Cruise Control Switch Circuit: Wiring Diagram

1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the intelligent tester main switch on.
3. Check the DATA LIST for proper functioning of the cruise control main switch.
   Fig 2: Turning Engine Switch On (IG) And Intelligent Tester Main Switch On

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   ECM (Cruise control): 

   DATA LIST
   
   

   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: SET / COAST switch ON OFF: SET / COAST switch OFF	-
   RES/ACC SW	RES/ACC switch signal / ON or OFF	ON: RES / ACC switch ON OFF: RES / ACC switch OFF	-

   OK : When cruise control main switch operation is performed, the result will be same as above. 

   Result: 

   PROBLEM SYMPTOM CHART
   
   

   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 

1. Disconnect the cruise control main switch connector.
   Fig 3: Inspecting Cruise Control Main Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 2, 1 - 3	Neutral	10 kΩ or higher
   1 - 3	RES/ACC	235 to 245 Ω
   1 - 3	SET/COAST	620 to 640 Ω
   1 - 3	CANCEL	1510 to 1570 Ω
   1 - 3	Main Switch OFF	10 kΩ or higher
   1 - 3	Main Switch ON	Below 1 Ω
   1 - 2	MODE	Below 1 Ω

NG : REPLACE CRUISE CONTROL MAIN SWITCH 

OK : GO TO NEXT STEP 

1. Disconnect the spiral cable connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Condition	Specified Condition
   A-1 - K20-7	Below 1 Ω
   A-3 - K20-1	Below 1 Ω
   A-4 - K20-2	Below 1 Ω

NG : REPLACE SPIRAL CABLE 

Fig 4: Identifying Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

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

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   K20-1 - A7-31 (CCS)	Always	Below 1 Ω
   K20-7 - A6-20 (CCHG)	Always	Below 1 Ω
   K20-1 - Body ground	Always	10 kΩ or higher
   K20-7 - Body ground	Always	10 kΩ or higher

NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

Fig 5: Identifying Spiral Cable - ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

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

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   K20-2 - Body ground	Always	Below 1 Ω

NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

Fig 6: Identifying Spiral Cable - Body Ground Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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