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Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check voltage between terminals RMGV of luggage room J/B ECU connector and body ground. 

    PREPARATION: 

    Remove the luggage room J/B ECU with connectors still connected.

    CHECK: 

    1. Turn ignition switch to ON.
    2. Rear A/C switch to ON.
    3. Measure voltage between terminals RMGV of luggage room J/B ECU connector and body ground.

    OK: 

    Voltage: Below 1.0 V 

    Fig 1: Identifying Terminals RMGV Of Luggage Room J/B ECU Connector
    G03376830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Go to step   4 . 
    2. NG : Go to next step. 
  2. Check rear magnetic valve. 

    PREPARATION: 

    Remove the rear magnetic valve (See REAR COOLING UNIT ).

    CHECK: 

    Check the air passage through the valve with and without the battery positive voltage applied between terminals as shown in the chart.

    OK: 

    AIR PASSAGE CONDITION

    Condition Air passage
    Apply B+ between terminals Free passage
    Not apply B+ between terminals No passage
    Fig 2: Checking Rear Magnetic Valve
    G03376831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace rear magnetic valve. 
    2. OK : Go to next step. 
  3. Check harness and connector between luggage room J/B ECU and rear magnetic valve (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Check and replace luggage room J/B ECU. 
  4. Check voltage between terminals RMGV of A/C amplifier connector and body ground. 

    PREPARATION: 

    Remove the A/C amplifier with connectors still connected.

    CHECK: 

    1. Turn ignition switch to ON.
    2. Rear A/C switch to ON.
    3. Measure voltage between terminals RMGV of A/C amplifier connector and body ground.

    OK: 

    Voltage: Below 1.0 V 

    Fig 3: Identifying Terminals RMGV Of A/C Amplifier Connector And Body Ground
    G03376832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Go to step   6 . 
    2. NG : Go to next step. 
  5. Check harness and connector between RMGV of A/C amplifier and rear magnetic valve (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Go to next step. 
  6. Check harness and connector between IG of A/C amplifier and rear magnetic valve (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Check and replace A/C amplifier. 
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