Distance Control ECU Power Source Circuit: 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 DISTANCE CONTROL ECU (B VOLTAGE)

Disconnect the distance control ECU connector.

Fig 1: Identifying Terminals Of Distance Control ECU Connector
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Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
J17-1 (B) - Body ground	Engine switch on (IG)	11 to 14 V

NG → See step 3

OK: Go to next step

CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - BODY GROUND)

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

Fig 2: Identifying Terminals Of Distance Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Condition	Specified Condition
J17-10 (SGND) - Body ground	Always	Below 1 Ω
J17-12 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 5

CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - COWL SIDE JUNCTION BLOCK LH)

Disconnect the LD connector from main body ECU LH (cowl side junction block LH).

Fig 3: Identifying Terminals Of Distance Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Condition	Specified Condition
J17-1 (B) - LD-29	Always	Below 1 Ω
J17-1 (B) or LD-29 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 4

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to Power Source Mode does not Change
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE