Stop Lamp Switch

Components and Component Location

Components

1. Brake Pedal Assembly 2. Stop Lamp Switch

3. Brake Pedal Lever Assembly 4. Brake Pedal Pad

Circuit Diagrams

Schematic Diagram

System Diagram

Terminal Function

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

Repair Procedures

Adjustment

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery cable.
2. 2
   Remove the lower under cover. (Refer to Body - Under Cover)
3. 3
   Check the clearance between the stop lamp switch and the bracket.

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

   

4. 4
   If the clearance between the brake light switch and the bracket is not 1.0–2.0 mm (0.04–0.08 in.), check the mounting clip and other parts around the brake light switch.
5. 5
   If everything is normal, remove the stop lamp switch and install it again.

Inspection

1. Check Fuses. Install a test fuse on the brake switch fuse and the relay fuse part to confirm normal operation of the joint.

2. GDS Data Analysis

1. Analyze the GDS data and confirm that there is a problem with the brake light switch.
   1. Connect the GDS to the self-diagnosis connector.
   2. Turn the ignition switch ON.
   3. Press the brake pedal.
   4. Inspect the "brake switch" category displayed in the GDS "Sensor Data". Normal signal pattern: the pressure sensor signal value changes according to the brake switch ON/OFF state.

      

3. Check Connector Check each connector for damage, terminal overtightening, or incomplete connection. [Engine Compartment Junction Block]

[ABS/VDC Control Module]

4. Inspect the brake light circuit. Connect the probe to each terminal wire and check the signal waveform. [Brake Light Switch Input/Output]

[Oscilloscope Waveform Screen]

Removal

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery cable.
2. 2
   Remove the lower under cover. (Refer to Body - Under Cover)
3. 3
   Disconnect the stop lamp switch connector (A).

   

4. 4
   Pull the lock plate (A) as shown by the arrow.

   

5. 5
   Turn the brake light switch (A) 45° counterclockwise and remove it.

   

6. 6
   Inspect the removed stop lamp switch according to the procedures described below.

   1. Confirm proper connection with the terminal part. Check whether the connector is properly secured and the connection mark is present.

      

   2. Perform resistance inspection of the part.

      

      Resistance (Ω)	3-4	1-2
      Plunger not protruding (switch OFF)	Infinity	0
      Plunger protruding (switch ON)	0	Infinity

Installation

1. 1
   Hold the brake pedal arm and fully insert the brake light switch so that the contact part is hidden.

   

2. 2
   After inserting, turn the stop switch (A) 45° clockwise, then engage the locking plate by pressing.

   

3. 3
   Check the clearance between the stop lamp switch and the bracket.

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

   

   If the clearance between the brake light switch and the bracket is not 1.0–2.0 mm (0.04–0.08 in.), repeat the above process.

4. 4
   Connect the connector of the brake light switch (A).

   

5. 5
   Install the lower under cover. (Refer to Body - Under Cover)

Troubleshooting

Troubleshooting

1. 1
   Component Inspection

   Items	Cause	Symptom
   Fuse Switch	Loose fuse connection, blown fuse	DTC: P0504 Symptom: Shift problems, start failure, cruise control cancel function problem, EPB cancel function malfunction, brake light malfunction, ESP OFF lamp ON.	① Check the signal waveform using an oscilloscope on each part while the vehicle is accelerating/braking. (Refer to Brake Light Switch Circuit Inspection Procedure) ② Refer to the applicable part repair procedure if any abnormality is found in the waveform (refer to the repair procedure for the relevant part and replace if necessary)
   Fuse Relay	Loose fuse connection, blown fuse	DTC: P0504 Symptom: Shift problems, no-start, cruise control cancel problem, EPB release function malfunction, brake light malfunction, ESP OFF indicator illuminated.
   Stop Lamp Switch	Damaged wiring of each component Incorrect connector connection Faulty component	DTC: P0504 Symptom: Shift problems, no-start, cruise control cancel problem, EPB release function malfunction, brake light malfunction, ESP OFF indicator illuminated.
   Electronic Brake Light Module (if equipped)		DTC: P0504, C2130, C2131 Symptom: Shift problems, no-start, cruise control cancel problem, EPB release function malfunction, brake light malfunction, ESP OFF indicator illuminated.
   Engine Control Module (ECM)		DTC: P0504 Symptom: Shift problems, cruise control cancel problem
   Body Control Module (BCM)		Gear Shifting Concerns
   Shift Lock Solenoid		Gear Shifting Concerns
   Inhibitor Switch		Symptom: Shift problems, no-start, cruise control cancel problem, EPB release function problem
   Smart Key Unit (SMK)		Starting Failure
   Electronic Parking Brake (EPB)		Symptom: EPB release function problem, ESP OFF indicator illuminated.
   ABS/VDC Control Module (Pressure Sensor)		Symptom: ESP OFF lamp illuminated.

2. 2
   Symptom Diagnostics

   Symptom	Possible Cause
   Starting Problems	Switch fuse, relay fuse, brake light switch, electronic brake light module, ABS/VDC control module, each wire, connector	① Check the signal waveform using an oscilloscope on each part while the vehicle is accelerating/braking. (Refer to Brake Light Switch Circuit Inspection Procedure) ② Refer to the applicable part repair procedure if any abnormality is found in the waveform (refer to the repair procedure for the relevant part and replace if necessary)
   Gear Shifting Concerns	Switch fuse, relay fuse, brake light switch, electronic brake light module, BCM, ECM, inhibitor switch, each wire, connector
   ESP OFF indicator light is on	Switch fuse, relay fuse, brake light switch, electronic brake light module, ABS/VDC control module, each wire, connector
   P0504	Switch fuse, relay fuse, brake light switch, electronic brake light module, ECM, each wire, connector
   Stop lamp does not work	Switch fuse, relay fuse, brake light switch, electronic brake light module, wire/connector disconnected
   Brake light always ON	Brake light switch, electronic brake light module, wiring short circuit, blown fuse

3. 3
   Stop Lamp Switch System Diagnosis

   

   

   SSEM: Stop Lamp Electronic Module
4. 4
   Refer to the DTC Chart when the applicable DTCs are displayed.