Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU -AIRBAG ECU)

Disconnect the H14 HV control ECU connector.
Disconnect the A18 airbag ECU connector.
Turn the power switch ON (IG).

Measure the voltage between the terminal of the HV control ECU connector and body ground.

Standard:

VOLTAGE CHECK

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

Turn the power switch OFF.

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

Standard (Check for open):

RESISTANCE CHECK

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

Standard (Check for short):

RESISTANCE CHECK

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

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying Airbag ECU Connector Terminal

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