Starter Relay — OE 28300-16010 (Replaces 28300-24031 / Denso 056700-7400)
This is a 12V, 4-pin starter circuit relay used in the engine-bay fuse/relay box. Always confirm by OE number and the socket's pin layout before ordering. All vehicle names below are used strictly in a compatibility sense.
Key Specifications
Operating Voltage: 12 V DC
Pins / Footprint: 4-pin, mini ISO-style footprint (verify against your fuse-box socket)
Primary OE Reference: 28300-16010
Supersession: 28300-24031
Manufacturer Pattern Reference: Denso 056700-7400
Cross-References (for search/verification only)
Denso 567-0021
WVE/Wells 1R1227
Airtex 1R1227
BWD R3054
NAPA Echlin AR355
What It Does
The starter relay switches battery power to the starter solenoid when the ignition key is in START. A failing relay can cause intermittent or complete “no-crank” conditions. Some vehicles may log a starter relay circuit fault (e.g., P0615). Always check wiring, grounds, and the relay socket condition during diagnosis.
Typical Location
Engine-bay fuse/relay box (location names vary by model/year). Match the cavity label and pin layout.
Fitment by Year (match by OE first)
Compatible with Toyota Camry: 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994
Compatible with Toyota 4Runner: 1989, 1990, 1991, 1992
Compatible with Toyota Celica: 1986, 1987, 1988, 1989
Compatible with Toyota Corolla: 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
Compatible with Lexus LS400: 1990, 1991, 1992, 1993, 1994
Compatible with Lexus ES250: 1990, 1991
Compatible with Lexus ES300: 1992, 1993, 1994
Compatible with Lexus GS300: 1993, 1994, 1995, 1996, 1997
Additional catalog examples: Compatible with Toyota Corolla FX, Compatible with Toyota Cressida, Compatible with Toyota MR2, Compatible with Toyota Previa, Compatible with Toyota Supra, Compatible with Toyota Tercel (confirm relay cavity and OE before purchase)
Installation Notes
Disconnect the negative battery terminal.
Open the engine-bay fuse/relay box and identify the starter relay cavity.
Pull the old relay straight up. Inspect terminals for heat damage or corrosion.
Seat the new relay firmly; ensure full engagement with the socket.
Reconnect the battery and verify proper crank operation.
Symptoms of a Faulty Relay
No crank with normal dash lights
Intermittent starting (taps/temperature affect operation)
Clicking from relay area without starter engagement
Burnt/melted relay socket or discolored terminals
Complementary Items (often replaced together)
Starter motor / starter solenoid assembly
Ignition switch
Battery cables and ground straps
Relay-socket pigtail/repair leads (if terminals are heat-stressed)
What's Included
1 × Starter relay (pattern replacement for OE 28300-16010)
All vehicle names are used strictly in a compatibility sense. Always confirm by OE number, pin layout, and fuse-box position before ordering.