Inspection Procedure
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation
- CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)
- Disconnect the A13, A14, E2 and E3 ECM connectors
- Measure the resistance according to the value (s) in the table below
Standard resistance
RESISTANCE SPECIFICATIONTester Connection Condition Specified Condition E3-1 (E1) - Body ground Always Below 1 Ω E2-2 (E01) - Body ground Always Below 1 Ω E2-1 (E02) - Body ground Always Below 1 Ω A13-5 (E03) - Body ground Always Below 1 Ω E3-4 (E04) - Body ground Always Below 1 Ω E2-5 (ME01) - Body ground Always Below 1 Ω A14-1 (EC) - Body ground Always Below 1 Ω - Measure the voltage according to the value (s) in the table below.
Standard voltage
VOLTAGE SPECIFICATIONTester Connection Switch Condition Specified Condition A14-7 (BATT) - Body ground Always 11 to 14 V A13-2 (+B) - Body ground When battery's positive (+) voltage is applied to terminal A14-3 (MREL) 11 to 14 V A13-1 (+B2) - Body ground When battery's positive (+) voltage is applied to terminal A14-3 (MREL) 11 to 14 V A14-5 (FC) - Body ground Power switch ON (IG) 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE ECM (See REMOVAL )