Kia Rio: Brake System / Stop Lamp Switch

Kia Rio 2017-2020 YB Service Manual / Brake System / Brake System / Stop Lamp Switch

Components and components location

Components

1. Brake pedal member assembly
2. Stop lamp switch

3. Brake pedal arm

Schematic diagrams

Schematic Diagram

System circuit diagram

Terminal function

Terminal	Description
1	IGN1
2	Engine Control Module (ECM)
3	B+
4	Stop Lamp

Troubleshooting

Part diagnosis

Items

Cause

Symptom

Switch fuse

Faulty fuse connection, Damaged fuse

–	DTC Code : P0504

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble, ESP OFF light illuminated.

① A waveform inspection is performed using an oscilloscope on each part during vehicle acceleration/braking. (Refer to stop lamp switch circuit inspection procedures)

② Refer to the relevant repair procedures of the part when something abnormal is discovered in the waveform (Refer to the repair procedures of the relevant part and if necessary replace it)

Relay fuse

Faulty fuse connection, Damaged fuse

–	DTC Code : P0504

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble , ESP OFF light illuminated.

Stop lamp switch

•	Damaged wiring of each part

•	Faulty connection to connector

•	Each part is defective

–	DTC Code : P0504

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble , ESP OFF light illuminated.

Stop signal electronic
module (If it applies)

–	DTC Code : P0504, C2130, C2131

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble , ESP OFF light illuminated.

Engine control module(ECM)

–	DTC Code : P0504

–	Symptom :Shifting gear trouble,Cruise control function cancelation trouble

Body control module (BCM)

–	Shifting gear trouble

Shift-lock solenoid

–	Shifting gear trouble

Inhibitor switch

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble

Smart Key Unit(SMK)

–	Starting failure

Electronic parking brake

–	Symptom : EPB function cancelation trouble , ESP OFF light illuminated.

ABS/VDC control module
(Pressure sensor)

–	Symptom : ESP OFF light illuminated.

Symptom diagnosis

Symptom	Part that could be the cause
Trouble starting	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, ABS/VDC control module, Each wire, Connector	① Inspect waveform using an oscilloscope on each part during vehicle acceleration/braking. (Refer to stop lamp switch circuit inspection Procedures) ② Refer to the relevant repair procedures of the part when something abnormal is discovered in the waveform (Refer to the repair procedures of the relevant part and if necessary replace it)
Trouble shifting gears	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, BCM, ECM, Inhibitor switch, Each wire, Connector
ESP OFF light illuminated	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, ABS/VDC control module, Each wire, Connector
P0504	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, ECM, Each wire, Connector
Stop lamp not working	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, Wire/Connector disconnected
Stop lamp always turned on	Stop lamp switch, Stop signal electronic module, Wiring short circuit, Damaged fuse

3.	Stop lamp switch system diagnosis SSEM : Stop Signal Electronic Module

4.	Refer to DTC guide when the related DTC codes are displayed.

Repair procedures

Adjustment

Confirm the gap between stop lamp switch and bracket.

Stop lamp clearancee (A) :

1.0 - 2.0 mm (0.04 - 0.08 in.)

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

3.	If everything is normal, reinstall the stop lamp switch and check the clearance again.

Inspection

Check the stop lamp switch.

(1)	Connect a circuit tester to the connector of stop lamp switch, and check whether or not there is continuity when the plunger of the stop lamp switch is pushed in and when it is released.

(2)	The stop lamp switch is in good condition if there is no continuity when plunger is pushed.

Replacement

1.	Switch "OFF" ignition and disconnect the negative (-) battery terminal.

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

3.	Disconnect the brake lamp switch connector (A).

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

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

6.	Fix the brake pedal arm and insert fully the brake switch so that the contact part is invisible.

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

8.	Connect the brake lamp switch connector (A).

9.	Install the crash pad lower panel. (Refer to Body - "Crash Pad Lower Panel")

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