Cruise Control Switch Circuit: Procedure

1. Check the Data List T for proper functioning of the cruise control switch.
   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 

Fig 1: Inspecting Cruise Control Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the cruise control switch connector.
2. Measure the resistance of the switch.

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   1 - 3	RES/ACC switch is held ON	235 to 245 Ω
   1 - 3	SET/COAST switch is held ON	620 to 640 Ω
   1 - 3	CANCEL switch is held ON	1510 to 1570 Ω
   1 - 3	Cruise control switch OFF	10 kΩ or higher
   1 - 3	Cruise control switch ON	Below 1 Ω
   1 - 2	MODE switch is held ON	Below 1 Ω

NG → See step   7 

OK: Go to next step 

1. Remove the spiral cable sub-assembly. Refer to REMOVAL .
   Fig 2: Identifying Spiral Cable Sub-Assembly

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   z2-3 - L134-1 (CCS)	Always	Below 1 Ω
   z2-1 - L134-8 (R/N)	Always	Below 1 Ω
   z2-4 - L134-2 (ECC)	Always	Below 1 Ω

NG → See step   8 

OK: Go to next step 

Fig 3: Inspecting Cruise Control Switch Wire

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the z2 spiral cable connector.
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
   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 → See step   9 

OK: Go to next step 

Fig 4: Identifying L134 Spiral Cable And A33 ECU Harness Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L134 spiral cable connector.
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
   L134-1 (CCS) - A33-27 (CCS)	Always	Below 1 Ω
   L134-8 (R/N) - A33-30 (CCHG)	Always	Below 1 Ω
   L134-2 (ECC) - Body ground	Always	Below 1 Ω
   L134-1 (CCS) - Body ground	Always	10 kΩ or higher
   L134-8 (R/N) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10