Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
E78-4 (SLP1) - E78-2 (SGND)	Engine switch off Engine switch on (ACC or IG)	Below 1 V

Fig 1: Identifying Steering Lock Actuator Assembly Connector Terminal E78

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START FUNCTION

NG: Go to Next Step

CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU)

Disconnect the E78 connector from the steering lock actuator assembly.
Disconnect the E61 connector from the main body ECU.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
E78-4 (SLP1) - E61-18 (SLP)	Always	Below 1 Ω
E78-4 (SLP1) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Steering Lock Actuator Assembly Connector Terminal E78

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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