Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and press the intelligent tester main switch ON.

Select the items below in the ACTIVE TEST and then check that the relay operates.

BODY

ITEM CONDITION CHART

Item	Test Details	Diagnostic Note
TAIL LIGHT	Turn Tail light relay ON/OFF	-

NG: Go to step 2

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

INSPECT FUSE
1. Inspect TAIL fuse and GAUGE No.1 fuse in the instrument panel junction block assembly.
  Resistance:
  
  Below 1 Ω
NG: REPLACE FUSE

OK: Go to Next step

INSPECT RELAY

Inspect TAIL relay continuity.

Remove the TAIL relay from the instrument panel J/B assembly.

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

Fig 1: Inspecting Relay

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Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
3 - 5	Always	10 kΩ or higher
3 - 5	Apply B+ between the terminal 1 and 2	Below 1 Ω

NG: REPLACE RELAY

OK: Go to Next step

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (POWER SOURCE CIRCUIT)

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

Fig 2: Identifying 1A Instrument Panel Junction Block Assembly Front Side Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
1A-1 - Body ground	Always	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

OK: Go to Next step

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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

Fig 3: Identifying 1C And 1D Instrument Panel Junction Block Assembly Front Side Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
1C-4 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
1C-5 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
1D-6 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
1D-14 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
1P-8 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
1O-9 - Body ground	Ignition switch ON	Below 1 V → 10 to 14 V

NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

OK: Go to Next step

INSPECT REAR JUNCTION BLOCK

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

Fig 4: Identifying 5B And 5C Rear Junction Block Assembly Connector Terminals

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
5B-7 - Body ground	Ignition switch OFF → ON	Below 1 V → 10 to 14 V
5C-15 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - REAR JUNCTION BLOCK)

OK: Go to Next step

INSPECT REAR JUNCTION BLOCK

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

Fig 5: Identifying 5C And 5D Rear Junction Block Assembly Connector Terminals

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
5C-16 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
5D-2 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
5D-3 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
5D-12 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
5D-13 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V

NG: REPLACE REAR JUNCTION BLOCK

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR