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.

INSPECT FUSE (ABS-IG, IGN)

Remove the ABS-IG fuse from the driver side junction block.
Remove the IGN fuse from the engine room No. 2 relay block.

Measure the resistance of the fuse.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
ABS-IG fuse	Below 1 Ω
IGN fuse	Below 1 Ω

NG: REPLACE FUSE

OK: Go to next step.

CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)

Disconnect the S5, S6, S7 and S8 ECU connectors.

Fig 1: Identifying S5, S6, S7 And S8 ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
S6-6 (IG2) - Body ground	Ignition switch ON	11 to 14 V
S7-6 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
S5-16 (GND4) - Body ground	Below 1 Ω
S5-22 (GND3) - Body ground	Below 1 Ω
S8-6 (GND2) - Body ground	Below 1 Ω
S8-31 (GND1) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step.

CHECK RESISTANCE OF COMMUNICATION LINE

Disconnect the A21 sensor connector.
Disconnect the C8 meter connector.
Disconnect the S6 and S7 ECU connectors.

Fig 2: Identifying A21 Sensor, C8 Meter And S6 And S7 ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connectors.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
S6-17 (MPX1) - C8-3 (MPX-)	Below 1 Ω
S7-3 (MPX2) - A21-13 (MPX1)	Below 1 Ω

Result

RESULT CHART

Result	Proceed to
Both are OK	A
One is OK	B
Both are NG	C

B: REPLACE SKID CONTROL ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR

C: REPAIR OR REPLACE HARNESS AND CONNECTOR

A: REPLACE SKID CONTROL ECU