: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION

1. REPLACE MAYDAY BATTERY (BACKUP BATTERY) Replace the mayday battery. Perform registration (see «REGISTRATION»(ref-349763-S32444564622009120800000) ). Check for DTC again (see «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) ). OK: Current DTC 6-1 is not output. NG: PERFORM REGISTRATION AGAIN (See «REGISTRATION»(ref-349763-S32444564622009120800000) ) OK: CLEAR HISTORIC DTC (See «DTC CHECK/CLEAR»(ref-349763-S29713030792009120800000) )

1. CHECK VEHICLE BATTERY Check the vehicle battery (see «ON-VEHICLE INSPECTION»(ref-349732-S35552932422009120800000) ). Standard voltage: 11 to 14 V NG: RECHARGE OR REPLACE VEHICLE BATTERY OK: GO TO «ECU POWER SOURCE CIRCUIT (MAYDAY ECU)»(ref-349763-S30394459922009120800000)

HINT

1. This DTC is only a historic DTC.
2. This DTC is for reference.