Power Relay Test

Use this chart to identify the type of relay, then do the test listed for it.
Relay
Test
Accessory power socket relay
Normally-open type
A/C compressor clutch relay
Blower motor relay
Cigarette lighter relay
Driver's seat heater relay (high)
ETCS control relay
Front passenger's seat heater relay (high)
Headlight washer relay
Horn relay
Ignition coil relay
PGM-FI main relay 1 (FI MAIN)
PGM-FI main relay 2 (FUEL PUMP)
PGM-FI subrelay
Radiator fan relay
Rear window defogger relay
Security horn relay
Starter cut relay
Driver's seat heater relay (low)
Five-terminal type
Front passenger's seat heater relay (low)
Left side super locking LOCK relay
Right side super locking LOCK relay
Super locking UNLOCK relay
Daytime running lights relay

Normally-open type
Check for continuity between the terminals:
  • There should be continuity between the No. 1 and No. 2 terminals when battery power is connected to the No. 4 terminal, and body ground is connected to the No. 3 terminal.
  • There should be no continuity between the No. 1 and No. 2 terminals when power is disconnected.