Hyundai Creta: Brake System / Stop Lamp Switch

Components and components location

Components Location

1.Stop lamp switch
2. Nut
3. Return spring
4. Brake pedal member assembly
5. Bolt
6. Brake pedal arm

Description and operation

Description
The stop lamp switch plays the role of supplying signals to turn on stop lamps and convenience devices (HECU,ECU,BCM,SMK etc.) for drivers as a system that expresses the driver's intentions to brake by pressing the brake pedal.

Schematic diagrams

Schematic Diagram

System circuit diagram

Terminal function

Teminal
Description
1
IGN1
2
Engine Control Module (ECM)
3
B+
4
Stop Lmap

Troubleshooting

Troubleshooting
1.
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.

2.
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 does notworking
Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, Wire/Connector disconnected
Stop lamp always
turns 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
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the lower crash pad.
(Refer to Body - "Crash Pad")
3.
Remove the knee airbag.
(Refer to Rstraint - "Air Bag Module")
4.
Confirm the gap between stop lamp switch and bracket.
Stop lamp clearance : 1.0 ~ 2.0 mm (0.04~ 0.08 in.)

5.
If the gap between stop lamp switch and bracket is not 1.0~2.0mm(0.04~0.08in), check the mounting clip and other part of around stop lamp.
6.
If there is 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.

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]

[Stop signal electronic module]

[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]

[Stop signal electronic module input/output]

[Oscilloscope waveform screen]

Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the lower crash pad.
(Refer to Body - "Crash Pad")
3.
Remove the knee airbag.
(Refer to Rstraint - "Air Bag Module")
4.
Disconnect the stop lamp switch connector (A).

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

6.
Turn stop lamp 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 (Ω)
3-4
1-2
Non rod protruded
(switch turned OFF)
Infinite
0
Rod protruded
(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 (A) 45° clockwise, and then assemble locking plate (B) by pushing.

3.
Confirm the gap 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 1.0~2.0mm(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")
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