AUDIO AND VISUAL SYSTEM(for Radio and Display Type), Diagnostic DTC:B157D

DTC Code DTC Name
B157D DAB Tuner Antenna Disconnected

DESCRIPTION

This DTC is stored when a malfunction occurs in the digital audio broadcasting antenna cable which is connected to the radio and display receiver assembly.

DTC Code

DTC Detection Condition

Trouble Area

B157D

The digital audio broadcasting cable is not connected.

  • Antenna cord sub-assembly

  • No. 2 antenna cord sub-assembly

  • Roof antenna pole sub-assembly

  • No. 1 amplifier antenna assembly

  • Radio and display receiver assembly

WIRING DIAGRAM

E291132E26

CAUTION / NOTICE / HINT

Note:

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections (Click here).

PROCEDURE

  1. CHECK CONNECTION OF DAB RADIO ANTENNA CABLE

    1. Check if the DAB radio antenna cable is securely connected to the radio and display receiver assembly.

      OK

      DAB radio antenna cable is securely connected

    SECURELY CONNECT DAB RADIO ANTENNA CABLE

  2. CHECK ANTENNA CORD SUB-ASSEMBLY

    1. U124106E02

      Remove the antenna connector from the radio and display receiver assembly.

    2. Remove the antenna connector from the No. 2 antenna cord sub-assembly.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      DB-1 - 3

      Always

      Below 1 Ω

      DB-1a - 3a

      Always

      Below 1 Ω

      DB-1 - Body ground

      Always

      10 kΩ or higher

      DB-1a - Body ground

      Always

      10 kΩ or higher
      Table 1. Text in Illustration

      *a

      Front view of wire harness connector

      (to Radio and Display Receiver Assembly)

      *b

      Front view of wire harness connector

      (to No. 2 Antenna Cord Sub-assembly)

    REPLACE ANTENNA CORD SUB-ASSEMBLY

  3. CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY

    1. E291235E01

      Remove the antenna connector from the antenna cord sub-assembly.

    2. Remove the antenna connector from the No. 1 amplifier antenna assembly.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 1

      Always

      Below 1 Ω

      3a - 1a

      Always

      Below 1 Ω

      3 - Body ground

      Always

      10 kΩ or higher

      3a - Body ground

      Always

      10 kΩ or higher
      Table 2. Text in Illustration

      *a

      Front view of wire harness connector

      (to Antenna Cord Sub-assembly)

      *b

      Front view of wire harness connector

      (to No. 1 Amplifier Antenna Assembly)

    REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY

    (Click here)

  4. CHECK ROOF ANTENNA POLE SUB-ASSEMBLY

    1. Check that the roof antenna pole sub-assembly is securely installed.

      OK

      The roof antenna pole sub-assembly is installed properly

    REINSTALL ROOF ANTENNA POLE SUB-ASSEMBLY

  5. CHECK ROOF ANTENNA POLE SUB-ASSEMBLY

    1. Replace the roof antenna pole sub-assembly with a known good one.

    2. Clear the DTCs (Click here).

    3. Check for DTCs (Click here).

      OK

      No DTCs are output.

    END (ROOF ANTENNA POLE SUB-ASSEMBLY IS DEFECTIVE)

  6. CHECK NO. 1 AMPLIFIER ANTENNA ASSEMBLY

    1. Replace the No. 1 amplifier antenna assembly with a known good one (Click here).

    2. Clear the DTCs (Click here).

    3. Check for DTCs (Click here).

      OK

      No DTCs are output.

    END (NO. 1 AMPLIFIER ANTENNA ASSEMBLY IS DEFECTIVE)

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)