Kia Niro: 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.

7.

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.

3.

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

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.

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 ...

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