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NAVIGATION SYSTEM Dimmer Signal Circuit

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DTC Code DTC Name
  Dimmer Signal Circuit
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DESCRIPTION

The main body ECU (multiplex network body ECU) sends an auto dimmer signal to the radio receiver assembly via this circuit.

When the radio receiver assembly receives an auto dimmer signal from the main body ECU (multiplex network body ECU), the radio receiver assembly causes the instrument panel illumination to be dimmed.

Table 1. *1 ACAN *2 ADIM *3 Main Body ECU (Multiplex Network Body ECU) *4 Radio Receiver Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

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PROCEDURE


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    INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Disconnect the K58 radio receiver assembly connector.

    2. B003XZ3C18
      *a

      Front view of wire harness connector

      (to Radio Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K58-50 (ADIM) - Body ground

      Power switch on (IG)

      Automatic light control sensor covered by hand, and light control switch in tail or head position

      		 9 V or higher
      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the K2 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the K58 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K2-28 (ACAN) - K58-50 (ADIM) Always Below 1 Ω
      K2-28 (ACAN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR