Skid Control ECU Communication Stop Mode: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPEN IN CAN BUS WIRE (SKID CONTROL ECU BRANCH LINE)

Turn the engine switch off.
Disconnect the skid control ECU connector (J77).

Measure the resistance according to the value(s) in the table below.

Fig 1: Identifying Skid Control ECU Connector

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Standard Resistance

Tester Connection	Condition	Specified Value
J77-8 (CANH) - J77-16 (CANL)	Engine switch off	54 to 69 Ω

NG → REPAIR OR REPLACE SKID CONTROL ECU BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)

OK: Go to next step

CHECK WIRE HARNESS (IG1, GND1)

Disconnect the skid control ECU connectors (J78) and (A35).

Measure the resistance according to the value(s) in the table below.

Fig 2: Identifying Skid Control ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Condition	Specified Value
J78-26 (GND1) - Body ground	Always	Below 1 Ω

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Value
J77-1 (IG1) - Body ground	Engine switch on (IG)	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 3

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to REMOVAL