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Home >> Lexus >> 2014 >> IS 250 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes (1 Of 2) >> Meter / Gauge System >> DTC B1321: Lost Communication with EMV; DTC B1326: Lost Communication with Clock Device (Local-CAN) [09/2020 - ] >> Procedure

DTC B1321: Lost Communication with EMV; DTC B1326: Lost Communication with Clock Device (Local-CAN) [09/2020 - ]: Procedure

  1. CHECK FOR DTC (EACH SYSTEM) 
    1. Check each system for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Body Electrical > Navigation System > Trouble Codes 

    2. Confirm the DTC combinations of the following table.
      DTC Output Pattern DTC Output Part Name
      (Display on Techstream)
      Combination Meter Assembly
      (Combination Meter)      		 Radio Receiver Assembly
      (Navigation System)
      1 B1321
      B1326      		 B1323
      B1324
      B1326
      2 B1321
      B1326      		 B1324
      3 B1321
      B1326      		 Not output
      4 B1321 B1323
      B1324
      B1326
      5 B1321 Not output
      6 B1326 B1326
      7 B1326 Not output

      Result

      Result Proceed to
      DTC output pattern 1 A
      DTC output pattern 2 B
      DTC output pattern 4 C
      DTC output pattern 5 D
      DTC output pattern 6 E
      DTC output pattern 3 or 7 F

    Result: 

    B 

    See step  3

    Result: 

    C 

    See step  4

    Result: 

    D 

    See step  5

    Result: 

    E 

    See step  6

    Result: 

    F 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    A 

    See step  2

  2. INSPECT EACH ECU (INTERNAL MALFUNCTION) 
    1. Remove 1 of the following ECUs.
    2. Measure the resistance of the removed ECU.
      NOTE:
      • Refer to the following table for the specified conditions of each ECU.
      • If the specified conditions are met, repeat the inspection procedure from step (a) for another ECU.

      HINT: 

      If the results of an ECU are not as specified, it is suspected that the ECU is the cause of the DTC.

      1. Inspect the radio receiver assembly.
        GTY971903Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Radio Receiver Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        K173-5 (CNH1) -K173-6 (CNL1) Always 108 to 132 Ω
      2. Inspect the clock assembly.
        GTY970577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Clock Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        K167-5 (TX+1) -K167-6 (TX-1) Always 200 Ω or higher
      3. Inspect the remote operation controller assembly.
        GTY971575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Remote Operation Controller Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        K180-9 (MO+) -K180-8 (MO-) Always 108 to 132 Ω
      4. Inspect the combination meter assembly.
        GTY970779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Combination Meter Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        K4-10 (MSCH) -K4-9 (MSCL) Always 200 Ω or higher

      Result

      Result  Proceed to
      The results of all ECUs are as specified A
      The results of the radio receiver assembly are not as specified B
      The results of the clock assembly are not as specified C
      The results of the remote operation controller assembly are not as specified D
      The results of the combination meter assembly are not as specified E

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    C 

    REPLACE CLOCK ASSEMBLY. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    D 

    REPLACE REMOTE OPERATION CONTROLLER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    E 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

  3. CHECK HARNESS AND CONNECTOR (LOCAL BUS COMMUNICATION CIRCUIT) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the K4 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K4-10 (MSCH) - K4-9 (MSCL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (LOCAL BUS COMMUNICATION CIRCUIT) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the K173 radio receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K173-5 (CNH1) - K173-6 (CNL1) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK FOR DTC (METER / GAUGE SYSTEM) 
    1. Disconnect the cable from the negative (-) battery terminal.

      HINT: 

      By disconnecting the cable from the negative (-) battery terminal, the internally stored information related to local bus communication for the combination meter assembly is reset.

    2. Disconnect the K173 radio receiver assembly connector.
    3. Connect the cable to the negative (-) battery terminal.
    4. Turn the engine switch on (IG).
    5. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

    6. Wait 30 seconds or more.
    7. Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      HINT: 

      By resetting the internally stored information related to local bus communication, the detection conditions of DTC B1321 are not met as the combination meter assembly does not detect the radio receiver assembly. If the combination meter assembly is operating normally, DTC B1321 will not be stored.

      Result:

      Result  Proceed to
      DTC B1321 is not output A
      DTC B1321 is output B

    Result: 

    A 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2020 - ] 

  6. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the K167 clock assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      K167-1 (B) - Body ground Always 11 to 14 V
      K167-2 (ACC) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
      GTY970521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Clock Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K167-7 (E) - Body ground Below 1 Ω 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (LOCAL BUS COMMUNICATION CIRCUIT) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K167-5 (TX+1) - K167-6 (TX-1) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CLOCK ASSEMBLY. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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