Inspection Procedure

1. Disconnect the R24 and L93 ECU connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   COMMUNICATION LINE
   
   

   Tester Connection	Condition	Specified Condition
   R24-23(MPX1)-L93-5 (S1)	Always	Below 1 Ω

   Fig 1: Identifying R24 And L93 ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Disconnect the R24 ECU connector.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard voltage 

   MAYDAY ECU - VEHICLE BATTERY AND BODY GROUND STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   R24-1 (+B) - Body ground	Always	11 to 14 V

   Fig 2: Identifying R24 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   MAYDAY ECU - VEHICLE BATTERY AND BODY GROUND STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   R24-12 (E) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION