"CHK" message(s) are displayed on the SIGNAL CHECK screen.: Procedure

1. Check which items display "CHK" (red) on the SIGNAL CHECK screen.
   Fig 1: Screen Display - Signal Check

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Result	Proceed to
   "MIRROR SW" displays "CHK" (red).	A
   "CAMERA SW" displays "CHK" (red).	B
   Any of "SPEED", "BCTY", "SHIFT", STR SIG", "HANDLE", "ENGINE" and "DEST" displays "CHK" (red).	C

B → See step   3 

C → See step   9 

A: Go to next step 

1. Operate the mirror retract switch to check if the power retract mirror function of the outer rear view mirror assembly RH operates normally. Refer to OPERATION CHECK .

   Result

   Result	Proceed to
   Power retract mirror function is normal	A
   Power retract mirror function is abnormal	B

B → See step   10 

A → See step   9 

1. Remove the steering pad switch assembly. Refer to REMOVAL .
   Fig 2: Measure The Resistance

   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
   z5-7 (+DP) - z5-8 (EAU)	Side monitor main switch pushed in	Below 2.5 Ω
   z5-7 (+DP) - z5-8 (EAU)	Side monitor main switch not pushed	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1

   Component without harness connected (Steering Pad Switch Assembly)

   -

   -

NG → See step   11 

OK: Go to next step 

1. Disconnect the connectors from the steering pad switch and spiral cable.
   Fig 3: Identifying z5 and F40 connectors

   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
   z5-8 (EAU) - F40-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z5-7 (+DP) - F40-3 (+DP)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right

   NOTE:

   The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Refer to information shown in the brackets.

   HINT: 

   • Removal. Refer to REMOVAL
   • Installation. Refer to INSTALLATION
   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Spiral with Sensor Cable Sub-assembly)
   *2	Steering Pad Switch Side
   *3	Vehicle Side

NG → See step   12 

OK: Go to next step 

1. Disconnect the F40 connector from the spiral with sensor cable sub-assembly.
   Fig 4: Identifying F40 Connector

   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
   F40-4 (EAU) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   7 

OK: Go to next step 

1. Disconnect the F54 connector from the parking assist ECU.
   Fig 5: Identifying F54 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the F40 connector from the spiral with sensor cable sub-assembly.
   Fig 6: Identifying F54 Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F54-23 (BLSW) - F40-3 (+DP)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Parking Assist ECU)
   *2	Front view of wire harness connector (to Spiral with Sensor Cable Sub-assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

1. Disconnect the F40 connector from the spiral with sensor cable sub-assembly.
   Fig 7: Identifying F40 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the G4 connector from the display and navigation module display.
   Fig 8: Identifying G4 Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F40-4 (EAU) - G4-23 (SWG)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Spiral with Sensor Cable Sub-assembly)
   *2	Front view of wire harness connector (to Display and Navigation Module Display)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13