METER / GAUGE SYSTEM Entire Combination Meter does not Operate

DESCRIPTION

This circuit is the power source circuit for the No. 1 meter ECU. This circuit provides 2 power source types: one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission. The constant power source is mainly used as a backup power source of the meter CPU, however, it is also used for communication. If a voltage of 12 V is not applied to terminal IG2 when the power switch is on (IG), the indicator will not operate.

WIRING DIAGRAM

A000XH0E13
*1 from Auxiliary Battery
*2 from IG2 Relay
*3 No. 1 Meter ECU

PROCEDURE


  1. INSPECT FUSE (D MPX-B 2, P-J/B)


    1. Remove the D MPX-B 2 fuse from the main body ECU.

    2. Remove the P-J/B fuse from the engine room No. 2 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D MPX-B 2 fuse Always Below 1 Ω
      P-J/B fuse

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY AND BODY GROUND)


    1. A000XNME02
      *1 Rear view of harness connector: (to No. 1 Meter ECU)

      Disconnect the L124 meter connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L124-17 (E2) - Body ground Always Below 1 Ω
      L124-18 (ES) - Body ground
      Standard voltage
      Tester Connection Condition Specified Condition
      L124-14 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      L124-13 (B) - Body ground Always

    OK

    REPLACE NO. 1 METER ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR