Cruise Control Switch Circuit: Procedure

1. Use the Data List to check if the cruise control switch is functioning properly. Refer to DATA LIST / ACTIVE TEST .
   RADAR CRUISE
   
   

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

   OK

   On screen, each item changes between ON and OFF according to above chart.

NG → See step   2 

OK → See step   6 

1. Remove the cruise control switch. Refer to REMOVAL .
   Fig 1: Identifying Cruise Control Switch, Circuit Diagram & Connector Terminals

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   3 (CCS) - 1 (ECC)	Cruise control switch on	Below 2.5 Ω
   3 (CCS) - 1 (ECC)	Cruise control switch off	1 MΩ or higher
   3 (CCS) - 1 (ECC)	+RES switch held on	235 to 245 Ω
   3 (CCS) - 1 (ECC)	-SET switch held on	617 to 643 Ω
   3 (CCS) - 1 (ECC)	CANCEL switch held on	1509 to 1571 Ω
   2 (R/N) - 1 (ECC)	MODE switch held on	Below 2.5 Ω

NG → See step   8 

OK: Go to next step 

1. Disconnect the z7 spiral with sensor cable sub-assembly connector.
   Fig 2: Identifying z7 Spiral With Sensor Cable & (A) Cruise Control Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A cruise control switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z7-3 (CCS) - A-3 (CCS)	Always	Below 2.5 Ω
   z7-4 (ECC) - A-1 (ECC)	Always	Below 2.5 Ω
   z7-1 (R/N) - A-2 (R/N)	Always	Below 2.5 Ω
   z7-3 (CCS) - Body ground	Always	1 MΩ or higher
   z7-4 (ECC) - Body ground	Always	1 MΩ or higher
   z7-1 (R/N) - Body ground	Always	1 MΩ or higher

NG → REPLACE CRUISE CONTROL SWITCH WIRE 

OK: Go to next step 

1. Remove the spiral with sensor cable sub-assembly. Refer to INSTALLATION - Step 4 .
2. If there are any defects as follows, replace the spiral with sensor cable sub-assembly with a new one: scratches, cracks, dents or chips in the connector or spiral with sensor cable sub-assembly.
   Fig 3: Identifying Spiral With Sensor Cable Connectors & Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the spiral with sensor cable sub-assembly.
   1. Set the spiral with sensor cable sub-assembly to the center position. Refer to REMOVAL .
   2. Rotate the spiral with sensor cable sub-assembly 2.5 times clockwise and measure the resistance according to the value(s) in the table below. Then rotate the spiral with sensor cable sub-assembly 5 times counterclockwise and measure the resistance according to the value(s) in the table below.
      NOTE:

      As the spiral with sensor cable sub-assembly may break, do not rotate the spiral with sensor cable sub-assembly more than the specified amount.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      3 (CCS) - 1 (CCS)	Always	Below 1 Ω
      4 (ECC) - 2 (ECC)	Always	Below 1 Ω
      1 (R/N) - 7 (R/N)	Always	Below 1 Ω

   3. Set the spiral with sensor cable sub-assembly to the center position and rotate the spiral with sensor cable sub-assembly 2.5 times clockwise. Then, while rotating the spiral with sensor cable sub-assembly 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      3 (CCS) - 1 (CCS)	Always	Below 1 Ω
      4 (ECC) - 2 (ECC)	Always	Below 1 Ω
      1 (R/N) - 7 (R/N)	Always	Below 1 Ω

NG → See step   7 

OK: Go to next step 

1. Disconnect the G28 spiral with sensor cable sub-assembly connector.
2. Disconnect the G45 ECM connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G28-1 (CCS) - G45-11 (CCS)	Always	Below 1 Ω
   G28-7 (R/N) - G45-17 (CCHG)	Always	Below 1 Ω
   G28-2 (ECC) - Body ground	Always	Below 1 Ω
   G28-1 (CCS) - Body ground	Always	10 kΩ or higher
   G28-7 (R/N) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   9