Cruise Control Switch Circuit: Procedure

1. Check the Data List for proper functioning of the cruise control switch. Refer to DATA LIST / ACTIVE TEST [09/2012 - ] .
   RADAR CRUISE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Cruise Control Main Switch	Cruise control switch signal (Main CPU)/ON or OFF	ON: Cruise control switch is ON OFF: Cruise control switch is OFF	-
   Cancel Switch	Cancel switch signal / ON or OFF	ON: CANCEL switch ON OFF: CANCEL switch OFF	-
   SET/COAT Switch	-/SET switch signal/ON or OFF	ON: -/SET switch ON OFF: -/SET switch OFF	-
   RES/ACC Switch	+/RES switch signal/ON or OFF	ON: +/RES switch ON OFF: +/RES switch OFF	-

   OK

   When cruise control switch operation is performed, the results are same as above.

NG → See step   2 

OK → See step   6 

1. Remove the cruise control switch. Refer to REMOVAL [09/2012 - ] .
2. Inspect the cruise control switch. Refer to INSPECTION [09/2012 - ] .

NG → See step   7 

OK: Go to next step 

1. Remove the spiral cable sub-assembly. Refer to REMOVAL [09/2012 - ] .
2. Inspect the spiral cable sub-assembly. Refer to INSPECTION [09/2012 - ] .

NG → See step   8 

OK: Go to next step 

1. Disconnect the z2 cable connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the A switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z2-3 - A-3	Always	Below 1 Ω
   z2-4 - A-1	Always	Below 1 Ω
   z2-1 - A-2	Always	Below 1 Ω
   A-3 - Body ground	Always	10 kΩ or higher
   A-1 - Body ground	Always	10 kΩ or higher
   A-2 - Body ground	Always	10 kΩ or higher

NG → REPLACE CRUISE CONTROL SWITCH WIRE 

OK: Go to next step 

1. Disconnect the L126 cable connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the A33 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L126-1 (CCS) - A33-27 (CCS)	Always	Below 1 Ω
   L126-8 (R/N) - A33-30 (CCHG)	Always	Below 1 Ω
   L126-2 (ECC) - Body ground	Always	Below 1 Ω
   L126-1 (CCS) - Body ground	Always	10 kΩ or higher
   L126-8 (R/N) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   9