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Home >> Lexus >> 2020 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Audio And Visual System (8 Inch Display) (Diagnostic Codes) (1 Of 2) >> AUDIO AND VISUAL SYSTEM (for 8 Inch Display) >> DTC B1324: Lost Communication with Meter; DTC B1325: Lost Communication with HUD [12/2017 - 08/2019] >> Procedure

DTC B1324: Lost Communication with Meter; DTC B1325: Lost Communication with HUD [12/2017 - 08/2019]: Procedure

  1. CHECK DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2017 - 08/2019]

      Body Electrical > Navigation System > Clear DTCs 

    2. Recheck for DTCs and check that no DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

      Result

      Result Proceed to
      All DTCs are not output A
      All DTCs are output B
      DTC B1324 is output C
      DTC B1325 is output (w/ Headup Display (Meter Mirror Sub-assembly)) D

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 03/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2018 - 08/2019] 

    Result: 

    C 

    See step  11

    Result: 

    D 

    See step  13

    Result: 

    B 

    See step  2

  2. CHECK LOCAL BUS 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J93-6 - J93-16 Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Result

      Result Proceed to
      OK A
      NG (Below 54 Ω) B
      NG (70 Ω or higher) C

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 03/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2018 - 08/2019] 

    Result: 

    C 

    See step  9

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J93 No. 2 CAN junction connector.
    3. Connect the J55 radio receiver assembly connector.
    4. Measure the resistance according to the value (s) in the table below.
      GTY662502Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      J93-6 - J93-16 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J93 No. 2 CAN junction connector.
    3. Connect the J11 combination meter assembly connector.
    4. Measure the resistance according to the value (s) in the table below.
      GTY662502Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      J93-2 - J93-12 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Result Proceed to
      OK (w/o Headup Display (Meter Mirror Sub-assembly)) A
      OK (w/ Headup Display (Meter Mirror Sub-assembly)) B
      NG C

    Result: 

    A 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  7

    Result: 

    B 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY) - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J93 No. 2 CAN junction connector.
    3. Connect the K1 headup display (meter mirror sub-assembly) connector.
    4. Measure the resistance according to the value (s) in the table below.
      GTY662502Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      J93-1 - J93-11 Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY) - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the K1 headup display (meter mirror sub-assembly) connector.
    3. Connect the J93 No. 2 CAN junction connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K1-7 (TX+) - K1-8 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY). Refer to  REMOVAL [08/2016 - 08/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J11 combination meter assembly connector.
    3. Connect the J93 No. 2 CAN junction connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J11-10 (TX+) - J11-9 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2016 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J55 radio receiver assembly connector.
    3. Connect the J93 No. 2 CAN junction connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J55-3 (CNH1) - J55-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2017 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J55 radio receiver assembly connector.
    3. Connect the J93 No. 2 CAN junction connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J55-3 (CNH1) - J55-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2017 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019] 

    Result: 

    NG 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J93 No. 2 CAN junction connector.
    3. Connect the J55 radio receiver assembly connector.
    4. Measure the resistance according to the value (s) in the table below.
      GTY662502Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      J93-6 - J93-16 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY POWER SOURCE) 
    1. Disconnect the J10 combination meter assembly connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J10-31 (ES) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      J10-22 (B) - Body ground Power switch off 11 to 14 V
      J10-21 (IG+) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the J11 combination meter assembly connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J11-10 (TX+) - J11-9 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2016 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY) POWER SOURCE) 
    1. Disconnect the K1 headup display (meter mirror sub-assembly) connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K1-6 (ES) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      K1-1 (B) - Body ground Power switch off 11 to 14 V
      K1-2 (IG) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY) - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the K1 headup display (meter mirror sub-assembly) connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K1-7 (TX+) - K1-8 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY). Refer to  REMOVAL [08/2016 - 08/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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