SELF-DIAGNOSIS FUNCTION
F-91flowchartHeadlight switch
Headlight switch (05U0FX-102)
1
Turn ON headlight switch
Verify that monitor lamp illuminates
NO
PC: • Headlight switch malfunction (Refer to Section T)
PC: • Headlight switch malfunction (Refer to Section T)
• Open circuit in wire harness from headlight switch to engine control unit
• Engine control unit terminal 1U malfunction (Refer to page F-129)
YES
2
Headlight switch OK
Turn OFF headlight switch
Blower switch
Blower switch (05U0FX-103)
1
Turn blower switch to "medium" position
Verify that monitor lamp illuminates
NO
PC: • Blower switch malfunction (Refer to section T)
PC: • Blower switch malfunction (Refer to section T)
• Open circuit in wire harness from blower switch to engine control unit
• Engine control unit terminal 1S malfunction (Refer to page F-129)
YES
2
Blower switch OK
Turn OFF blower switch
A/C switch
A/C switch (05U0FX-104)
1
Set fan speed control to low position
Turn A/C switch ON, and verify that monitor lamp illuminates
NO
PC: • A/C switch malfunction (Refer to Section U)
PC: • A/C switch malfunction (Refer to Section U)
• Blower switch malfunction
• Open circuit in wire harness from A/C switch to blower switch
• Engine control unit terminal 1U malfunction (Refer to page F-129)
YES
2
A/C switch OK
Turn A/C switch and blower switch OFF
Water thermoswitch circuit (not included in switch inspection)
WARNING
The cooling fan operates when the diagnosis connector terminals TFA and GND are connected a jumper wire. Use caution.
Water thermoswitch circuit (05U0FX-237)
1
Connect diagnosis connector terminals TFA and GND with a jumper wire
Verify that monitor lamp illuminates
NO
PC: • Relay malfunction (Refer to Section E)
PC: • Relay malfunction (Refer to Section E)
• Open circuit in wire harness from water thermoswitch to engine control unit
• Engine control unit terminal 1R malfunction
YES
2
Water thermoswitch circuit is OK
Disconnect a jumper wire