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Problem Symptoms Table

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Be sure to check that there is no trouble in infrastructure before performing the troubleshooting.

PROBLEM SYMPTOMS

Symptom Suspect Area See Section
The guidance voice of "System Message" does not come out when ignition switch is turned ON.
  1. Speaker assy Rear (LH)
  2. Wire harness
  3. Telephone ECU (Mayday ECU)
 THE GUIDANCE VOICE OF "SYSTEM MESSAGE" DOES NOT COME OUT WHEN IGNITION SWITCH IS TURNED ON, THE GUIDANCE VOICE OF "SYSTEM MESSAGE" INTERMITTENTLY STOP WHEN IGNITION SWITCH IS TURNED ON, THE GUIDANCE VOICE OF "SYSTEM MESSAGE" BEGINS IN THE MIDDLE WHEN IGNITION SWITCH IS TURNED ON 
The guidance voice of "System Message" intermittently stop/begins in the middle. Telephone ECU (Mayday ECU) THE GUIDANCE VOICE OF "SYSTEM MESSAGE" DOES NOT COME OUT WHEN IGNITION SWITCH IS TURNED ON, THE GUIDANCE VOICE OF "SYSTEM MESSAGE" INTERMITTENTLY STOP WHEN IGNITION SWITCH IS TURNED ON, THE GUIDANCE VOICE OF "SYSTEM MESSAGE" BEGINS IN THE MIDDLE WHEN IGNITION SWITCH IS TURNED ON 
The guidance voice does not come out during "Memo Call" function operates.
  1. Speaker assy Rear (LH)
  2. Wire Harness
  3. Telephone ECU (Mayday ECU)
 THE GUIDANCE VOICE OF "SYSTEM MESSAGE" DOES NOT COME OUT WHEN IGNITION SWITCH IS TURNED ON, THE GUIDANCE VOICE OF "SYSTEM MESSAGE" INTERMITTENTLY STOP WHEN IGNITION SWITCH IS TURNED ON, THE GUIDANCE VOICE OF "SYSTEM MESSAGE" BEGINS IN THE MIDDLE WHEN IGNITION SWITCH IS TURNED ON 
When playing the recorded memos, the voice does not come out.
  1. Overhead J/B (Microphone)
  2. Overhead J/B (Mayday switch)
  3. Wire harness
  4. Telephone ECU (Mayday ECU)
 MALFUNCTION IN "MEMO CALL" FUNCTION. 
When playing the recorded memos it finishes in the middle. Telephone ECU (Mayday ECU) IN-34
When playing the recorded memos, the playing time is too long.
  1. Overhead J/B (Mayday switch)
  2. Telephone ECU (Mayday ECU)
 MALFUNCTION IN "MEMO CALL" FUNCTION. 
When playing the recorded memos, the volume cannot be adjusted.
  1. Overhead J/B (Mayday switch)
  2. Wire harness
  3. Telephone ECU (Mayday ECU)
 MALFUNCTION IN "MEMO CALL" FUNCTION. 
The guidance voice of "Demo Memo" does not come out.
  1. Overhead J/B (Mayday switch)
  2. Wire harness
  3. Telephone ECU (Mayday ECU)
 THE GUIDANCE VOICE OF "DEMO MEMO" DOES NOT COME OUT. 
The guidance voice does not sound during "Service Call" function. Telephone ECU (Mayday ECU) IN-34
When "Service Button" is working, the voice cannot reach to LEXUS Link Center, connection is cut off immediately after the voice reaches.
  1. Service area
  2. Telephone transceiver assy
  3. Antenna
  4. Wire harness
 WHEN "SERVICE BUTTON" IS WORKING THE CONNECTION TO LEXUS LINK CENTER CANNOT BE MADE OR IS IMMEDIATELY CUT OFF. 
While service call is working, the voice cannot reach to LEXUS Link Center.
  1. Overhead J/B (Microphone)
  2. Wire harness
  3. Telephone ECU (Mayday ECU)
  4. Telephone transceiver assy
 WHILE SERVICE CALL IS WORKING, VOICE CANNOT REACH TO LEXUS LINK CENTER. 
After the connection to LEXUS Link Center, no voice comes out.
  1. Telephone transceiver assy
  2. Wire harness
 AFTER THE CONNECTION TO LEXUS LINK CENTER, NO VOICE COMES OUT. 
The connection cannot be cut off.
  1. Overhead J/B (Microphone)
  2. Telephone ECU (Mayday ECU)
 THE CONNECTION TO LEXUS LINK CENTER CANNOT BE CUT OFF. 
The line condition with LEXUS Link Center is not good.
  1. Overhead J/B (Microphone)
  2. Rear LH speaker
  3. Telephone ECU (Mayday ECU)
  4. Telephone transceiver assy
 THE LINE CONDITION WITH LEXUS LINK CENTER IS NOT GOOD. 
After the connection to LEXUS Link Center the data cannot be reached to LEXUS Link Center.
  1. Wire harness
  2. Telephone ECU (Mayday ECU)
 THE LINE CONDITION WITH LEXUS LINK CENTER IS NOT GOOD. 
GPS receiver error. GPS antenna or Telephone ECU (Mayday ECU) (1) -
The uncontrolled "Service Call" is sent.
  1. Theft deterrent ECU
  2. Airbag sensor assembly
  3. Multiplex communication system
  4. Portablephone-L battery
 THE UNCONTROLLED SERVICE IS SENT., THE UNCONTROLLED EMERGENCY CALL IS SENT. 
The uncontrolled "Emergency Call" is sent.
  1. Theft deterrent ECU
  2. Airbag sensor assembly
 THE UNCONTROLLED SERVICE IS SENT., THE UNCONTROLLED EMERGENCY CALL IS SENT. 
The buck-up battery life is short.
  1. Telephone ECU (Mayday ECU)
  2. Portablephone-L battery
 BUCK-UP BATTERY LIFE IS SHORT. 
(1) Check GPS receive condition.

HINT:

  1. Park the vehicle at the open sky area at least 50 meter away from any buildings.
  2. More than 2 minutes after the ignition switch ON, call to LEXUS Link Center, and confirm the vehicle's location is correct.
    • If location is confirmed correctly, turn the ignition key OFF and wait 30 minutes, and do (2) again.

      If location is confirmed, go back to ones.

    • If location is not confirmed, with the engine keep ON, place a call to LEXUS Link Center at least 5 times every 2 minutes.

      If location is not confirmed, turn the ignition key OFF and wait 1 hour, and go back to again.

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