Cruise Control Switch Circuit: Procedure

Fig 1: Checking Cruise Control Main Switch Operation

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester ON.
4. Enter the following menus: Powertrain / Cruise Control / Data List.
5. According to the display on tester, read the "DATA LIST".

   ECM (Cruise Control System)

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

   RESULT:
   
   

   Result	Proceed to
   OK	A
   NG (All items are defective)	B
   NG (1 to 5 items are defective)	C

   OK

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

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

C → See step   6 

B: Go to next step 

1. Remove the cruise control main switch.
   Fig 2: Inspecting Cruise Control Main Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance.

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   1 - 3	cruise control switch neutral	10 kΩ or higher
   	cruise control switch ON	Below 1 Ω
   	cruise control switch OFF	10 kΩ or higher
   	+/RES	216 to 264 Ω
   	-/SET	567 to 693 Ω
   	CANCEL	1,386 to 1,694 Ω

3. Reinstall the cruise control main switch.

NG → See step   6 

OK: Go to next step 

1. Disconnect the spiral cable side connector.
   Fig 3: Checking Harness And Connector (Cruise Control Main Switch - Spiral Cable)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the cruise control main switch side connector.
3. Measure the resistance.

   Standard resistance

   Tester Connection	Specified Condition
   Terminal 1 (ECC) main switch side - Terminal 4 (ECC) spiral cable side	Below 1 Ω
   Terminal 3 (CCS) main switch side - Terminal 5 (CCS) spiral cable side	Below 1 Ω

4. Reconnect the spiral cable side connector.
5. Reconnect the cruise control main switch side connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the spiral cable.
   Fig 4: Inspecting ECC & CCS Circuit At Spiral Cable

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance.

   Standard resistance

   Tester Connection	Specified Condition
   Terminal 5 (CCS) main switch side - CCS (E17-5)	Below 1 Ω
   Terminal 4 (ECC) main switch side - ECC (E17-4)	Below 1 Ω

   HINT: 

   The spiral cable makes a maximum of approximately 5 rotations.

3. Reinstall the spiral cable.

NG → See step   7 

OK: Go to next step 

1. Disconnect the E77 ECM connector.
2. Disconnect the E17 spiral cable (vehicle side) connector.
3. Measure the resistance.

   Standard resistance

   Tester Connection	Specified Condition
   E77-11 (CCS) - E17-5 (CCS)	Below 1 Ω
   E77-11 (CCS) or E17-5 (CCS) - Body ground	10 kΩ or higher
   E17-4 (ECC) - Body ground	Below 1 Ω

4. Reconnect the ECM connector.
5. Reconnect the spiral cable (vehicle side) connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8