NAVIGATION SYSTEM, Diagnostic DTC:B157D

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK FOR DTC

   
   

   1. Clear the DTCs Click here.

   2. Check for DTCs Click here.

      OK
      No DTCs are output.

   
   

   OK

   USE SIMULATION METHOD TO CHECK Click here

   NG

2. CHECK OPTIONAL COMPONENTS

   
   

   1. Check if any optional components that may decrease reception capacity, such as sunshade film or a telephone antenna, are installed.

      OK
      Optional components are installed.

      Note

      Do not remove optional components without permission of the customer.

   
   

   OK

   REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)

   NG

3. CHECK ROOF ANTENNA POLE SUB-ASSEMBLY

   
   

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

   
   

   NG

   CHECK AND REPLACE ROOF ANTENNA POLE SUB-ASSEMBLY

   OK

4. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

   
   

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

   2. Turn the ignition switch to ACC with the radio and display receiver assembly connector connected.

   3. Turn on the radio and turn into AM mode.

   4. Place a screwdriver, thin wire or other metal object on the radio and display receiver assembly antenna jack and check that noise can be heard from the speakers.

      OK
      Noise occurs.

   
   

   NG

   REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

   OK

5. CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Amplifier Antenna Assembly)
      *b	Front view of wire harness connector (to Antenna Cord Sub-assembly)

      Disconnect the antenna connector from the amplifier antenna assembly.

   2. Disconnect the antenna connector from the antenna cord sub-assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 - 3 Always Below 1 Ω 1-a - 3-a Always Below 1 Ω 1 - Body ground Always 10 kΩ or higher 1-a - Body ground Always 10 kΩ or higher

   
   

   NG

   REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY Click here

   OK

6. CHECK ANTENNA CORD SUB-ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to No. 2 Antenna Cord Sub-assembly)
      *b	Front view of wire harness connector (to Radio and Display Receiver Assembly)

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

   2. Disconnect the antenna connector from the radio and display receiver 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 3-a - 1-a Always Below 1 Ω 3 - Body ground Always 10 kΩ or higher 3-a - Body ground Always 10 kΩ or higher

   
   

   NG

   REPLACE ANTENNA CORD SUB-ASSEMBLY Click here

   OK

7. CHECK AMPLIFIER ANTENNA ASSEMBLY

   
   

   1. Replace the 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.

   
   

   OK

   END (AMPLIFIER ANTENNA ASSEMBLY IS DEFECTIVE)

   NG

   REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here