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Components and Components Location: Component

WARNING: This page is about a different car, the 2016 Hyundai Elantra GT and 2015 Hyundai Elantra GT. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Smart Key Unit Connectors End View
G10751380Courtesy of HYUNDAI MOTOR AMERICA
CONNECTOR PIN INFORMATION

No. Connector A (26 pins) No. Connector B (16 pins) No. Connector C (22 pins)
1 Battery power load 1 CAN Low 1 SSB illumination ground
2 - 2 CAN High 2 Immobilizer indicator
3 Power ground1 3 - 3 SSB LED OFF
4 Ignition1 4 Stop lamp fuse 4 Interior antenna #2 power
5 Ignition1 relay 5 Brake switch 5 Interior antenna #1 power
6 ACC 6 Immobilizer antenna power 6 -
7 Ignition2 7 - 7 -
8 SSB switch2 8 Wheel speed 8 Trunk antenna power
9 - 9 Driver toggle button 9 Bumper antenna power
10 - 10 - 10 Assistant side antenna power
11 - 11 External buzzer 11 Driver side antenna power
12 CAN High 12 P position/Clutch switch 12 SSB LED blue/SSB LED ignition
13 CAN Low 13 Start feedback 13 SSB illumination power
14 Battery voltage CPU 14 Immobilizer antenna ground 14 Key Out indicator
15 - 15 Diagnostic - K 15 Interior antenna #2 ground
16 Power ground2 16 SSB LED amber/SSB LED ACC 16 Interior antenna #1 ground
17 Starter relay   17 -
18 Ignition2 relay 18 -
19 ACC relay 19 Trunk antenna ground
20 - 20 Bumper antenna ground
21 - 21 Assistant side antenna ground
22 - 22 Driver side antenna ground
23 RPM  
24 EMS COM
25 SSB switch1
26 Assistant toggle button