METER / GAUGE SYSTEM, Diagnostic DTC:B1504

DTC Code DTC Name
B1504 Lost Communication with Steering SW

DESCRIPTION

The combination meter assembly communicates with the steering pad switch via a direct line. If the combination meter assembly detects a communication malfunction, it stores this DTC.

DTC No. DTC Detection Condition Trouble Area
B1504

When the IG voltage is 9.5 V or more and power switch on (IG) and the following condition is detected:


  1. Steering pad switch communication error has been detected for more than 3 seconds.

  • Wire harness or connector

  • Spiral cable with sensor sub-assembly

  • Steering pad switch RH

  • Steering pad switch LH

  • Combination meter assembly (No. 3 meter circuit plate)

WIRING DIAGRAM

A004138E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING GTS (MULTI DISPLAY SELECT SWITCH, DRIVE MONITOR RESET SW)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Check the values by referring to the table below.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Multi Display Select Switch DISP switch in the steering pad switch RH/OFF or ON OFF: DISP switch in the steering pad switch RH not pressed -
      ON: DISP switch in the steering pad switch RH pressed -
      Drive Monitor Reset SW TRIP switch in the steering pad switch RH/OFF or ON OFF: TRIP switch in the steering pad switch RH not pressed -
      ON: TRIP switch in the steering pad switch RH pressed more than 1 second -
      OK
      Steering pad switch RH condition displayed on the GTS changes with the actual switch operation.

    NG

    INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here

    OK

    REPLACE NO. 3 METER CIRCUIT PLATE Click here

  2. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


    1. A0042YXE18
      Text in Illustration
      *a

      Component without harness connected

      (Spiral Cable with Sensor Sub-assembly)

      Disconnect the L43 and z9 spiral cable with sensor sub-assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L43-3 (TX1) - z9-7 Always Below 1 Ω
      L43-9 (IG) - z9-2 Always Below 1 Ω

    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - IG2 RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L43-9 (IG) - Body ground Power switch off Below 1 V
      L43-9 (IG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - STEERING PAD SWITCH RH)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L23-29 (STRG) - L43-3 (TX1) Always Below 1 Ω
      L23-29 (STRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE STEERING PAD SWITCH RH


    1. Replace the steering pad switch RH with a new or known good one Click here.

      OK
      The operation of the combination meter assembly returns to normal.

    NG

    REPLACE STEERING PAD SWITCH LH Click here

    OK

    END

  6. REPLACE STEERING PAD SWITCH LH


    1. Replace the steering pad switch LH with a new or known good one Click here.

      OK
      The operation of the combination meter assembly returns to normal.

    NG

    REPLACE NO. 3 METER CIRCUIT PLATE Click here

    OK

    END