Inspection Procedure

1. Check if the illumination for the display and navigation module display, steering pad switch, glove box light, cigarette lighter, or other parts (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 CHART
   
   

   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 display and navigation assembly.	C
   No illumination comes on for all components.	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 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   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 Spiral Cable Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step 

1. Disconnect the z35 cable connector.
2. Disconnect the z51 steering pad switch connector.
3. Measure the resistance according to the valve(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   Z35-8-Z51-8	Always	Below 1 Ω
   Z35-5-Z51-1	Always	Below 1 Ω
   z35-8 - Body ground	Always	10 kΩ or higher
   Z35-5 - Body ground	Always	10 kΩ or higher

NG: CHECK NO. 1 SWITCH WIRE 

Fig 2: Identifying Spiral Cable And Steering Pad Switch Connector

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OK: Go to Next Step 

Fig 3: Identifying Steering Pad Connector Terminals - W/ Dynamic Radar Cruise Control System

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Fig 4: Identifying Steering Pad Connector Terminals - W/O Dynamic Radar Cruise Control System

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1. Disconnect the z51 steering pad switch connector.
2. Connect the positive (+) lead to terminal 1 (IL+2) and the negative (-) lead to terminal 8 (EAU) of the steering pad switch connector.
3. Check if the illumination for the steering pad switch comes on.

   OK: Illumination for the steering pad switch comes on. 

NG: REPLACE STEERING PAD  (See REMOVAL )

OK: Go to Next Step 

Fig 5: Identifying Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Spiral Cable Position	Specified Condition
   E12-12(IL+2) - z35-5 (IL+2)	2.5 rotations to left	Below 3 Ω
   	Center
   	2.5 rotations to right
   E12-4(EAU) - z35-8 (EAU)	2.5 rotations to left	Below 3 Ω
   	Center
   	2.5 rotations to 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. Be sure to read the Precaution for the supplemental restraint system (See AIRBAG SYSTEM ).

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

OK: Go to Next Step 

Fig 6: Identifying Spiral Cable And Display And Navigation Module Display And Radio Receiver Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E12 spiral cable connector.
2. Disconnect the F1 and F23 receiver connectors.
3. Disconnect the F28 display connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   E12-12(IL+2) - F1-2 (ILL+)	Always	Below 1 Ω
   E12-12(IL+2) - F28-12 (ILL+)	Always	Below 1 Ω
   E12-4 (EAU) - F23-6 (SWG)	Always	Below 1 Ω
   E12-12 (IL+2) - Body ground	Always	10 kΩ or higher
   E12-4 (EAU) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   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 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   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 Radio Receiver And Combination 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 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   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 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 8: Identifying Display And Navigation Module Display And Combination Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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