Inspection Procedure

1. Check if the illumination for the radio receiver, steering pad switch, integration control & panel assembly, cigarette lighter or others (seat heater switch, hazard 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 integration control & panel assembly.	C
   No illumination comes on (radio receiver, hazard switch, cigarette lighter, integration control & panel assembly, etc.).	D
   illumination comes on only for cigarette lighter and steering pad switch.	E

B: Go to step  6

C: Go to step  8

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

E: GO TO METER / GAUGE SYSTEM  (See PROBLEM SYMPTOMS TABLE )

A: Go to next step 

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

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   J24-12 (IL+2) - Body ground	Light control switch TAIL or HEAD	11 to 14 V

Fig 1: Identifying Spiral Cable Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the steering pad switch assembly connector
2. Connect a positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch assembly connector
   Fig 2: Inspecting Steering Pad Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check if the illumination for the steering pad switch assembly comes on.

   OK: Illumination for the steering pad switch assembly comes on. 

NG: REPLACE STEERING PAD SWITCH ASSEMBLY  (See STEERING PAD SWITCH  )

OK: Go to next step 

1. Disconnect the steering pad switch assembly and spiral cable connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   k1-8 (EAU) - J24-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   k1-5 (IL+2) - J24-12 (IL+2)	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. Be sure to read the article shown in the brackets.
   • Removal (See REMOVAL )
   • Installation (See INSTALLATION )
Fig 3: Identifying Steering Pad Switch Assembly And Spiral Cable Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE  (See REMOVAL )

OK: Go to next step 

1. Disconnect the connectors from the radio receiver and spiral cable.
   Fig 4: Identifying Radio Receiver Connectors

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

   Standard Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J63-6 (SWG) - J24-4 (EAU)	Always	Below 1 Ω
   J63-6 (SWG) - Body ground	Always	10 kΩ or higher

Fig 5: Identifying Spiral Cable Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE RADIO RECEIVER  (See REMOVAL  )

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

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   J66-2 (ILL+) - Body ground	Light control switch TAIL or HEAD	11 to 14 V

Fig 6: Identifying Radio Receiver Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the radio receiver connector and combination meter connector.
   Fig 7: Identifying Radio Receiver Connectors

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

   Standard Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J66-12 (ILL-) - J35-9 (ILL-)	Always	Below 1 Ω
   J66-12 (ILL-) - Body ground	Always	10 kΩ or higher

Fig 8: Identifying Combination Meter Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE RADIO RECEIVER  (See REMOVAL  )

1. Disconnect the integration control & panel assembly connector
2. Measure the voltage according to the value(s) in the table below

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   J54-3 (ILL+) - Body ground	Light control switch TAIL or HEAD	11 to 14 V

Fig 9: Identifying Integration Control & Panel Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the integration control & panel assembly connector and combination meter connector
   Fig 10: Identifying Integration Control & Panel Assembly Connector

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

   Standard Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J54-10 (ILL-) - J35-9 (ILL-)	Always	Below 1 Ω
   J54-10 (ILL-) - Body ground	Always	10 kΩ or higher

Fig 11: Identifying Combination Meter Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE INTEGRATION CONTROL & PANEL ASSEMBLY  (See TERMINALS OF ECU )