Inspection Procedure

CAUTION: The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution for the SRS (See AIRBAG SYSTEM ).

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

READ VALUE USING TECHSTREAM (VEHICLE DISTANCE)

Using the Techstream, read the Data List.

Radar Cruise

DATA LIST - RADAR CRUISE

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

OK: Normal conditions listed above are displayed.

NG: Go to step 2

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

CHECK NO. 1 SWITCH WIRE

Disconnect the z35 and z51 No. 1 switch wire connectors.

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
z35-4(DIST) - z51-2 (DIST)	Always	Below 1 Ω
z35-6 (ECC) - z51-10 (ECC)	Always	Below 1 Ω

NG: REPLACE NO. 1 SWITCH WIRE

Fig 1: Identifying Z35 And Z51 No. 1 Switch Wire Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT STEERING PAD SWITCH

Disconnect the z35 steering pad switch connector from the spiral cable.

Fig 2: Identifying Z35 Steering Pad Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
Z35-4 (DIST) - z35-6 (ECC)	Distance control switch on (pushed)	Below 1 Ω
Z35-4 (DIST) - z35-6 (ECC)	Distance control switch off (pushed again)	1 MΩ or higher

NG: REPLACE STEERING PAD ASSEMBLY (See REMOVAL )

OK: Go to next step

INSPECT SPIRAL CABLE

Check the spiral cable and connector for scratches, cracks, dents and chips. If any defects are found, replace the spiral cable with a new one.

Check the spiral cable.

Set the spiral cable to the center position (See REMOVAL ).

After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance according to the value(s) in the table below. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance according to the value(s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
Z35-4 (DIST) - E12-11 (DIST)	Always	Below 1 Ω
z35-6 (ECC) - E12-2 (ECC)	Always	Below 1 Ω

After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise. Then while rotating the spiral cable 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

NOTE: As the spiral cable may break, do not rotate the spiral cable more than the specified amount.

Fig 3: Identifying Z35 And E12 Connectors

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
Z35-4 (DIST) - E12-11 (DIST)	Always	Below 1 Ω
z35-6 (ECC) - E12-2 (ECC)	Always	Below 1 Ω

NG: REPLACE SPIRAL CABLE (See REMOVAL )

OK: Go to next step

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

Disconnect the E86 distance control ECU connector.
Disconnect the E12 spiral cable connector.

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E12-2 (ECC) - Body ground	Always	Below 1 Ω
E12-11 (DIST) - E86-16 (MODE)	Always	Below 1 Ω
E12-11 (DIST) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Identifying E86 Distance Control ECU And E12 Spiral Cable Connectors

OK: REPLACE DISTANCE CONTROL ECU (See REMOVAL )