Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR ANY FOREIGN OBJECT
1. Check that no foreign object is in the steering pad switch cover.
  OK:
  
  No foreign object.
NG: REMOVE FOREIGN OBJECT

OK: Go to next step

CHECK WIRE HARNESS (INSTRUMENT CLUSTER FINISH PANEL CENTER - SPIRAL CABLE)

Disconnect the M6 panel connector.

Fig 1: Identifying M6 Panel Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the C10 cable connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
M6-2 (TLSW) - C10-7 (TLSW)	Below 1 Ω
M6-3 (TLSW-) - C10-3 (ECC)	Below 1 Ω
M6-3 (TLSW-) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK STEERING PAD SWITCH MODULATOR (TEL 2 VOLTAGE)

Fig 2: Identifying Steering Pad Switch Modulator Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the switch.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
6 (TLSW) - 4 (ECC2)	Steering pad TEL switch not pushed	Below 5 V
6 (TLSW) - 4 (ECC2)	Steering pad TEL switch pushed	Below 1 V

NG: REPLACE STEERING PAD SWITCH MODULATOR

OK: Go to next step

CHECK CRUISE CONTROL MAIN SWITCH ASSEMBLY

Fig 3: Identifying Cruise Control Main Switch Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the switch connectors.

Measure the resistance of the switch.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
A-7 (TLSW) - B-6 (TLSW)	Below 1 Ω
A-3 (ECC) - B-4 (ECC2)	Below 1 Ω

NG: REPLACE CRUISE CONTROL MAIN SWITCH ASSEMBLY

OK: Go to next step

INSPECT SPIRAL CABLE SUB-ASSEMBLY

Fig 4: Identifying Spiral Cable Connector Terminals

Disconnect the cable connectors.

Measure the resistance of the cable.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
C10-3 (ECC) - A-3 (ECC)	Below 1 Ω
C10-7 (TLSW) - A-7 (TLSW)	Below 1 Ω

NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY

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