CM1-R-12V Micro-ISO Automotive Relay — 5-Pin SPDT, 12V, 35A (with Internal Resistor)Match by OE and footprint to restore reliable switching in fan, HVAC, lighting, and starter-control circuits. This 5-pin SPDT (1 Form C) Micro-ISO relay uses a 12V coil and integrates a resistor for coil suppression.
Coil Voltage: 12V DC (usable range 10–16V DC)
Contact Form: SPDT (1 Form C), 5 pins
Rated Switching (resistive): NO 35A @ 14V DC; NC 20A @ 14V DC
Operate Time (typical): ~10 ms; Non-latching; Sealed construction
Terminal Type: Plug-in Micro-ISO; Standard ISO numbering (30/87/87a/85/86)
Protective Element: Internal resistor (for coil transient suppression)
Typical Uses: Cooling fan, A/C clutch, blower, lighting, horn, starter control (per vehicle design)
Body Size (approx.): 20 × 15 × 22 mm
ACM13221 → CM1-R-12V product mapping (manufacturer reference)
MR515994 → Compatible with Mitsubishi applications that specify this OE relay (confirm by VIN/box legend)
Disconnect battery negative before service. Locate the under-hood fuse/relay box and identify the slot calling for a 5-pin SPDT Micro-ISO relay.
Verify pin count and layout: 30 (common), 87 (normally open), 87a (normally closed), 85/86 (coil).
Push to seat fully; do not force. Reconnect battery and test the controlled load (fan, A/C clutch, etc.).
Intermittent/no cooling-fan operation; A/C clutch not engaging
No-crank or sporadic starter-control (when used in that circuit)
Load cuts out after warm-up; relay clicking but no continuity
4-Pin SPST Micro-ISO (e.g., CM1A-R-12V / ACM33221) — use only if your slot requires 4 pins
Relay sockets/pigtails for Micro-ISO (if adding auxiliary circuits; verify wire gauge and rating)
Always confirm by OE number and pin configuration before purchase. This item is supplied as an aftermarket replacement and is not produced by the vehicle manufacturer.