Inspection Procedure
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)
- Measure the voltage according to the value(s) in the table below
Standard Voltage
TESTER CONNECTION TESTER CONNECTION CHARTTester Connection Condition Specified Condition LD-13 (IG) - LD-8 (SGND) Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V LD-13 (IG) - LD-9 (SGND) Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V LM-1 (WIG) - LD-3 (GND) Always 11 to 14 V
NG: Go to step 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
- Measure the voltage according to the value(s) in the table below
- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND)
- Disconnect the LD connector from the main body ECU LH (cowl side junction block LH).
- Measure the resistance according to the value(s) in the table below
Standard Resistance
TESTER CONNECTION TESTER CONNECTION CHARTTester Connection Condition Specified Condition LD-3 (GND) - Body ground Always Below 1 Ω LD-9 (SGND) - Body ground Always Below 1 Ω LD-8 (SGND) - Body ground Always Below 1 Ω
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BATTERY)
- Disconnect the LM connector from the main body ECU LH (cowl side junction block LH)
- Measure the voltage according to the value(s) in the table below
Standard Voltage
TESTER CONNECTION TESTER CONNECTION CHARTTester Connection Condition Specified Condition LD-13(IG) - Body ground Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V LM-1 (WIG) - Body ground Always 11 to 14 V
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )