Kia Niro: AHB(Active Hydraulic Boost) System / Stop Lamp Switch Repair procedures

Kia Niro 2017 (DE HEV) Service Manual / Brake System / AHB(Active Hydraulic Boost) System / Stop Lamp Switch Repair procedures

Removal

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

2.	Remove the crash pad lower panel. (Refer to Body - "Crash Pad")

3.	Remove the knee air bag. (Refer to Restraint - "Knee Airbag(KAB) Module")

4.	Disconnect the stop lam switch connector (A).

5.	Pull the locking plate (A) as indicated by the arrow.

6.	Turn brake switch 45° counterclockwise and remove it.

Inspect a removed stop lamp switch along the below procedures.

(1)

Confirm a normal connection with terminal part

–	A confirmation can be made to see if the connector has been secured properly and if a connection mark is present.

(2)

Perform the inspection of parts resistance.

Resistance (?)	.3-4	.1-2
Plunger depressed (switch turned OFF)	Infinite	0
Plunger released (switch turned ON)	0	Infinite

Installation

1.	Fix the brake pedal arm and insert fully the stop lamp switch as hiding contact part.

2.	After inserting, turn the stop switch 45° clockwise, and then assemble locking plate by pushing.

Confirm the gap (A) between stop lamp switch and bracket.

Stop lamp clearance :

1.0 - 2.0 mm (0.04 - 0.08 in.)

If the gap between stop lamp switch and bracket is not 1.0 - 2.0 mm(0.04 - 0.08in), perform the above process again.

4.	Connect the stop lamp switch connector.

5.	Install the knee air bag. (Refer to Restraint - "Knee Airbag (KAB) Module")

6.	Install the lower crash pad. (Refer to Body - "Crash Pad")

Inspection

1. Fuse inspection

Mount the test fuse to the switch fuse and relay fuse part to confirm a normal joint fit.

2. GDS Data Analysis

Analyze GDS data and confirm if there is anything wrong with the stop lamp switch.

(1)	Connect the GDS to the self-diagnosis connector.

(2)	Turn the spark switch on

(3)	Step on the brake pedal.

(4)

Inspect the "brake switch" category that displays the "sensor data" GDS.)

Normal waveform : The pressure sensor signal value will change according to the brake ON/OFF switch.

3. Inspection of connector by each part

Check to see whether or not each connector has been damaged, or terminal surge, or incomplete connection has taken place

[Engine room junction box]

[ABS/VDC control module]

4. Inspect the stop lamp circuit

Connect probe to each terminal wire and confirm oscilloscope waveform.

[Stop lamp switch input/output]

[Oscilloscope waveform screen]

Stop Lamp Switch Troubleshooting

Troubleshooting 1. Part diagnosis Items Cause Symptom Switch fuse ...

Parking Brake System

...

Other information:

Kia Niro 2017 (DE HEV) Service Manual: Motor Control Unit(MCU) Components and components location
Components Location 1. HPCU assembly ...

Kia Niro 2017 (DE HEV) Service Manual: Coolant Repair procedures
Refilling And Bleeding Never remove the radiator cap when the engine is hot. Serious scalding could be caused by hot fluid under high pressure escaping from the radiator. ...