Inspection Procedure

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

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

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

NG: REPLACE FUSE 

OK: Go to next step. 

1. Remove the rear junction block ECU with 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 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   S62-7 (SMOK) - Body ground	Engine switch on (IG) Rear cooler AUTO switch ON Apply cigarette smoke	Above 4.0 V
   	Engine switch on (IG) Rear cooler AUTO switch ON No cigarette smoke	Below 1 V

   Fig 1: Identifying Rear Junction Block ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

NG: Go to next step. 

1. Remove the smoke sensor (see DISASSEMBLY  ).
2. Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 3.
3. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   2 - 3	There is no cigarette smoke	Below 1.0 V
   	There is cigarette smoke	Above 4.0 V

   Fig 2: Inspecting Smoke Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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  (See DISASSEMBLY  )

OK: Go to next step. 

1. Disconnect the S62 rear junction block ECU connector.
2. Disconnect the S28 rear air conditioning harness connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   S62-7 (SMOK) - S28-13 (S)	Always	Below 1 Ω
   S62-7 (SMOK) - Body ground	Always	10 kΩ or higher

   Fig 3: Identifying S62 Rear Junction Block ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

HINT:

Replace the rear air conditioning harness with a normal one and check that the condition returns to normal (see DISASSEMBLY  ).

OK: Same problem does not occur. 

NG: REPLACE REAR JUNCTION BLOCK ECU 

OK: END (REAR AIR CONDITIONING HARNESS IS FAULTY)