Inspection Procedure

1. Disconnect the H14 HV control ECU connector.
2. Disconnect the A18 airbag ECU connector.
3. Turn the power switch ON (IG).
4. Measure the voltage between the terminal of the HV control ECU connector and body ground.
   1. Standard: 
   VOLTAGE CHECK
   
   

   Tester Connection	Specified Condition
   ABFS (H14-20) - Body ground	Below 1 V

5. Turn the power switch OFF.
6. Check the resistance between the wire harness side connectors.
   Fig 1: Measuring Voltage Between Terminal Of HV Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Standard (Check for open): 
   RESISTANCE CHECK
   
   

   Tester Connection	Specified Condition
   ABFS (H14-20) - GSW2 (A18-22)	Below 1Ω

   1. Standard (Check for short): 
   RESISTANCE CHECK
   
   

   Tester Connection	Specified Condition
   ABFS (H14-20) or GSW2 (A18-22) - Body ground	10 kΩ or higher

7. Reconnect the airbag ECU connector.
8. Reconnect the HV control ECU connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Airbag ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE AIR BAG ECU ASSY (See  AIR BAG RESTRAINT SYSTEMS  )