Kia Sorento: Stop Lamp Switch Repair procedures

Kia Sorento (MQ4, 2021-2026) Service Manual / Brake System / Brake System / Stop Lamp Switch Repair procedures

Adjustment

1.	Disconnect the (-) battery terminal.

Confirm the gap between stop lamp switch and bracket.

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

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Adjustment illustration

3.	If the gap between stop lamp switch and bracket is not 1.0 - 2.0 mm (0.04 - 0.08 in), check the mounting clip and other part of around stop lamp.

4.	If is not normal, remove the stop lamp switch and then install again.

Inspection

1. Fuse Inspection

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

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Inspection illustration

2. KDS Data Analysis

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

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

(2)	Turn the ignition ON.

(3)	Step on the brake pedal.

(4)

Inspect the "brake switch" category that displays the "sensor data" KDS.

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

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Inspection illustration

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]

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Inspection illustration

[ABS / ESC Control Module]

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Inspection illustration

4. Inspect the Stop Lamp Circuit

Connect probe to each terminal wire and confirm oscilloscope waveform.

[Stop Lamp Switch Input / Output]

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Inspection illustration

[Oscilloscope Waveform Screen]

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Inspection illustration

Removal

1.	Disconnect the (-) battery terminal.

2.	Disconnect the stop lamp switch connector (A).

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

4.	Turn stop lamp switch (A) 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.

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 (A) 45° clockwise, and then assemble locking plate by pushing.

Confirm the gap between stop lamp switch and bracket.

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

Brake System — Brake System / Stop Lamp Switch / Repair procedures / Installation illustration

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

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

5.	Connect the (-) battery terminal.

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Kia Sorento: Stop Lamp Switch Repair procedures

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