Check Power Supply And Ground Circuit

1. Disconnect the connector of body integrated unit.
2. Measure the voltage between the body integrated unit connector and chassis ground.

   Connector & terminal 

   (i84) No. 6 (+) - Chassis ground (-):

   (il71) No. 1 (+) - Chassis ground (-):

   (B281) No. 7 (+) - Chassis ground (-): (model without keyless access with push button start)

Is the voltage 9 V or more?

Yes:  Go to  2.

No:  Check the harness for open or short circuit between body integrated unit and fuse.

Measure the resistance between the body integrated unit connector and chassis ground.

Connector & terminal 

(i84) No. 1 - Chassis ground:

(B280) No. 1 - Chassis ground:

Is the resistance less than 10 Ω?

Yes:  The power supply and ground circuit are OK.

No:  Repair or replace the harness.