Inspection Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Radar Cruise / Data List.
5. Check the Data List for proper functioning of the cruise control main switch.
   Fig 1: Inspecting Cruise Control Main Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   ECM (Radar Cruise): 

   NORMAL CONDITION CHART
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   CCS 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: - (COAST)/SET switch ON OFF: - (COAST)/SET switch OFF	-
   RES/ACC Switch	RES/ACC switch signal / ON or OFF	ON: + (ACCEL)/RES (RESUME) switch ON OFF: + (ACCEL)/RES (RESUME) switch OFF	-

   OK: 

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

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

NG: Go to Next Step 

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

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 3	RES/ACC switch is hold ON	235 to 245 Ω
   1 - 3	SET/COAST switch Is hold ON	620 to 640 Ω
   1 - 3	CANCEL switch Is hold ON	1,510 to 1,570 Ω
   1 - 3	Cruise control main switch OFF	10 kΩ or higher
   1 - 3	Cruise control main switch ON	Below 1 Ω
   1 - 2	MODE switch Is hold ON	Below 1 Ω

Fig 2: Inspecting Cruise Control Main Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE CRUISE CONTROL MAIN SWITCH 

OK: Go to Next Step 

1. Disconnect the A and K20 spiral cable connectors.
2. Measure the resistance of the spiral cable.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Condition	Specified Condition
   A-3 - K20-1 (CCS)	Below 1 Ω
   A-1 - K20-7 (R/N)	Below 1 Ω
   A-4 - K20-2 (ECC)	Below 1 Ω

Fig 3: Identifying K20 Spiral Cable Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY 

OK: Go to Next Step 

1. Disconnect the K20 spiral cable connector.
2. Disconnect the A54 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   K20-1 (CCS) - A54-26 (CCS)	Below 1 Ω
   K20-7 (R/N) - A54-32 (CCHG)	Below 1 Ω
   K20-2 (ECC) - Body ground	Below 1 Ω
   K20-1 (CCS) - Body ground	10 kΩ or higher
   K20-7 (R/N) - Body ground	10 kΩ or higher

Fig 4: Identifying K20 Spiral Cable Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )