Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Check Wire Harness . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION .
NOTE:
After removing the IG2 relay, check the electrical condition of each terminal.
- No. 1 terminal: With the IG switch ON, 10 - 14 V
- No. 2 terminal: Continuity between the IG2 relay No. 2 terminal and body ground (less than 1 Ω)
- No. 3 terminal: Continuity between the IG2 relay No. 3 terminal and water pump No. 2 terminal (less than 1 Ω)
- No. 5 terminal: Always 10 - 14 V
  Continuity between the water pump No. 1 terminal and body ground (less than 1 Ω).
1. NG: Repair or replace wire harness.
2. OK: Go to step 2.
Check IG2 Relay
Preparation: Remove the IG2 relay from the engine room J/B.

Check:
1. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
2. Check that there is no continuity between terminals 3 and 5.
  
  Fig 1: Testing IG2 Relay
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Apply battery voltage across terminals 1 and 2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
OK:
1. a has continuity .
2. b has no continuity .
3. c has continuity .
1. NG: Replace IG2 relay.
2. OK: Confirm that water pump is defective and then replace it. Check water pump. See INSPECTION OF HV WATER PUMP .