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.

NOTE: When the distance control ECU is replaced with a new one, initialization must be performed (See ADJUSTMENT ).

INSPECT STEERING PAD SWITCH ASSEMBLY

Remove the steering pad switch assembly.

Fig 1: Identifying Distance Control Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Condition	Specified Condition
A-4 (DIST) - A-6 (ECC)	Distance control switch is ON	Below 1Ω
A-4 (DIST) - A-6 (ECC)	Distance control switch is OFF )	10 kΩ or higher

HINT :

When a malfunction is detected in the distance control switch,replace the steering pad switch assembly.

NG: REPLACE STEERING PAD SWITCH ASSEMBLY

OK: Go to Next Step

INSPECT SPIRAL CABLE

NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may cause airbag deployment. read the

HINT:REMOVAL and INSTALLATION information.

Remove the spiral cable.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester connection	Condition	Specified condition
A-4-C13-11	Center	Below 1 Ω
	2.5 rotations to the left	Below 1 Ω
	2.5 rotations to the right	Below 1 Ω
A-6-C13-12	Below 1 Ω
	2.5 rotations to the left	Below 1 Ω
	Center 2.5 rotations to the right	Below 1 Ω

HINT: The spiral cable makes a maximum of approximately 5 rotation.

Fig 2: Inspecting Spiral Cable

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE

OK: Go to Next Step

CHECK WIRE HARNESS (DISTANCE CONTROL ECU- SPIRAL CABLE)

Disconnect the distance control ECU connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Condition	Specified Condition
C13-11 - D2-16 (MODE)	Always	Below 1 Ω
D2-16 (MODE) - Body ground	Always	10 kΩ or higher

Fig 3: Checking Wire Harness (Distance Control ECU - Spiral Cable)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK WIRE HARNESS (SPIRAL CABLE -BODY GROUND)

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Condition	Specified Condition
C13-2 - Body ground	Always	Below 1 Ω

Fig 4: Identifying Terminals Of Connector C13

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT DISTANCE CONTROL ECU

Remove the distance control ECU with the connector.
Turn the ignition switch to the ON position.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Condition	Specified Condition
D2-16(MODE) - Body	Distance control switch ON	0 to 2 V
D2-16(MODE) - Body	Distance control switch ON	9 to 16 V

Fig 5: Identifying Connector D2 Of Distance Control ECU

NG: REPLACE DISTANCE CONTROL ECU

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