Section 486 (Air Conditioning): Relay: Inspection

WARNING: This page is about a different car, the 2005 Lexus GS 430 and 2005 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HEATER MAIN RELAY (Marking: HTR) CONTINUITY

Fig 1: Identifying Heater Main Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

MAIN RELAY CONTINUITY

Condition	Tester connection	Specified condition
Constant	2 - 4	Continuity
Constant	1 - 3	Continuity
Apply B+ between terminals 1 and 3.	5 - 4	Continuity

If continuity is not as specified, replace the relay.

INSPECT MAGNETIC CLUTCH RELAY (Marking: A/C COMP) CONTINUITY

Fig 2: Identifying Magnetic Clutch Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CLUTCH REPLAY CONTINUITY

Condition	Tester connection	Specified condition
Constant	1 - 2	Continuity
Apply B+ between terminals 1 and 2.	3 - 5	Continuity

If continuity is not as specified, replace the relay.

INSPECT No.2 COOLING FAN RELAY (Marking: FAN NO.2) CONTINUITY

Fig 3: Identifying No-2 Cooling Fan Relay Connector Terminals

FAN RELAY CONTINUITY

Condition	Tester connection	Specified condition
Constant	1 - 2	Continuity
Constant	3 - 4	Continuity
Apply B+ between terminals 1 and 2.	3 - 5	Continuity

If continuity is not as specified, replace the relay.

INSPECT No.3 COOLING FAN RELAY (Marking: FAN NO.3) CONTINUITY
Check the relay in the same way as for "MAGNETIC CLUTCH RELAY".