SUB BATTERY SYSTEM ECU Power Source Circuit

DESCRIPTION

Power is supplied to the B terminal of the sub-battery module assembly from the auxiliary battery power source.

The B terminal supplies power to the sub-battery ECU, which uses it for sub-battery charging and discharging control, condition judgment, DTC output and freeze frame data output.

When the LUG-IG1 NO. 1 relay is turned on while the power switch is on (IG), power is supplied to the IG terminal of the sub-battery module.

WIRING DIAGRAM

B004XTME05

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT SUB-BATTERY MODULE ASSEMBLY (B TERMINAL VOLTAGE)


    1. B004YNKC18
      *a

      Front view of wire harness connector

      (to Sub-battery Module Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P6-7 (B) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - SUB-BATTERY MODULE ASSEMBLY)

    OK

  2. INSPECT SUB-BATTERY MODULE ASSEMBLY (IG TERMINAL VOLTAGE)


    1. Disconnect the sub-battery module assembly connector.

    2. Turn the power switch on (IG).

    3. B004YNKC19
      *a

      Rear view of wire harness connector

      (to Sub-battery Module Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P6-14 (IG) - Body ground Power switch on (IG) 11 to 14 V

    4. Reconnect the sub-battery module assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (LUG-IG NO. 1 RELAY - SUB-BATTERY MODULE ASSEMBLY)


    1. Remove the LUG-IG NO. 1 relay from the No. 2 luggage room relay block.

    2. Disconnect the sub-battery module assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LUG-IG NO. 1 relay terminal 5 - P6-14 (IG) Always Below 1 Ω
      LUG-IG NO. 1 relay terminal 5 or P6-14 (IG) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO ENTRY AND START SYSTEM (FOR START FUNCTION) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR