Inspection Procedure

INSPECT FUSE (RR-IG1-2)

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

Standard resistance

RESISTANCE REFERENCE CHART

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

NG: REPLACE FUSE

OK: Go to Next Step

CHECK REAR JUNCTION BLOCK ECU (SMOK VOLTAGE)

Remove the rear junction block ECU with connectors still connected.
Measure the voltage according to the value(s) in the table below when applying or not applying cigarette smoke.

Standard voltage

VOLTAGE REFERENCE CHART

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
S62-7 (SMOK) - Body ground	Engine switch on (IG) Rear cooler AUTO switch ON No cigarette smoke	Below 1 V

Fig 1: Identifying Rear Junction Block ECU Connector Terminal

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

INSPECT SMOKE SENSOR

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

Standard voltage

VOLTAGE REFERENCE CHART

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

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.

Fig 2: Inspecting Smoke Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SMOKE SENSOR (See DISASSEMBLY )

OK: Go to Next Step

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

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

Standard resistance

RESISTANCE REFERENCE CHART

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 And S28 Rear Air Conditioning Harness Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

REPLACE REAR AIR CONDITIONING HARNESS
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)