KIA Niro: Stop Lamp Switch Repair procedures

Kia Niro - First generation - (DE) (2017-2022) - Service and Repair 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).

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

  1. Turn brake switch 45º counterclockwise and remove it.

  1. 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.

Installation

Installation

  1. Insert fully the stop lamp switch as hiding contact part and than turn the stop lamp switch 45º clockwise.

  1. Assemble locking plate (A) by pushing.

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

Stop lamp clearance : 1.0 - 2.0 mm (0.04 - 0.08 in.)

Warning

Warning

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.

  1. Connect the stop lamp switch connector (A).

  1. Install the knee air bag.

    (Refer to Restraint - "Knee Airbag (KAB) Module")

  2. 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.

  1. GDS Data Analysis
  1. 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.

  1. 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

ABS/VDC control module

  1. Inspect the stop lamp circuit

Connect probe to each terminal wire and confirm oscilloscope waveform.

Stop lamp switch input/output

Oscilloscope waveform screen

Oscilloscope waveform screen

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