Check Power Supply And Ground Circuit

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK POWER SUPPLY. Disconnect the harness connector of body integrated unit. Measure the voltage between harness connector terminal and chassis ground. Connector & terminal (B280) No. 1,2 (+) - Chassis ground (-):	Is the voltage more than 10 V?	Go to step 2.	Check the harness for open or short circuit between body integrated unit and fuse.
2 CHECK GROUND CIRCUIT. Measure the resistance between harness connector terminal and chassis ground. Connector & terminal (B280) No. 4, 13 - Chassis ground:	Is the resistance less than 10 Ω	The power supply and ground circuit are OK.	Repair the harness.

Step

Check

Yes

1 CHECK POWER SUPPLY.

Disconnect the harness connector of body integrated unit.
Measure the voltage between harness connector terminal and chassis ground.
Connector & terminal

(B280) No. 1,2 (+) - Chassis ground (-):

Is the voltage more than 10 V?

Go to step 2.

Check the harness for open or short circuit between body integrated unit and fuse.

2 CHECK GROUND CIRCUIT.
Measure the resistance between harness connector terminal and chassis ground.

Connector & terminal

(B280) No. 4, 13 - Chassis ground:

Is the resistance less than 10 Ω

The power supply and ground circuit are OK.

Repair the harness.