Circuit Opening Relay: Inspection

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

REMOVE RELAY BOX COVER
REMOVE CIRCUIT OPENING RELAY (Marking: C/OPN)

Fig 1: Identifying Circuit Opening Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CIRCUIT OPENING RELAY CONTINUITY
1. Using an ohmmeter, check that there is a continuity between terminal 1 and 2.
  If there is no continuity, replace the relay.
2. Check that there is no continuity between terminals 3 and 5.
If there is a continuity, replace the relay.

Fig 2: Checking Continuity Between Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CIRCUIT OPENING RELAY OPERATION
1. Apply the battery positive voltage across terminal 1 and 2.
2. Using an ohmmeter, check that there is a continuity between terminal 3 and 5.
  If there is no continuity, replace the relay.
Fig 3: Checking Continuity Between Terminal 3 And 5 Using Ohmmeter
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REINSTALL CIRCUIT OPENING RELAY
REINSTALL RELAY BOX COVER