Cooling Fan System: Inspection

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT COOLING FAN RELAY
1. Check the continuity.
  1. Using an ohmmeter, check for continuity between the terminals.
    
    Fig 1: Checking Continuity Using An Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard:
    
    Fig 2: Continuity Between Terminals Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the result is not as specified, replace the cooling fan relay.
2. Check the operation.
  1. Apply battery positive voltage across terminals 1 and 2.
    
    Fig 3: Applying Battery Positive Voltage Across Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
    If there is no continuity, replace the cooling fan relay.
INSPECT COOLING FAN RELAY NO.2
1. Check the continuity.
  1. Using an ohmmeter, check for continuity between the terminals.
    
    Fig 4: Identifying Cooling Fan Relay Continuity
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard:
    
    Fig 5: Continuity Terminals Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the result is not as specified, replace the cooling fan relay.
2. Check the operation.
  1. Apply battery positive voltage across terminals 1 and 2.
  2. Using an ohmmeter, check that there is no continuity between terminals 3 and 4.
    If there is continuity, replace the cooling fan relay.
  3. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
    If there is no continuity, replace the cooling fan relay.
INSPECT COOLING FAN RELAY NO.3
1. Check the continuity.
  1. Using an ohmmeter, check for continuity between the terminals.
    
    Fig 7: Using An Ohmmeter Checking Continuity Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard:
    
    Fig 8: Continuity Terminals Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the result is not as specified, replace the cooling fan relay.
2. Check the operation.
  1. Apply battery positive voltage across terminals 1 and 2.
  2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
    If there is no continuity, replace the cooling fan relay.
    
    Fig 9: Applying Battery Positive Voltage Across Terminals 1 And 2
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT TEMPERATURE DETECT SWITCH
1. Check the continuity.
  1. Using an ohmmeter, check for continuity between the terminals.
    
    Fig 10: Checking Continuity Between Temperature Detect Switch Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard:
    
    Fig 11: Temperature Detect Switch Continuity Terminals Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the result is not as specified, replace the temperature detect switch.
INSPECT TEMPERATURE DETECT SWITCH NO.2
1. Check the continuity.
  1. Using an ohmmeter, check for continuity between the terminals.
    
    Fig 12: Checking Continuity Between Temperature Detect Switch No. 2 Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard:
    
    Fig 13: Temperature Detect Switch No. 2 Continuity Terminals Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the result is not as specified, replace the temperature detect switch.