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.

READ VALUE ON INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Fig 1: Identifying Cruise Control Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Turn the ignition switch on and turn the intelligent tester main switch on.

Check the DATA LIST for proper functioning of the cruise control main switch.

ECM (Cruise control):

NORMAL CONDITION TABLE

Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
MAIN SW (MAIN)	Main switch signal (Main CPU)/ ON or OFF	ON: Main switch on OFF: Main switch off	-
CANCEL SW	CANCEL switch signal/ON or OFF	ON: CANCEL switch on OFF: CANCEL switch off	-
SET/COAST SW	SET/COAST switch signal/ON or OFF	ON: - (COAST)/SET switch on OFF: - (COAST)/SET switch off	-
RES/ACC SW	RES/ACC switch signal/ON or OFF	ON: + (ACCEL)/RES (RESUME) switch on OFF: + (ACCEL)/RES (RESUME) switch off	-

OK:

When the cruise control main switch is operated, the display changes as shown above.

Result

RESULT TABLE

Result	Proceed to
OK	A
NG (All items are defective)	B
NG (1 to 3 items are defective)	C

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

C: REPLACE CRUISE CONTROL MAIN SWITCH

B: Go to Next Step

INSPECT CRUISE CONTROL MAIN SWITCH

Remove the cruise control main switch (See REMOVAL ).

Fig 2: Identifying Cruise Control Main 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	Switch Condition	Specified Condition
A-1 (CCS) - A-3 (ECC)	Neutral	10 kΩ or higher
A-1 (CCS) - A-3 (ECC)	+ (ACCEL)/RES (RESUME)	216 to 264 Ω
A-1 (CCS) - A-3 (ECC)	- (COAST)/SET	567 to 693 Ω
A-1 (CCS) - A-3 (ECC)	CANCEL	1,386 to 1,694 Ω
A-1 (CCS) - A-3 (ECC)	Main Switch on	Below 1 Ω

NG: REPLACE CRUISE CONTROL MAIN SWITCH

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - SPIRAL CABLE)

Disconnect the M1 connector from the spiral cable.

Fig 3: Identifying M1 Connector 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
A-1 - m1-3	Always	Below 1 Ω
A-3 - m1-4	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK 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.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester Connection	Spiral Cable Position	Specified Condition
m1-3 - C13-1 (CCS)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
m1-4 - C13-2 (ECC)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right

Fig 4: Identifying M1 & C13 Connector Terminals

HINT:

The spiral cable makes a maximum of approximately 5 rotations.

NG: REPLACE SPIRAL CABLE

OK: Go to Next Step

CHECK WIRE HARNESS (SPIRAL CABLE - ECM AND BODY GROUND)

Disconnect the E6 connector from the ECM.

Fig 5: Identifying C13 & E6 Connector 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
C13-1 - E6-2 (CCS)	Always	Below 1 Ω
E6-2 (CCS) - Body ground	Always	10 kΩ or higher
C13-2 (ECC) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM