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Home/Lexus/LS/Lexus LS IV (2006-2012)/Repair manual/Communication Devices/Other System: Diagnosis
Contents Wiring diagrams Section: Communication Devices All sections

Other System: Diagnosis Lexus LS IV

Communication Devices 12 illustrations ~1091 words

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

Use these procedures to troubleshoot the clock system.

  1. VEHICLE BROUGHT TO WORKSHOP
  2. INSPECT BATTERY VOLTAGE Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding.
  3. BASIC INSPECTION Turn the engine switch on (ACC). Check whether or not the display appears on the multi-display. Result: RESULT CHART Result Proceed to Display appears A Display does not appear B B: Go to «NAVIGATION SYSTEM (FOR DVD)»(ref-349759-S34796669842009120800000) OR «AUDIO AND VISUAL SYSTEM (W/ MULTI-DISPLAY)»(ref-349754-S28142817792009120800000) A: Go to next step
  4. PROBLEM SYMPTOMS TABLE Result: RESULT CHART Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B B: Go to step 6 A: Go to next step
  5. OVERALL ANALYSIS AND TROUBLESHOOTING Terminals of ECU (see «TERMINALS OF ECU»(ref-349755-S31800487152009120800000) ).
  6. ADJUST, REPAIR OR REPLACE NEXT: END

PROBLEM SYMPTOMS TABLE

HINT

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.

Clock system

SymptomSuspected AreaSee
Clock is not displayedClock Power Source CircuitCLOCK POWER SOURCE CIRCUIT
Clock's time is very incorrectClock Loses or Gains TimeCLOCK LOSES OR GAINS TIME
AVC-LAN CircuitAVC-LAN CIRCUIT
Replace clockCLOCK
Clock's nighttime illumination does not operateIllumination CircuitAVC-LAN CIRCUIT
AVC-LAN CircuitAVC-LAN CIRCUIT
Replace clockCLOCK
Replace display and navigation assembly (w/ Navigation System (for HDD))REMOVAL
Replace multi-display (w/ Navigation System (for DVD))REMOVAL
Replace multi-display (w/o Navigation System)REMOVAL

CLOCK SYSTEM PROBLEM SYMPTOMS CHART

Scheme 147

Scheme 147: TERMINALS OF ECU
Scheme 147: TERMINALS OF ECU
  1. CHECK CLOCK Disconnect the L38 clock connector. Measure the resistance and voltage according to the value(s) in the table below. RESISTANCE AND VOLTAGE SPECIFIED CONDITION Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition L38-7 (E) - Body ground B - Body ground Ground Always Below 1 ohms L38-8 (B) - L38-7 (E) R-B Battery Always 11 to 14 V L38-4 (ACC) - L38-7 (E) LG-B ACC power supply Engine switch on (ACC) 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the L38 clock connector. Measure the voltage according to the value(s) in the table below. VOLTAGE SPECIFIED CONDITION Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition L38-3 (ILL-) - L38-7 (E) LG - B Illumination signal Light control switch OFF Below 1 V L38-3 (ILL-) - L38-7 (E) LG - B Illumination signal Light control switch TAIL 11 to 14 V L38-5 (TX-1) - L38-7 (E) R - B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V L38-6 (TX+1) - L38-7 (E) G - B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V If the result is not as specified, the clock may have a malfunction.
  2. CHECK DISPLAY AND NAVIGATION ASSEMBLY (w/ Navigation System (for HDD)) (see «TERMINALS OF ECU»(ref-349759-S33587122672009120800000) )
  3. CHECK MULTI-DISPLAY (w/ Navigation System (for DVD)) (see «TERMINALS OF ECU»(ref-349759-S23904193092009120800000) )
  4. CHECK MULTI-DISPLAY (w/o Navigation System) (see «TERMINALS OF ECU»(ref-349754-S28387031662009120800000) )

