Driver Side 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 FOR DTC
- Clear DTCs. Refer to DTC CHECK / CLEAR .
- Check for DTCs B2271, B2272 and B2274.
Result
Result Proceed to No DTC is output A Any of DTCs is output B
B → See step 5
A: Go to next step
- CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU LH - BATTERY)
- Disconnect the front power seat switch LH (position control ECU) connectors.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition U6-5 (+B) - Body ground Always 11 to 14 V U7-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V U7-8 (SYSB) - Body ground Always 11 to 14 V
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU LH - GROUND)
- Measure the resistance according to the value(s) in the table below.
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Standard Resistance
Tester Connection Condition Specified Condition U6-1 (GND) - Body ground Always Below 1 Ω
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 4
- Measure the resistance according to the value(s) in the table below.
- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to DIAGNOSTIC TROUBLE CODE CHART