Inspection Procedure

1. Disconnect the R23 ECU connector.
2. Disconnect the S50 battery connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   MAYDAY ECU - MAYDAY BATTERY
   
   

   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

   Fig 1: Identifying R23 ECU Connector And S50 Battery Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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)