Inspection Procedure

Fig 1: Inspecting Steering Pad Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the steering pad switch assembly.
2. Measure the resistance of the switch cable connector.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   A-4 (DIST) - A-6 (ECC)	Distance control switch ON	Below 2.5 Ω
   A-4 (DIST) - A-6 (ECC)	Distance control switch OFF	10 kΩ or higher

NG: REPLACE STEERING PAD SWITCH ASSEMBLY 

OK: Go to Next Step 

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

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   A-4 (DIST) - K20-11 (DIST)	Below 1 Ω
   A-6 (ECC) - K20-2 (ECC)	Below 1 Ω

Fig 2: Inspecting Spiral Cable Sub-Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY 

OK: Go to Next Step 

1. Disconnect the K13 ECU connector.
2. Disconnect the K20 spiral cable connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   K20-11 (DIST) - K13-16 (MODE)	Below 1 Ω
   K13-16 (MODE) - Body ground	10 kΩ or higher

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Disconnect the K20 spiral cable connector.
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   K20-2 (ECC) - Body ground	Below 1 Ω

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Remove the distance control ECU (cruise control ECU) with the connector.
2. Turn the power switch ON (IG).
3. Measure the voltage of the connector.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   K13-16 (MODE) - K13-12 (GND)	Distance control switch ON	Below 2 V
   K13-16 (MODE) - K13-12 (GND)	Distance control switch OFF	9 to 16 V

   Fig 5: Identifying Cruise Control ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE DISTANCE CONTROL ECU (CRUISE CONTROL ECU) 

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