Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2005 Toyota Land CruiserFACTORY OEM SERVICE PROCEDURE

Circuit Opening Relay: Inspection

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

Fig 1: Removing 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 terminal 3 and 5.
  If there is a continuity, replace the relay.
  
  Fig 2: Inspecting Circuit Opening Relay Continuity
  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 & 5
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REINSTALL CIRCUIT OPENING RELAY
REINSTALL RELAY BOX COVER

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready Tools Compare Repair Quote Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.