Inspection Procedure

WARNING: This page is about a different car, the 2007 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 DISTANCE CONTROL ECU

Turn the ignition switch on.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Condition	Specified Condition
D2-16 (MODE) - D2-12 (GND)	Distance control switch ON (pushed)	0 to 2V
D2-16 (MODE) - D2-12 (GND)	Distance control switch OFF (not pushed)	10 to 14 V

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

Fig 1: Identifying D2 GND & MODE Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to Next Step

INSPECT DISTANCE CONTROL SWITCH CIRCUIT

Disconnect the D2 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
D2-16 (MODE) - Body ground	Distance control switch ON (pushed)	Below 1 Ω
D2-16 (MODE) - Body ground	Distance control switch OFF (not pushed)	10 kΩ or higher

Fig 2: Identifying D2 MODE Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - SPIRAL CABLE)

NG: Go to Next Step

INSPECT STEERING PAD SWITCH ASSEMBLY

Remove the steering pad (See REMOVAL ).

Fig 3: Identifying Distance Control Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the K1 connector from 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
K1-4 (DIST) - K1-6 (ECC)	Distance control switch ON (pushed)	Below 1 Ω
K1-4 (DIST) - K1-6 (ECC)	Distance control switch OFF (not pushed)	10 kΩ or higher

OK: Go to step 6

NG: Go to Next Step

INSPECT STEERING PAD SWITCH CABLE

Remove the steering pad switch cable.

Fig 4: Identifying Steering Pad Switch Cable
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
B-1 (DIST) - C-1 (DIST)	Always	Below 1 Ω
B-7 (ECC) - C-7 (ECC)	Always	Below 1 Ω

NG: REPLACE STEERING PAD SWITCH CABLE

OK: Go to Next Step

INSPECT STEERING PAD SWITCH RH

Connect the steering pad switch cable to the steering pad switch RH.

Fig 5: 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
B-1 (DIST) - B-7 (ECC)	Distance control switch ON	Below 1 Ω
B-1 (DIST) - C-7 (ECC)	Distance control switch OFF	10 kΩ or higher

NG: REPLACE STEERING PAD SWITCH

OK: REPLACE STEERING PAD SWITCH LH

CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - SPIRAL CABLE)

NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the page shown in the brackets.

HINT:

See REMOVAL
See INSTALLATION

Remove the spiral cable.
Disconnect the D2 connector from the distance control ECU.

Fig 6: Identifying D2 & C13 Connectors Terminals
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
C13-11 (DIST) - D2-16 (MODE)	Always	Below 1 Ω
C13-11 (DIST) - Body ground	Distance control switch OFF	10 kΩ or higher
C13-11 (DIST) - Body ground	Distance control switch ON	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE SPIRAL CABLE