Cruise Control Switch Circuit

Circuit diagnosis

DESCRIPTION

The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. Then the ECM reads the voltage value that has been changed by the switch operation to control SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. READ VALUE ON INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the intelligent tester main switch on.

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

ECM (Cruise control):
Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
MAIN SW (MAIN)	Main switch signal (Main CPU)/ON or OFF	ON: Main switch on (Pushed on) OFF: Main switch off (Pushed 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	Proceed to
OK	A
NG (All items are defective)	B
NG (1 to 3 items are defective)	C

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE CRUISE CONTROL MAIN SWITCH

B

2. INSPECT CRUISE CONTROL MAIN SWITCH

Remove the cruise control main switch (Click here).

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

Standard resistance:

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 off	10 kΩ or higher
A-1 (CCS) - A-3 (ECC)	Main Switch on	Below 1 Ω

REPLACE CRUISE CONTROL MAIN SWITCH

OK

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

Disconnect the m1 connector from the spiral cable.

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

Standard resistance
Tester connection	Specified condition
A-1 - m1-3	Below 1 Ω
A-3 - m1-4	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. CHECK SPIRAL CABLE

NOTICE:
: 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:

Removal (Click here)
Installation (Click here)

Remove the spiral cable.

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

Standard resistance
Tester Connection	Spiral Cable Position	Specified Condition
m1-3 - J24-1 (CCS)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
m1-4 - J24-2 (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.

REPLACE SPIRAL CABLE

OK

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

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

Standard resistance:

Tester Connection	Condition	Specified Condition
J24-1 - A6-31 (CCS)	Always	Below 1 Ω
A6-31 (CCS) - Body ground	Always	10 kΩ or higher
J24-2 (ECC) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM