Inspection Procedure

1. Disconnect the R23 ECU connector.
Fig 1: Identifying R23 ECU And S50 Battery Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the S50 battery connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Condition	Specified Condition
   R23-2 (BBI+) - S50-1 (BBO+)	Always	Below 1 Ω
   R23-9 (BBI-) - S50-2 (BBO-)	Always	Below 1 Ω
   R23-2 (BBI+) or S50-1 (BBO+) - Body ground	Always	10 kΩ or higher
   R23-9 (BBI-) or S50-2 (BBO-) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR THEN CLEAR HISTORIC DTC 

OK: Go to Next Step 

1. Perform registration (see REGISTRATION  ).
2. Check for DTC again (see DTC CHECK / CLEAR  ).

   OK: No DTCs output. 

NG: REPLACE MAYDAY ECU THEN PERFORM REGISTRATION 

OK: END (MAYDAY BATTERY IS FAULTY; CLEAR HISTORIC DTC)