Package: 1 piece coffee brown 12V plug-in relay.
Main part number: 13306940.
Verified replacement-chain ID: 84749906.
Visible layout: 5 terminals marked 85, 86, 30, 87 and 87b; double-make / Form-U style with resistor symbol R1.
Common catalog descriptions: main wiring junction and fuse block relay, rear window defogger relay, accessory power relay, body multiuse relay, engine-compartment fuse & relay box relay.
Match the original relay number to 13306940 or verified replacement-chain ID 84749906.
Match the 12V coffee/brown housing, 5-pin terminal pattern and 87/87b double-make layout. Do not use as a 87a changeover relay.
Confirm the exact fuse box slot and circuit by VIN, fuse box diagram, service manual or original relay markings before purchase.
Compatible with Buick Cascada 2016-2019, Buick Envision 2016-2019 and Buick Verano 2012-2015 applications using OE 13306940 / 84749906.
Compatible with Cadillac ATS 2013-2019, CTS 2014-2019, ELR 2014-2015 and SRX 2012-2013 applications using OE 13306940 / 84749906.
Compatible with Chevrolet Camaro 2018-2019, Corvette 2014-2019, Equinox 2018-2019 and 2023-2024, and Volt 2011-2015 applications using OE 13306940 / 84749906.
Compatible with GMC Terrain 2018-2020 and 2023-2024 applications using OE 13306940; also verify 2018-2024 GMC Terrain applications by replacement-chain ID 84749906 and original relay layout.
Fitment is not universal. Listed years/models may still vary by engine, trim, fuse box design and circuit option.
Disconnect power before service. Pull the old relay straight out and avoid prying hard against the fuse box.
Inspect the relay socket for heat damage, corrosion, moisture or loose terminals before installing the replacement.
If the original relay has a different terminal count, 87a layout, voltage marking, body size or fuse-box legend, do not install this part.
Is 84749906 in the same replacement chain? Dealer catalog sources list 13306940 as replaced by 84749906 and 84749906 as replacing 13306940.
Can this replace any 5-pin relay? No. It must match the 85/86/30/87/87b double-make layout and the original part number or fuse-box listing.
What symptoms may relate to a failed relay? A failed relay can cause related rear defogger or accessory-power circuit issues, but diagnosis should confirm relay failure before replacement.