Hyundai Ioniq: AHB(Active Hydraulic Boost) System / Schematic diagrams

Hyundai Ioniq (AE) 2017-2025 Service Manual / Brake System / AHB(Active Hydraulic Boost) System / Schematic diagrams

Terminal Function

IBAU Connector Input / Output

No	Description	No	Description
1	E/R Fuse & Relay Box (Multi Fuse - AHB)	24	Electric Parking Brake Switch (Auto Hold Swutch)
2	PSU Motor (+)	25	-
3	-	26	Parking Brake Switch
4	Shield Cable Ground	27	Rear Wheel Sensor LH (SIG)
5	E/R Fuse & Relay Box PSU Motor (GND)	28	Front Wheel Sensor LH (SIG)
6	Brake Pedal Module (PDT PWR)	29	Driver Door Switch
7	Brake Pedal Module (PDF PWR)	30	E/R Fuse & Relay Box (Multi Fuse - AHB 2)
8	E/R Fuse & Relay Box (Stop Signal Electronic Module)	31	Brake Pedal Module (PDF GND)
9	-	32	-
10	Brake Pedal Module (PDT GND)	33	Rear Wheel Sensor LH (VCC)
11	Shield Cable Ground	34	Rear Wheel Sensor RH (VCC)
12	-	35	-
13	PSU Motor (-)	36	Brake light switch
14	Ground	37	-
15	-	38	C-CAN (High)
16	Crash Pad Switch (ESC OFF Switch)	39	C-CAN (Low)
17	Front Wheel Sensor LH (VCC)	40	Vehicle Speed : Smart Key Control Module, PCM
18	Front Wheel Sensor RH (VCC)	41	-
19	P-CAN (High)	42	Front Wheel Sensor RH (SIG)
20	P-CAN (Low)	43	Rear Wheel Sensor RH (SIG)
21	ESS Drive	44	Stop Lamp Switch
22	Brake Pedal Module (PDT SIG)	45	-
23	Brake Pedal Module (PDF SIG)	46	Ground (GE06)

Components and components location

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Repair procedures

AHB Brake System Bleeding ProcedureAir Bleeding Tool Installation Procedure • To prevent the brake fluid reservoir tank from beingdamaged and ensure the safety of worker, set thepressure of the gauge to the standard value beforeinstalling the SST...

Other information:

Hyundai Ioniq (AE) 2017-2025 Service Manual: Components and components location

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Hyundai Ioniq (AE) 2017-2025 Owner's Manual: Hybrid battery SOC (State of Charge) gauge

This gauge indicates the remaining hybrid battery power. If the SOC is near the "L (Low)" level, the vehicle automatically operates the engine to charge the battery. However, if the Service Indicator () and Malfunction Indicator Lamp (MIL) () turn on when the SOC gauge is near the "L (Low)" level, have the vehicle be checked by an authorized HYUNDAI dealer...