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

  • Harness or connector

WIRING DIAGRAM

A01H231E08

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. A01H28HE42
      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
      L164-3 (CNH1) - L164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Below 53 Ω: Short in line
      L164-3 (CNH1) - L164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      L164-3 (CNH1) - L164-17 (+B1) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      L164-4 (CNL1) - L164-17 (+B1) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      L164-3 (CNH1) - L164-12 (GND1) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: Ground short
      L164-4 (CNL1) - L164-12 (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
    C
    A
  2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)


    1. A01GXIOE53
      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 Condition Specified Condition
      L164-17 (+B1) - Body ground Always 11 to 14 V
      L164-16 (ACC1) - Body ground Power switch on (ACC) 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L164-12 (GND1) - Body ground Always Below 1 Ω

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


    1. A01GXIOE54
      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
      L164-3 (CNH1) - L164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

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


    1. A01GZN6E34
      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
      L169-5 (MO+) - L169-4 (MO-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

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


    1. A01GX20E14
      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
      L169-4 (MO-) - L169-5 (MO+) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      L169-4 (MO-) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L169-5 (MO+) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L169-4 (MO-) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      L169-5 (MO+) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

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


    1. A01GX20E15
      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
      L169-12 (MI-) - L169-13 (MI+) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      L169-12 (MI-) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L169-13 (MI+) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L169-12 (MI-) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      L169-13 (MI+) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

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


    1. A01GWSOE18
      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
      L164-3 (CNH1) - L164-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      L164-3 (CNH1) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L164-4 (CNL1) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L164-3 (CNH1) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      L164-4 (CNL1) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

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


    1. A01H1QNE12
      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
      L163-15 (WUI) - L163-16 (WUO) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      L163-15 (WUI) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L163-16 (WUO) - L31-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      L163-15 (WUI) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      L163-16 (WUO) - L31-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

    NG
    OK