Cellular Communication (Dianostics - Introduction): Diagnosis Lexus LX J200

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 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. CHECK FOR DTC Check for current DTCs. Refer to «DTC CHECK / CLEAR»(ref-385285-S27742832902011021400000) . HINT: For the blinking pattern, refer to the Diagnosis System. Refer to «DIAGNOSIS SYSTEM»(ref-385285-S06971252242011021400000) and DTC Check / Clear. Refer to «DTC CHECK / CLEAR»(ref-385285-S27742832902011021400000) . RESULT 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. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-385285-S23938039602011021400000) B --> END C: Go to next step
4. CHECK FOR DTC Check for historic DTCs. Refer to «DTC CHECK / CLEAR»(ref-385285-S27742832902011021400000) . NEXT: Go to next step
5. 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. NEXT: Go to next step
6. CLEAR HISTORIC DTC Clear historic DTCs. Refer to «DTC CHECK / CLEAR»(ref-385285-S27742832902011021400000) . NEXT: Go to next step
7. CONFIRMATION TEST Check for current DTCs and confirm that the FAST1 blinking pattern occurs. NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.

LEXUS LINK SYSTEM

Scheme 434

Scheme 435

1. CHECK TELEPHONE ECU ASSEMBLY Arrangement of telephone ECU assembly terminal. Terminal No. (Symbol) Wiring Color Terminal Description P2-1 (+B) G Vehicle battery power supply P2-2 (SPO+) W Audio speaker output + P2-3 (SPO-) B Audio speaker output - P2-7 (MCVD) Y Microphone power supply P2-8 (MCI+) G Microphone input signal + P2-9 (MCI-) R Microphone input signal - P2-10 (SPI+) W Sound signal P2-11 (SPI-) B Sound signal P2-12 (E) W-B Ground P2-13 (IG2) B IG power supply P2-14 (ACC) GR ACC power supply P2-16 (GSW) L Airbag signal P2-17 (MCO+) G Microphone output P2-18 (MCO-) R Audio ground P2-19 (SGND) Shielded Shield ground P2-21 (HFOF) B Phone mute P2-22 (MUTE) B Radio mute P2-23 (MPX1) B MPX line P3-2 (BBI+) R Mayday battery input P3-4 (IND1) L Red LED output P3-5 (SIG1) W Mayday switch input P3-9 (BBI-) L Mayday battery input P3-11 (IND2) P Green LED output P3-12 (SIG-) L Mayday switch ground P3-13 (SIG2) W Mayday switch input P3-15 (SIL) R DLC3 line Check telephone ECU assembly. Disconnect the P2 and P3 ECU connectors. Measure the resistance and voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition P2-12 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms P2-1 (+B) - Body ground G - Body ground Vehicle battery power supply Always 11 to 14 V P2-14 (ACC) - Body ground GR - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V P2-13 (IG2) - Body ground B - Body ground IG power supply Engine switch on (IG) 11 to 14 V P2-10 (SPI+) - P2-12 (E) W - W-B Sound signal Audio system playing Waveform synchronized with sound is output P2-11 (SPI-) - P2-12 (E) B - W-B Sound signal Audio system playing Waveform synchronized with sound is output P2-21 (HFOF) - P2-12 (E) B - W-B Phone mute Engine switch on (IG) 3.3 to 5.0 V P2-22 (MUTE) - P2-12 (E) B - W-B Radio mute Engine switch on (IG) 3.3 to 5.0 V P3-2 (BBI+) - P3-9 (BBI-) R - L Non-rechargeable back-up Always 9 to 16 V P3-5 (SIG1) - P3-12 (SIG-) W - L Mayday switch input Engine switch off, all buttons not pushed 4.4 to 5.0 kohms P3-13 (SIG2) - P3-12 (SIG-) W - L Mayday switch input Engine switch off, all buttons not pushed 4.4 to 5.0 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 No. (Symbol) Wiring Color Terminal Description Condition Specified Condition B-1 (SIGNAL) - Body ground B - Body ground Telephone signal input/output Always 4 to 11 kohms If the result is not as specified, there may be a malfunction on the antenna side.
2. CHECK BUS BUFFER ECU Disconnect the P5 ECU connector. Measure the resistance and voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition P5-4 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms P5-3 (+B) - Body ground G - 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 P5 ECU connector. Measure the voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition P5-5 (S1) - P5-4 (GND) B - W-B MPX line Always Pulse generation If the result is not as specified, the ECU may have a malfunction.

Scheme 436

Scheme 437

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. Refer to «DTC CHECK / CLEAR»(ref-385285-S27742832902011021400000) . 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. Refer to «DTC CHECK / CLEAR»(ref-385285-S27742832902011021400000) . If the blinking pattern is the same as in the illustration, a historic DTC is stored. 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 438

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 the 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. Check 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. Clear 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 Item Symptom Cause Check Method Countermeasure Activation Cannot be activated Infrastructure Telephone ECU assembly 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 telephone ECU assembly 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 telephone ECU assembly, 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 Telephone ECU assembly 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 telephone ECU assembly 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 telephone ECU assembly Service Call Emergency Call 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 telephone ECU assembly on vehicle Inform TMS and request setup Service Call Emergency Call Disconnection immediately after connection Infrastructure Telephone antenna (Cellular phone antenna)*2 Telephone ECU assembly 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 telephone ECU assembly 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 telephone ECU assembly Service Call Emergency Call 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 Service Call Emergency Call 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 Telephone ECU assembly 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 telephone ECU assembly 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 Service Call Emergency Call 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 telephone ECU assembly 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, sensors, 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 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 (telephone ECU assembly)/ 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 (telephone ECU assembly)/ YES or NO YES - Battery Voltage Vehicle battery voltage 0 to 25.5 [V] Displays present battery state - #DTC Number of diagnosis trouble codes/ Min.: 0, Max.: 255 0

DIAGNOSTIC TROUBLE CODE CHART

HINT

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

TELEPHONE ECU ASSEMBLY (MAP LIGHT LED BLINKING PATTERN)

BUS BUFFER ECU [MAYDAY GATEWAY] (TESTER DISPLAY)