COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DESCRIPTION

The ECU receives engine operation signals from the ALTL terminal of the power management control ECU. If this circuit is open, the ECU will determine that the engine operation signals indicate that the engine is running. If this circuit is shorted, the ECU will determine that the engine operation signals indicate that the engine is stopped, and the heater assembly will not operate.

WIRING DIAGRAM

A004N8EE02

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - POWER MANAGEMENT CONTROL ECU)


    1. w/o Entry and Start System


      1. Disconnect the A54 heater assembly connector.

        A004SUPE01

      2. Disconnect the D104 power management control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A54-8 (+) - D104-10 (ALTL) Always Below 1 Ω
        A54-8 (+) - Body ground Always 10 kΩ or higher

    2. w/ Entry and Start System


      1. A004PJXE02
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Heater Assembly)
        *2

        Front view of wire harness connector

        (to Power Management Control ECU)

        Disconnect the A54 heater assembly connector.

      2. Disconnect the D111 power management control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A54-8 (+) - D111-7 (ALTL) Always Below 1 Ω
        A54-8 (+) - Body ground Always 10 kΩ or higher

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR