Inspection Procedure

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

INSPECT STEERING PAD SWITCH ASSEMBLY

Remove the steering pad switch assembly (See REMOVAL ).

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

RESISTANCE REFERENCE

Tester Connection	Switch Condition	Specified Condition
z12-4(DIST)-z12-6(ECC)	Distance control switch is ON	Below 1 Ω
z12-4(DIST)-z12-6(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 (See REMOVAL )

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. Be sure to read the page shown in the brackets.

HINT:

Removal (See REMOVAL )
Installation (See INSTALLATION )

Remove the spiral cable.

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

Standard Resistance

RESISTANCE REFERENCE

Tester Condition	Spiral Cable Position	Specified Condition
z12-4 (DIST) - H54-11 (DIST)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
z12-6 (ECC) - H54-2 (ECC)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right

HINT:

The spiral cable makes a maximum of approximately 5 rotations.

NG: REPLACE SPIRAL CABLE (See REMOVAL )

Fig 2: Identifying Z12 Connector Terminal And H54 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

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

Disconnect the A43 distance control ECU connector.

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
H54-11 (DIST) - A43-16 (MODE)	Always	Below 1 Ω
A43-16 (MODE) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Identifying A43 Distance Control ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - BODY GROUND)

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
H54-2 (ECC) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Identifying H54 Connector Terminal

OK: Go to Next Step

INSPECT DISTANCE CONTROL ECU

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

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

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
A43-16 (MODE) - Body ground	Distance control switch ON	Below 2 V
A43-16 (MODE) - Body ground	Distance control switch OFF	11 to 14 V

NG: REPLACE DISTANCE CONTROL ECU (See REMOVAL )

Fig 5: Identifying A43 Connector Terminal

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