Hyundai Tucson (NX4) 2022-2025 Service Manual / Engine Electrical System / Charging System / DC DC converter

Hyundai Tucson: Charging System / DC DC converter

- Description Due to the considerably more frequent occurrence of starting operations, the electrical load that occurs often leads to voltage dips in the vehicle network.In order to stabilize the power supply for certain voltage-sensitive electrical components, a DC/DC converter is used in conjunction with the ISG function.The DC DC converter supplies the relay with a voltage that also remains constant during the starting operation.The DC/DC converter is fitted at the behind of the glove box.Via the test leads for input voltage and the start relay , the electronics decide whether the power is supplied to the output via the bypass or the DC/DC converter.In the bypass mode, the on-board supply voltage is not fed across the DC/DC converter, rather is transferred directly to the outputs. In the booster phase, the vehicle voltage is adapted.

- Components Location

1. DC/DC Converter [200W]
2. DC/DC Converter [450W]

- Specifications [200W]

Type		Specifications
Switching mode	Input voltage range	7 - 16
	Battery powered (B+) output voltage	11.4 - 12.6 [Max 13A, Max power 200W]
	ACC output voltage	11 - 13 [Max 3A]
	Time (sec)	Max 1

[450W]

Type		Specifications
Switching mode	Input voltage range	7 - 16
	Battery powered (B+) output voltage	11.4 - 12.6 [Max 26A, Max power 450W]
	ACC output voltage	11 - 13 [Max 3A]
	Time (sec)	Max 1

- Circuit Diagram [200W]

[450W]

- Terminal Function [200W]

Pin	Description	Pin	Description
1	Battery power (B+) input	7	ISG signal input
2	-	8	ACC input
3	-	9	ACC output
4	Battery power (B+) output	10	Ground
5	-	11	-
6	IGN1 input

[450W]

PIn	Description	PIn	Description
1	Ground	6	IGN1 input
2	Ground	7	ISG signal input
3	Battery power (B+) output [100W]	8	ACC input
4	Battery power (B+) input	9	ACC output
5	Battery power (B+) input [Current Cut Off]	10	Battery power (B+) output [AMP]

- Removal

1.Turn the ignition switch OFF and disconnect the battery (-) terminal.

2.Remove the main crash pad assembly.(Refer to Body (Interior and Exterior) - "Main Crash Pad Assembly")

3.Remove the DC/DC converter mounting nut (A).

Tightening torque :6.6 - 9.9 N.m (0.67 - 1.01 kgf.m, 4.8 - 7.3 Ib-ft)

4.Remove the DC/DC converter mounting screw (A).

Tightening torque :4.3 - 6.4 N.m (0.44 - 0.65 kgf.m, 3.2 - 4.7 Ib-ft)

5.Disconnect the DC/DC converter connector (A).

6.Remove the DC/DC converter (B).

- Installation

• After reconnecting the battery negative cable, ISG function does not operates until the system is stabilized, about 4 hours. If disconnecting the negative (-) battery cable from the battery during repair work for the vehicle equipped with AMS function, Battery sensor recalibration procedure should be performed after finishing the repair work.

1.Install in the reverse order of removal.

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