Kia Optima: Body Electrical System / Multifunction Switch

Kia Optima DL3 2019-2025 Service and Repair Manual / Body Electrical System / Multifunction Switch

Specifications

Items		Specifications
Rated voltage	Front fog lamp switch	5 V
	Lighting
	Auto lighting
	Dimmer & Passing
	Turn signal lamp
	Wiper
	Washer	14.5 V

Schematic diagrams

Connector and Terminal Function

Connector A

Pin	Standard	R-MDPS
1	-	-
2	Headlamp low back up signal	Headlamp low back up signal
3	Front wiper INT volume signal	-
4	Ground	-
5	Ground (IBU)	Ground
6	Front wiper switch signal	-
7	Front wiper low back up signal	Front wiper low back up signal
8	IGN2	IGN2
9	Front washer motor switch power	Front washer motor switch power
10	Light switch signal	C-CAN (High)
11	-	C-CAN (Low)
12	Fog lamp switch signal	IGN1
13	Headlamp passing/high beam switch signal	-
14	Turn signal switch (LH)	B-CAN (High)
15	Turn signal switch (RH)	B-CAN (Low)
16	-	Battery (+)

Repair procedures

Removal

1.	Disconnect the negative battery terminal.

2.	Remove the steering column upper and lower shrouds. (Refer to Body - "Steering Column Shroud Panel")

3.	Remove the steering wheel. (Refer to Steering System - "Steering Wheel")

4.	Disconnect the all connector (A) from the multifunction switch.

Remove the multifunction switch (B) by loosening the mounting bolt (A).

Tightening torque :

7.8 - 8.8 N·m (0.8 - 0.9 Kgf·m, 5.8 - 6.5 lb·ft)

When install the multifunction switch, unscrew and reassemble the clamp bolt (A) to check for sound.

Installation

1.	Install in the reverse order of removal.

Inspection

Multifunction Switch Inspection

1.	Disconnect the negative battery terminal.

2.	Remove the steering column upper and lower shrouds. (Refer to Body - "Steering Column Shroud Panel")

Check for continuity between the terminals in each switch position as shown below.

Switch	Switch position	Switch terminal	Resistance (Ω, ±3.5%)
Front wiper switch	MIST	6-4	330
	OFF		∞
	INT (AUTO)		800
	LOW		1800
	HIGH		5700
Wiper intermittent volume	Volume 1	3-4	330
	Volume 2		690
	Volume 3		1310
	Volume 4		2610
	Volume 5		7310
Fog lamp switch	OFF	12-4	∞
	Front		910
	Rear		2910
Turn signal switch (Left)	OFF	14-4	∞
	Lanechange		910
	Full turn		2910
Turn signal switch (Right)	OFF	15-4	∞
	Lanechange		910
	Full turn		2910
Dimmer & Passing switch	OFF	13-4	∞
	Passing		910
	Dimmer		2910
Light switch	OFF	10-4	680
	AUTO		∞
	Tail lamp		1680
	Low beam		5580

Diagnosis With KDS

In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (KDS).

The diagnostic system (KDS) provides the following information.

(1)	Self diagnosis : Checking failure and code number (DTC)

(2)	Current data : Checking the system input/output data state

(3)	Actuation test : Checking the system operation condition

(4)	Additional function : Controlling other features including system option setting and zero point adjustment

Select the "Car model" and the 'IBU-BCM' to be checked in order to check the vehicle with the tester.

–	Standard : BCM - MFSW

–	R-MDPS : BCM - MFSW (DN8)

3.	Select the 'Current Data' menu to search the current state of the input/output data.

4.	To force actuate the input value of the module to be checked, select option 'Actuation Test'.

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