Inspection Procedure

1. Check if the illumination for the multi-display, steering pad switch, glove box light, cigarette lighter, or others (seat heater switch, front seat memory switch, etc.) comes on when the light control switch is turned to the head or tail position.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   Illumination comes on for all components except steering pad switch.	A
   Illumination comes on for all components except radio receiver.	B
   Illumination comes on for all components except multi-display.	C
   No illumination comes on for radio receiver, multi-display, glove box light, front seat memory switch, cigarette lighter, etc.	D

B:  Go to step  7

C:  Go to step  8

D: GO TO LIGHTING SYSTEM  (See PROBLEM SYMPTOMS TABLE )

A: Go to next Step 

1. Disconnect the E12 cable connector.
2. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   E12-12 (IL+2) - Body ground	Always	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Identifying E12 Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next Step 

Fig 2: Steering Pad Switch Connectors (w/ Dynamic Radar Cruise Control System)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Steering Pad Switch Connectors (w/o Dynamic Radar Cruise Control System)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the z51 switch connector.
2. Apply battery voltage to the connector, and check the LED illumination condition.

   OK 

   MEASUREMENT SPECIFIED CONDITION CHART
   
   

   Measurement Condition	Specified Condition
   Battery positive (+) → Terminal 1 (IL+2) Battery negative (-) → Terminal 8 (EAU)	LED illuminates

NG: REPLACE STEERING PAD  (See REMOVAL )

OK: Go to next Step 

1. Disconnect the z35 cable connector.
2. Disconnect the switch connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   z35-5 (IL+2) - 1 (IL+2)	Always	Below 1 Ω
   z35-8 (EAU) - 8 (EAU)

NG: REPLACE NO. 1 SWITCH WIRE 

Fig 4: Identifying Z35 Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next Step 

Fig 5: Identifying E12 And Z35 Cable Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E12 and z35 cable connectors.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   E12-12 (IL+2) - z35-5 (IL+2)	Spiral cable is turned 2.5 rotations counterclockwise	Below 3 a
   	Spiral cable is centered
   	Spiral cable is turned 2.5 rotations clockwise
   E12-4 (EAU) - z35-8 (EAU)	Spiral cable is turned 2.5 rotations counterclockwise	Below 3 Ω
   	Spiral cable is centered
   	Spiral cable is turned 2.5 rotations clockwise

   CAUTION: 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. Be sure to read the Precaution for the SRS (See AIRBAG SYSTEM ).

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY  (See REMOVAL )

OK: Go to next Step 

1. Disconnect the F23 receiver connector.
2. Disconnect the E12 cable connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   F23-6 (SWG) - E12-4 (EAU)	Always	Below 1 Ω
   F23-6 (SWG) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 6: Identifying F23 Receiver Connector And E12 Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. Disconnect the F1 receiver connector.
2. Disconnect the E77 meter connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   F1-12 (ILL-) - E77-17 (ILL-)	Always	Below 1 Ω
   F1-12 (ILL-) - Body ground	Always	10 kΩ or higher

4. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Switch Condition	Specified Condition
   F1-2 (ILL+) - Body ground	Light control switch tail or head	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 7: Identifying F1 Receiver Connector And E77 Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL  )

1. Disconnect the F28 display connector.
2. Disconnect the E77 meter connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   F28-5 (HILL) - E77-17 (ILL-)	Always	Below 1 Ω
   F28-5 (HILL) - Body ground	Always	10 kΩ or higher

4. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Switch Condition	Specified Condition
   F28-12 (ILL+) - Body ground	Light control switch tail or head	11 to 14 V

   Fig 8: Identifying F28 Display Connector And E77 Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   OK (w/ Navigation System)	A
   OK (w/o Navigation System)	B
   NG	C

B: REPLACE MULTI-DISPLAY ASSEMBLY  (See REMOVAL  )

C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

A: REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY  (See REMOVAL )