LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2025 >> Land Cruiser Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes, Symptom Tests & Circuit Tests >> Meter / Gauge System >> Speed Signal Circuit [02/2024 - ] >> Procedure

Speed Signal Circuit [02/2024 - ]: Procedure

  1. CHECK DTC (SMART KEY SYSTEM) 
    1. Check if smart key system DTCs are output.

      Body Electrical > Power Source Control > Trouble Codes 

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    GO TO SMART KEY SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2024 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the E8*1 or E4*2 combination meter assembly connector.
      1. *1: for 7 Inch Multi-information Display Type
      2. *2: for 12.3 Inch Multi-information Display Type
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Switch Condition Specified Condition
      E8-35 (+S) - Body ground Ignition switch ON 11 to 14 V
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Switch Condition Specified Condition
      E4-8 (+S) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      If any of the ECUs specified in the wiring diagram supplies power to the combination meter assembly, the combination meter assembly will output a waveform.

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 

    HINT: 

    This procedure is performed to check the diode inside the combination meter assembly.

    1. Remove the combination meter assembly.

      Refer to REMOVAL [02/2024 - ]

    2. Measure the internal resistance of the combination meter assembly.

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Tester Connection Condition Specified Condition
      E7-6 (IG+) - E8-18 (SI)
      • Positive (+) tester probe → E7-6 (IG+)
      • Negative (-) tester probe → E8-18 (SI)
      		 Always A
      E7-6 (IG+) - E8-18 (SI)
      • Positive (+) tester probe → E8-18 (SI)
      • Negative (-) tester probe → E7-6 (IG+)
      		 Always B
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Tester Connection Condition Specified Condition
      E4-6 (IG+) - E4-25 (SI)
      • Positive (+) tester probe → E4-6 (IG+)
      • Negative (-) tester probe → E4-25 (SI)
      		 Always A
      E4-6 (IG+) - E4-25 (SI)
      • Positive (+) tester probe → E4-25 (SI)
      • Negative (-) tester probe → E4-6 (IG+)
      		 Always B

      OK

      There is a large difference between the measured value (A) and the measured value (B).

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [02/2024 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 
    1. *1: for 7 Inch Multi-information Display Type
    2. *2: for 12.3 Inch Multi-information Display Type
    1. Disconnect the E8*1 or E4*2 combination meter assembly connector.
    2. Disconnect the E89 certification ECU (smart key ECU assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E8-18 (SI) - E89-28 (SPDO) Always Below 1 Ω
      E8-18 (SI) or E89-28 (SPDO) - Body ground Always 10 kΩ or higher
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E4-25 (SI) - E89-28 (SPDO) Always Below 1 Ω
      E4-25 (SI) or E89-28 (SPDO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [02/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. *1: for 7 Inch Multi-information Display Type
    2. *2: for 12.3 Inch Multi-information Display Type
    3. *3: except 6 Speakers
    1. Disconnect the E8*1 or E4*2 combination meter assembly connector.
    2. Disconnect the L9 stereo component amplifier assembly connector.*3
    3. Disconnect the E16 radio and display receiver assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E8-35 (+S) - L9-11 (SPD)*3 Always Below 1 Ω
      E8-35 (+S) - E16-8 (SPD) Always Below 1 Ω
      E8-35 (+S) or L9-11 (SPD)*3 or E16-8 (SPD) - Body ground Always 10 kΩ or higher
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E4-8 (+S) - L9-11 (SPD)*3 Always Below 1 Ω
      E4-8 (+S) - E16-8 (SPD) Always Below 1 Ω
      E4-8 (+S) or L9-11 (SPD)*3 or E16-8 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      except 6 Speakers A
      for 6 Speakers B

    Result: 

    B 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [02/2024 - ] 

    Result: 

    A 

    See step  7

  7. CHECK FOR STEREO COMPONENT AMPLIFIER ASSEMBLY 
    1. Disconnect the E8*1 or E4*2 combination meter assembly connector.
      1. *1: for 7 Inch Multi-information Display Type
      2. *2: for 12.3 Inch Multi-information Display Type
    2. Disconnect the L9 stereo component amplifier assembly connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Switch Condition Specified Condition
      E8-35 (+S) - Body ground Ignition switch ON 4.5 to 14 V
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Switch Condition Specified Condition
      E4-8 (+S) - Body ground Ignition switch ON 4.5 to 14 V

      HINT: 

      If the result is as specified, there may be a short circuit in the stereo component amplifier assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [02/2024 - ] 

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [02/2024 - ] 

scientia non olet · About LEMON Manuals