AIR CONDITIONING SYSTEM Smoke Sensor Circuit

DESCRIPTION

This sensor detects the smoke level inside the cabin and sends the appropriate signals to the rear junction block ECU.

Tech Tips

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

WIRING DIAGRAM

A01GZBQE04

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (RR-IG1-2)


    1. Remove the RR-IG1-2 fuse from the luggage room junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      RR-IG1-2 fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK REAR JUNCTION BLOCK ECU (SMOK VOLTAGE)

    A01H10QE01

    1. Remove the rear junction block ECU with its connectors still connected.

    2. Measure the voltage according to the value(s) in the table below when applying or not applying cigarette smoke.

      Standard voltage
      Tester Connection Condition Specified Condition
      S62-7 (SMOK) - Body ground

      Power switch ON (IG)

      Rear cooler AUTO switch ON

      Apply cigarette smoke

      		 4.0 V or higher

      Power switch ON (IG)

      Rear cooler AUTO switch ON

      No cigarette smoke

      		 Below 1 V

    NG

    INSPECT SMOKE SENSOR Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  3. INSPECT SMOKE SENSOR

    A01GW5EE02

    1. Remove the smoke sensor Click here.

    2. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 1.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      1 - 2 There is no cigarette smoke Below 1 V
      There is cigarette smoke 4.0 V or higher

      Note

      Since the sensor determines the amount of smoke based on the changes in the amount of light, check the sensor in an area with as little ambient light as possible.


    NG

    REPLACE SMOKE SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - REAR AIR CONDITIONING HARNESS)

    A01GWMWE04

    1. Disconnect the S62 rear junction block ECU connector.

    2. Disconnect the S90 rear air conditioning harness connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      S90-1 (+S) - Body ground Power switch ON (IG) 11 to 14 V

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S90-8 (E) - Body ground Always Below 1 Ω
      S62-7 (SMOK) - S90-6 (S) Always Below 1 Ω
      S62-7 (SMOK) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE REAR AIR CONDITIONING HARNESS


    1. Replace the rear air conditioning harness with a normal one and check that the condition returns to normal Click here.

      OK
      Same problem does not occur.

    NG

    REPLACE REAR JUNCTION BLOCK ECU

    OK

    END (REAR AIR CONDITIONING HARNESS IS DEFECTIVE)