Check Power Supply And Ground Circuit

CHECK POWER SUPPLY .
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 (-):
  
  (i171) No. 1 (+) - Chassis ground (-):
  
  (B281) No. 7 (+) - Chassis ground (-): (K/L)
Is the voltage 9 V or more?
1. Yes: Go to 2 .
2. No: Check the harness for open or short circuit between body integrated unit and fuse.
CHECK GROUND CIRCUIT .
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?
1. Yes: The power supply and ground circuit are OK.
2. No: Repair or replace the harness.