Hyundai Palisade: Brake System / Stop Lamp Switch

Hyundai Palisade (LX2) 2020-2024 Service Manual / Brake System / Brake System / Stop Lamp Switch

Components and components location
Components

Hyundai Palisade. Components and components location

1. Brake member assembly
2. Stop lamp switch
 3. Brake pedal arm assembly
4. Brake pedal pad

Schematic diagrams
Schematic Diagram

Hyundai Palisade. Schematic diagrams

System circuit diagram

Hyundai Palisade. Schematic diagrams

Terminal Function

Hyundai Palisade. Schematic diagrams

Teminal
Description
1
 IGN1
2
 Engine Control Module (ECM)
3
 -
4
 B+
5
 Stop Lamp
6
 Gruound

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.
Confirm the gap between stop lamp switch and bracket.
Stop lamp clearance (A) : 1.0 - 2.0 mm (0.04 - 0.08 in.)

Hyundai Palisade. Repair procedures
4.
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.
5.
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.

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures

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.

Hyundai Palisade. Repair procedures
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]

Hyundai Palisade. Repair procedures

[ABS / VDC Control Module]

Hyundai Palisade. Repair procedures

4. Inspect The Stop Lamp Circuit
Connect probe to each terminal wire and confirm oscilloscope waveform.
[Stop Lamp Switch Input/ Output]

Hyundai Palisade. Repair procedures

[Oscilloscope Waveform Screen]

Hyundai Palisade. Repair procedures

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

Hyundai Palisade. Repair procedures
4.
Pull the locking plate (A) as indicated by the arrow.

Hyundai Palisade. Repair procedures
5.
Turn stop lamp switch (A) 45° counterclockwise and remove it.

Hyundai Palisade. Repair procedures
6.
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.

Hyundai Palisade. Repair procedures
(2)
Perform the inspection of parts resistance

Hyundai Palisade. Repair procedures

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.

Hyundai Palisade. Repair procedures
2.
After inserting, turn the stop switch (A) 45° clockwise, and then assemble locking plate by pushing.

Hyundai Palisade. Repair procedures
3.
Confirm the gap between stop lamp switch and bracket.
Stop lamp clearance (A) : 1.0 - 2.0 mm (0.04 - 0.08 in.)

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures   
•
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).

Hyundai Palisade. Repair procedures
5.
Install the lower crash pad.
(Refer to Body - "Crash Pad")
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

Hyundai Palisade. Troubleshooting

Hyundai Palisade. Troubleshooting

SSEM : Stop Signal Electronic Module
4.
Refer to DTC guide when the related DTC codes are displayed.

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