2. Inspect Engine Room No. 3 Relay Block Circuit

WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Engine Room No. 3 Relay Block Circuit

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Remove the relay from the relay block and inspect the connector on relay block side.

SPECIFIED CONDITION

Fuse	Tester connection	Condition	Specified condition
FAN NO.1	3-Ground	Ignition switch ON	Battery positive voltage
FAN NO.2	8-Ground	Ignition switch ON	Battery positive voltage
A/C COMP	13-Ground	Ignition switch ON	Battery positive voltage
FAN NO.3	17-Ground	Ignition switch ON	Battery positive voltage
DIMMER	20-Ground	Constant	Battery positive voltage

If the circuit is not as specified, inspect the circuits connected to other parts.