Cruise Control Switch Circuit [10/2014 - 09/2017]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Radar Cruise / Data List.
5. Read the Data List according to the display on the Techstream.

   Powertrain > Radar Cruise > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Cruise Control Main Switch	Cruise control switch signal	ON or OFF	ON: Cruise control main switch pushed OFF: Cruise control main switch released	-
   RES/ACC Switch	+RES switch signal	ON or OFF	ON: +RES switch on OFF: +RES switch off	-
   SET/COAST Switch	-SET switch signal	ON or OFF	ON: -SET switch on OFF: -SET switch off	-

   Powertrain > Radar Cruise > Data List 

   Tester Display
   Cruise Control Main Switch
   RES/ACC Switch
   SET/COAST Switch

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2014 - 09/2017] 

Result: 

NG 

See step  2

1. Remove the cruise control main switch.

   Refer to REMOVAL [10/2014 - 09/2017]

2. Inspect the cruise control main switch.

   Refer to INSPECTION [10/2014 - 09/2017]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CRUISE CONTROL MAIN SWITCH. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

OK 

See step  3

1. Remove the cruise control switch wire.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Spiral with Sensor Cable Sub-assembly)
   *b	Front view of wire harness connector (to Cruise Control Main Switch)

   Refer to REMOVAL [10/2014 - 09/2017]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z8-1 (R/N) - B2 (R/N)	Always	Below 1 Ω
   z8-3 (CCS) - B3 (CCS)	Always	Below 1 Ω
   z8-4 (ECC) - B1 (ECC)	Always	Below 1 Ω
   z8-1 (R/N) or B2 (R/N) - Body ground	Always	10 kΩ or higher
   z8-3 (CCS) or B3 (CCS) - Body ground	Always	10 kΩ or higher
   z8-4 (ECC) or B1 (ECC) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CRUISE CONTROL SWITCH WIRE. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

OK 

See step  4

1. Remove the spiral with sensor cable sub-assembly.

   Refer to REMOVAL [10/2014 - 09/2017]

2. Inspect the spiral with sensor cable sub-assembly.

   Refer to INSPECTION [10/2014 - 09/2017]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

OK 

See step  5

1. Disconnect the I4 spiral with sensor cable sub-assembly connector.
2. Disconnect the I19 driving support ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I4-1 (CCS) - I19-23 (CCS)	Always	Below 1 Ω
   I4-8 (R/N) - I19-10 (CCHG)	Always	Below 1 Ω
   I4-2 (ECC) - Body ground	Always	Below 1 Ω
   I4-1 (CCS) or I19-23 (CCS) - Body ground	Always	10 kΩ or higher
   I4-8 (R/N) or I19-10 (CCHG) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR