ABS Brake System Components and Locations
ABS Brake System Components and Locations
1 ASR/ESP Control Lamp (K155)
• Location in instrument cluster.
• Blinks when driving if ESP engages regularly.
• Comes on for function test after switching ignition on and goes out after driving a short distance.
• Comes on if there is an ESP system malfunction.
• Comes on if there is an ABS system malfunction because ESP and ABS work together.
• Comes on when ESP is switched off.
• Comes on during sensor adaptation process and goes out after driving a short distance
• If battery was disconnected and connected.
• Vehicle was started with jump start.
• Battery is very weak.
• If warning light comes on after starting engine, there is a system-directed shut down of the system In this case, ESP can be reactivated by switching ignition on and off.
2 ABS Warning Lamp (K47)
• Location in instrument cluster.
• Comes on for a few seconds after switching ignition on and then goes out after ABS system self-check if no malfunction was detected.
• There is an ABS system malfunction if:
• ABS system warning light does not come on when ignition is switched on.
• Warning light goes out again after a few seconds.
• Warning light comes on when driving.
• If there is a malfunction, vehicle can be braked normally without ABS.
• In case of a malfunction, ESP warning light comes on in addition to ABS warning light.
When ABS warning light and brake system warning light comes on, rear wheels may lock prematurely when braking.
3 Brake System Warning Lamp (K118)
• Location in instrument cluster.
• Blinks when there is a brake system malfunction.
• Blinks when there is an ABS system malfunction.
• Blinks when brake fluid level is too low.
4 ABS Hydraulic Unit (N55) with ABS Control Module (J104)
• With integrated brake pressure sensor.
• Brake pressure sensor in ABS Control Module J104 cannot be replaced.
• Disconnecting hydraulic unit - a - and control module - b - is not intended.
• Component location: in right plenum chamber below engine control module.
• Switch ignition off before separating connector.
5 Brake System Vacuum Pump (V192)
• Installation of vacuum pump depends on engine and transmission.
• Location in front right engine compartment.
• Vacuum pump is not intended to be serviced. If there is a malfunction in the pump, pump should be replaced.
• Removing and installing, refer to => [ Brake System Vacuum Pump ] Brake System Vacuum Pump.
• Vacuum pump malfunctions are stored in engine control module.
6 Brake Booster Pressure Sensor (G294)
• Installation of vacuum pump depends on engine and transmission.
• Location in vacuum hose to brake booster.
• Removing and installing, refer to => [ Brake Booster Pressure Sensor ] .
7 Brake Booster
• Removing and installing, refer to => [ Brake Booster ] Brake Booster.
8 Brake Master Cylinder
• Removing and installing, refer to => [ Brake Master Cylinder ] Brake Master Cylinder.
9 Brake Light Switch (F) and Brake Pedal Switch (F47)
• Removing and installing, refer to => [ Brake Light Switch ] .
• Component location: On brake pedal.
10 ESP-Sensor unit (G419)
• Combined Transverse Acceleration Sensor (G200), Rotation Rate Sensor (G202) and Longitudinal Acceleration Sensor (G251).
• Location under center console.
• Removing and installing, refer to => [ ESP Sensor Unit ] Service and Repair.
11 Steering Angle Sensor (G85)
• Location on steering column between steering wheel and steering column switch.
• Observe installation instructions. Refer to => [ Steering Angle Sensor ] Service and Repair.
12 ASR/ESP Button (E256)
• Located in the center console.
13 Right Front ABS Wheel Speed Sensor (G45)/ or Left Front ABS Wheel Speed Sensor (G47)
• Replacing, refer to => [ Front ABS Speed Sensor ] Front ABS Speed Sensor.
14 Front Right/Left Wheel Bearing/Wheel Hub Unit
• ABS sensor ring is installed in wheel bearing.
15 Right Rear ABS Wheel Speed Sensor (G44) or Left Rear ABS Wheel Speed Sensor (G46)
• Replacing, refer to => [ Rear ABS Speed Sensor ] Rear ABS Speed Sensor.
16 Rear Right/Left Wheel Bearing/Wheel Hub Unit
• ABS sensor ring is installed in wheel bearing.
17 Diagnostic Connection
• Location under driver side footwell cover.
18 Parking Brake Pedal
• Removing and installing, refer to => [ Pedal Parking Brake Lever ] .
Diagnostic Connection
