Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch operates 7 functions: SET, COAST, TAP-DOWN, RESUME, ACCEL, TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the 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 each arrow direction 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 resistance value that has been changed by the switch operation to control SET, COAST, RESUME, ACCEL and CANCEL.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.

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

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

   Hybrid Vehicle Control ECU (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 switch signal / ON or OFF	ON: -/SET switch ON OFF: -/SET switch OFF	-
   RES/ACC SW	+/RES switch signal / ON or OFF	ON: +/RES switch ON OFF: +/RES switch OFF	-

   
   

   OK:

   When cruise control main switch operation is performed the results will be same as above.
   

   Result: 

   Result	Proceed to
   OK	A
   NG (All items are defective.)	B
   NG (One to four items are defective.)	C

A	PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C	REPLACE CRUISE CONTROL MAIN SWITCH

B

2. INSPECT CRUISE CONTROL MAIN SWITCH

1. Disconnect the cruise control main switch connector.

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

Standard resistance:

Tester Connection	Switch Condition	Specified Condition
1 - 3	Neutral	10 kΩ or higher
1 - 3	+/RES	235 to 245 Ω
1 - 3	-/SET	620 to 640 Ω
1 - 3	CANCEL	1,510 to 1,570 Ω
1 - 3	Main Switch OFF	10 kΩ or higher
1 - 3	Main Switch ON	Below 1 Ω

NG	REPLACE CRUISE CONTROL MAIN SWITCH

OK

3. INSPECT SPIRAL CABLE

1. Disconnect the spiral cable connectors.

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

   Standard resistance:

   Tester Connection	Specified Condition
   A-3 - C13-1	Below 1 Ω
   A-4 - C13-2	Below 1 Ω

NG	REPLACE SPIRAL CABLE

OK

4. CHECK WIRE HARNESS (SPIRAL CABLE - HYBRID VEHICLE CONTROL ECU AND BODY GROUND)

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   C13-1 - H29-26 (CCS)	Always	Below 1 Ω
   H29-26 (CCS) - Body ground	Always	10 kΩ or higher
   C13-1 - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE