Inspection Procedure

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

READ VALUE USING TECHSTREAM

Connect the Techstream to the DLC3.
Turn the ignition switch on (IG).
Turn the Techstream on.
Enter the following menus: Powertrain / Laser Cruise / Data List.

Check the Data List for proper functioning of the distance control switch.

ECM (Laser Cruise):

ECM SPECIFICATION

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Car Dist Time Setting	Car distance time setting condition/SHORT, MID, LONG, NO	Distance selected by distance control switch	-

OK:

Distance selected by the distance control switch is shown on the display.

NG: Go to step 2

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

INSPECT STEERING PAD SWITCH ASSEMBLY

Remove the steering pad switch assembly.

Measure the resistance between terminals 4 (DIST) and 6 (ECC) of the steering pad switch assembly connector when the distance control switch is operated.

Standard resistance

RESISTANCE REFERENCE

Switch Position	Specified Condition
Distance control switch is ON	Below 2.5 Ω
Distance control switch is OFF	100 kΩ or higher

HINT:

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

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

Fig 1: Identifying ECC And DIST Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 prevent the airbag from deploying.

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 Connection	Spiral Cable Position	Specified Condition
y1-4 - D15-11	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
y1-6 - D15-2	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 STEERING PAD SWITCH ASSEMBLY

Fig 2: Identifying D15 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HARNESS AND CONNECTOR (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

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
D15-11 - A20-16 (MODE)	Always	Below 1 Ω
A20-16 (MODE) - Body ground	Always	10 kΩ or higher

NG: REPLACE SPIRAL CABLE

Fig 3: Identifying A20 And D15 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
D15-2 - Body ground	Always	Below 1 Ω

NG: REPLACE SPIRAL CABLE

Fig 4: Identifying D15 Connector Terminal

OK: Go to next step

INSPECT DISTANCE CONTROL ECU

Remove the distance control ECU with the connector.
Turn the ignition switch on (IG).

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A20-16 (MODE) - Body ground	Distance control switch ON	0 to 2 V
A20-16 (MODE) - Body ground	Distance control switch OFF	9 to 16 V

Fig 5: Identifying A20 Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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