Scheme 148

Scheme 148: ADJUSTMENT
Scheme 148: ADJUSTMENT

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Scheme 154
  1. START ADJUSTMENT Press "INFO". Press "Adjust Clock".
  2. SCREEN DESCRIPTION Screen Display DISPLAY REFERENCE CHART Display Contents "Auto Adjust" switch/*1 ON: Performs automatic correction based on GPS information OFF: Does not perform automatic correction "Daylight Saving Time" switch/*2 ON: Daylight savings time is set OFF: Daylight savings time is not set T/Z: Central/*3 Displays current time zone "Time Zone" switch/*4 Changes screen to time zone setting screen "H" switch, "M" switch, ".00" switch/*5 Sets clock "OK" switch Ends "Adjust Clock" mode
  3. ADJUST CLOCK (w7 Navigation System) When planning to use GPS correction, press the "Auto Adjust" "ON" switch. When planning to use daylight saving time, press the "Daylight Saving Time" "ON" switch. Set time zone Press "Time Zone". Select a time zone. Press "Other" to set a customized time zone. HINT: To set a time ahead of GMT, press "up". Each press of "up" sets the time 30 minutes ahead. To set a time behind GMT, press "down". Each press of "down" sets the time 30 minutes behind. After settings are complete, press "OK".
  4. ADJUST CLOCK (w/o Navigation System) HINT: When the navigation system is not available, "Auto Adjust" is "OFF" and cannot be set to "ON". When planning to use daylight saving time, press the "Daylight Saving Time" "ON" switch. To increase the hours, press "H". To increase the minutes, press "M". Press ".00" to set the time to the beginning of an hour. HINT: When performed with the minutes at 0 to 29, the time is set backward, and with the minutes at 30 to 59, the time is set forward. For example, if the time is between 1:00 to 1:29, the time is set to 1:00, and if the time is between 1:30 to 1:59, the time is set to 2:00. After settings are complete, press "OK".

Scheme 155

Scheme 155: INSPECTION PROCEDURE
Scheme 155: INSPECTION PROCEDURE

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Scheme 158
  1. CHECK NAVIGATION SYSTEM Check if the vehicle is equipped with the navigation system. Result: RESULT CHART Result Proceed to w/ Navigation system A w/o Navigation system B B: Go to step 6 A: Go to next step
  2. CHECK AUTO ADJUST Display the "Adjust Clock" screen (see «TERMINALS OF ECU»(ref-349755-S31800487152009120800000) ). Check that "Auto Adjust" is "ON". OK: "Auto Adjust" is "ON". NG: SET "AUTO ADJUST" TO "ON" OK: Go to next step
  3. CHECK DAYLIGHT SAVING TIME Check that "Daylight Saving Time" is set properly. OK: It is set properly. NG SET ITEM PROPERLY OK: Go to next step
  4. CHECK TIME ZONE Check that "Time Zone" is set properly. OK: It is set properly. NG: SET ITEM PROPERLY OK: Go to next step
  5. CHECK NAVIGATION SYSTEM Check that the navigation system is operating normally. OK: Navigation system is normal. Result: RESULT CHART Result Proceed to OK A NG (for HDD) B NG (for DVD) C B: GO TO NAVIGATION SYSTEM (See «NAVIGATION SYSTEM (FOR HDD)»(ref-349759-S11151171832009120800000) ) C: GO TO NAVIGATION SYSTEM (See «NAVIGATION SYSTEM (FOR DVD)»(ref-349759-S34796669842009120800000) ) A: PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-349755-S14027750602009120800000) )
  6. CHECK DAYLIGHT SAVING TIME Display the "Adjust Clock" screen (see «TERMINALS OF ECU»(ref-349755-S31800487152009120800000) ). Check that "Daylight Saving Time" is set properly. OK: It is set properly. NG: SET ITEM PROPERLY OK: Go to next step
  7. INSPECT ERROR MARGIN OF CLOCK Inspect the error margin of the clock. OK: Allowable error (per day) is +/-1.0 seconds. NG: Go to step 8 OK: END
  8. INSPECT AUDIO AND VISUAL SYSTEM Check that the audio and visual system is operating normally. OK: Audio and visual system is normal. NG: GO TO AUDIO AND VISUAL SYSTEM (w/ Multi-display) (See «AUDIO AND VISUAL SYSTEM (W/ MULTI-DISPLAY)»(ref-349754-S28142817792009120800000) ) OK: PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-349755-S14027750602009120800000) )

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