Inspection Procedure

NOTE: The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the PRECAUTION for the supplemental restraint system (see AIRBAG SYSTEM ).

CHECK WIRE HARNESS (SPIRAL CABLE - BATTERY)

Disconnect the K20 cable connector.

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester connection	Condition	Specified condition
K20-12 (IL+2) - Body ground	Light control switch TAIL or HEAD	10 to 14 V

Fig 1: Identifying K20 Spiral Cable Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK STEERING PAD SWITCH ASSEMBLY

Fig 2: Identifying Steering Pad Switch Assembly Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the switch connector.
2. Connect the positive (+) lead to terminal 5 (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 SWITCH ASSEMBLY

OK: Go to next step

INSPECT SPIRAL CABLE

Disconnect the cable connectors.

Measure the resistance of the cable.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Spiral Cable Position	Specified Condition
K20-4 (EAU) - A-8 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
K20-12 (IL+2) - A-5 (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 PRECAUTION for the supplemental restraint system (see AIRBAG SYSTEM ).

Fig 3: Identifying Steering Pad Switch Side Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK: Go to next step

CHECK WIRE HARNESS (RADIO RECEIVER - BATTERY)

Disconnect the K54 radio connector.

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
K54-2 (ILL+) - Body ground	Light control switch TAIL or HEAD	10 to 14 V

Fig 4: Identifying K54 Radio Receiver Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK WIRE HARNESS (RADIO RECEIVER - SPIRAL CABLE AND COMBINATION METER)

Disconnect the K56 and K54 receiver connectors.
Disconnect the K20 cable connector.
Disconnect the K31 meter connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
K56-6 (SWG) - K20-4 (EAU)	Below 1 Ω
K54-12 (ILL-) - K31-30 (TR)	Below 1 Ω
K56-6 (SWG) - Body ground	10 kΩ or higher
K54-12 (ILL-) - Body ground	10 kΩ or higher

Fig 5: Identifying Radio Receiver, Spiral Cable And Combination Meter Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK WIRE HARNESS (MULTI-DISPLAY - BATTERY AND COMBINATION METER)

Disconnect the K46 display connector.
Disconnect the K31 meter connector.

Measure the voltage and resistance of the wire harness side connectors.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
K46-12 (ILL+) - Body ground	Light control switch TAIL or HEAD	10 to 14 V

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
K46-11 (ILL-) - K31-30 (TR)	Below 1 Ω
K46-11 (ILL-) - Body ground	10 kΩ or higher

Fig 6: Identifying Multi-Display And Combination Meter Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE