Distance Control Switch Circuit: Procedure

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):

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	-

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

NG → See step 2

OK → PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE PROBLEM SYMPTOMS TABLE

INSPECT STEERING PAD SWITCH ASSEMBLY

Remove the steering pad switch assembly.

Fig 1: Steering Pad Switch Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

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 SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE PROBLEM SYMPTOMS TABLE

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

HINT:

Removal. Refer to REMOVAL
Installation. Refer to INSTALLATION

Remove the spiral cable.

Fig 2: Spiral Cable
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

Tester Connection	Spiral Cable Position	Specified Condition
C-4 - D15-11	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
C-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

OK: Go to next step

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

Disconnect the distance control ECU connector.

Fig 3: Disconnecting Distance Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

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

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.

Fig 4: Identifying D15 Connector Terminal

Standard resistance

Tester Connection	Condition	Specified Condition
D15-2 - Body ground	Always	Below 1 Ω

NG → REPLACE SPIRAL CABLE

OK: Go to next step

INSPECT DISTANCE CONTROL ECU

Remove the distance control ECU with the connector.

Fig 5: Distance Control ECU With The Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch on (IG).

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

Standard voltage

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE PROBLEM SYMPTOMS TABLE