Main Switch Circuit: Procedure

1. Remove the steering pad switch . Refer to REMOVAL .
2. Disconnect the z9 connector from the spiral cable.
   Fig 1: View Of Steering Pad Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   Component without harness connected (Steering Pad Switch Assembly)

   *2

   Lane Keeping Assist Main Switch

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   z9-4 - z9-6	Lane keeping assist main switch ON	Below 2.5 Ω
   z9-4 - z9-6	Lane keeping assist main switch OFF	10 kΩ or higher

4. Reconnect the connector.
5. Reinstall the steering pad switch . Refer to INSTALLATION .

NG → See step   7 

OK: Go to next step 

1. Remove the spiral cable sub-assembly . Refer to REMOVAL .
   Fig 2: View Of Spiral Cable Sub-Assembly And 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	Condition	Specified Condition
   z9-4 - L52-11 (DIST)	The spiral cable position is center	Below 1 Ω
   	The spiral cable position is 2.5 rotations to the left
   	The spiral cable position is 2.5 rotations to the right
   z9-6 - L52-2 (ECC)	The spiral cable position is center	Below 1 Ω
   	The spiral cable position is 2.5 rotations to the left
   	The spiral cable position is 2.5 rotations to the right

   Callouts For Fig. 12
   
   

   *1	Component without harness connected (Spiral Cable Sub-assembly)

   HINT: 

   The spiral cable makes a maximum of approximately 5 rotations.

3. Install the spiral cable sub-assembly . Refer to INSTALLATION .

NG → See step   8 

OK: Go to next step 

1. Disconnect the driving support ECU connector.
   Fig 3: View Of Driving Support ECU 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	Condition	Specified Condition
   L52-11 (DIST) - L60-6 (SPSW)	Always	Below 1 Ω
   L52-11 (DIST) - Body ground	Always	10 kΩ or higher

   Callouts For Fig. 13
   
   

   *1	Front view of wire harness connector (to Spiral Cable Sub-assembly)
   *2	Front view of wire harness connector (to Driving Support ECU)

3. Reconnect the driving support ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - DRIVING SUPPORT ECU) 

OK: Go to next step 

1. Disconnect the spiral cable connector.
   Fig 4: View Of Spiral Cable 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	Condition	Specified Condition
   L52-2 (ECC) - Body ground	Always	Below 1 Ω

   Callouts For Fig. 14
   
   

   *1	Front view of wire harness connector (to Spiral Cable Sub-assembly)

3. Reconnect the connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BODY GROUND CIRCUIT) 

OK: Go to next step 

1. Turn the power switch on (IG).
   Fig 5: Identifying Driving Support ECU Connector Terminals

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L60-6 (SPSW) - Body ground	Power switch on (IG) Lane keeping assist main switch ON	6 to 7 V
   	Power switch on (IG) Lane keeping assist main switch OFF	10 to 14 V

   Callouts For Fig. 15
   
   

   *1	Component without harness connected (Driving Support ECU)

NG → See step   9 

OK → See step   6