Cooling Fan Relay (GS300)
- Disconnect cooling fan relay. See Figure. Remove cooling fan relay. Use an ohmmeter and check for continuity between terminals No. 1 and 2, and terminals No. 3 and 4. If continuity is not as specified, replace relay.
- Apply battery voltage between relay terminals No. 1 and 2. Using an ohmmeter, check for no continuity between terminals No. 3 and 4. If continuity is not as specified, replace relay.