Problem Symptoms Table

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

PROBLEM SYMPTOMS TABLE - COOLING SYSTEM

Symptom

Suspected Area

Cooling fan is malfunctioning

Cooling fan motor(s)
Cooling fan ECU⁽¹⁾,⁽²⁾
Wire harness (ECM (RFC) to cooling fan ECU (SI)) ⁽³⁾
Wire harness (Power distributor (FCL) to cooling fan ECU (+B))
Wire harness (Power distributor (FCB) to cooling fan fuse) ⁽⁴⁾

⁽¹⁾	Terminal SI of the cooling fan ECU is faulty, inspect the wire harness.

⁽²⁾	Terminal +B of the cooling fan ECU is faulty, inspect the wire harness.

⁽³⁾	If the wire harness is normal, replace the ECM.

⁽⁴⁾	If the wire harness is normal, inspect the power distributor (See INSPECTION).