AUDIO AND VISUAL SYSTEM, Diagnostic DTC:B1321

DTC Code DTC Name
B1321 Lost Communication with EMV

DESCRIPTION

The multi-media module receiver assembly stores this DTC when it cannot receive data from a device that is stored in memory as being connected to the multi-media module receiver assembly.

DTC Code DTC Detection Condition Trouble Area
B1321 The multi-media module receiver assembly cannot receive data from a device that is stored in memory as being connected to the multi-media module receiver assembly.

  • Local bus circuit

  • Multi-media module receiver assembly

  • Remote touch (remote operation board)

  • Accessory meter assembly

WIRING DIAGRAM

A01FU89E18

INSPECTION PROCEDURE

Note


  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips


  • Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK CAN BUS WIRE (CHECK MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT CIRCUIT)


    1. A01FS18E81
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

      Disconnect the cable from the negative (-) auxiliary battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Resistance: Malfunction
      N164-3 (CNH1) - N164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Below 53 Ω: Short in line
      N164-3 (CNH1) - N164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      N164-3 (CNH1) - N164-17 (+B1) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      N164-4 (CNL1) - N164-17 (+B1) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      N164-3 (CNH1) - N164-12 (GND1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: Ground short
      N164-4 (CNL1) - N164-12 (GND1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: Ground short
      Result
      Result Proceed to
      OK A

      NG


      • Open in CAN main bus line

      		 B

      NG


      • Short in line

      • +B short

      • GND short

      		 C

    B

    CHECK FOR OPEN IN CAN BUS WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - REMOTE TOUCH) Click here

    C

    CHECK FOR SHORT IN CAN BUS WIRE (REMOTE TOUCH - MULTI-MEDIA MODULE RECEIVER ASSEMBLY) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01FUCIE90
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)

      Connect the cable to the negative (-) auxiliary battery terminal.

    2. Disconnect the multi-media module receiver assembly connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N164-16 (ACC1) - Body ground Power switch on (ACC) 11 to 14 V
      N164-17 (+B1) - Body ground Power switch off 11 to 14 V

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-12 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  3. CHECK FOR OPEN IN CAN BUS WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - REMOTE TOUCH)


    1. A01FUCIE91
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)

      Disconnect the multi-media module receiver assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-3 (CNH1) - N164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (REMOTE TOUCH - MULTI-MEDIA MODULE RECEIVER ASSEMBLY) Click here

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  4. CHECK FOR OPEN IN CAN BUS WIRE (REMOTE TOUCH - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. A01FQ2KE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Remote Touch [Remote Operation Board])

      Disconnect the remote touch (remote operation board) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N60-5 (MO+) - N60-4 (MO-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (REMOTE TOUCH - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    OK

    REPLACE REMOTE TOUCH (REMOTE OPERATION BOARD) Click here

  5. CHECK FOR SHORT IN CAN BUS WIRE (REMOTE TOUCH - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. A01FQDCE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Remote Touch [Remote Operation Board])
      *b Front view of DLC3

      Disconnect the remote touch (remote operation board) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N60-4 (MO-) - N60-5 (MO+) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      N60-4 (MO-) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N60-5 (MO+) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N60-4 (MO-) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      N60-5 (MO+) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY) Click here

    OK

  6. CHECK FOR SHORT IN CAN BUS WIRE (REMOTE TOUCH - ACCESSORY METER ASSEMBLY)


    1. A01FQDCE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Remote Touch [Remote Operation Board])
      *b Front view of DLC3

      Disconnect the remote touch (remote operation board) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N60-12 (MI-) - N60-13 (MI+) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      N60-12 (MI-) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N60-13 (MI+) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N60-12 (MI-) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      N60-13 (MI+) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRE (ACCESSORY METER ASSEMBLY) Click here

    OK

    REPLACE REMOTE TOUCH (REMOTE OPERATION BOARD) Click here

  7. CHECK FOR SHORT IN CAN BUS WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. A01FR22E27
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)
      *b Front view of DLC3

      Disconnect the multi-media module receiver assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-3 (CNH1) - N164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      N164-3 (CNH1) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N164-4 (CNL1) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N164-3 (CNH1) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      N164-4 (CNL1) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - REMOTE TOUCH)

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  8. CHECK FOR SHORT IN CAN BUS WIRE (ACCESSORY METER ASSEMBLY)


    1. A01FQRZE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Accessory Meter Assembly)
      *b Front view of DLC3

      Disconnect the accessory meter assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N62-15 (WUI) - N62-16 (WUO) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      N62-15 (WUI) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N62-16 (WUO) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      N62-15 (WUI) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      N62-16 (WUO) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (ACCESSORY METER ASSEMBLY - REMOTE TOUCH)

    OK

    REPLACE ACCESSORY METER ASSEMBLY Click here