Kia Niro: AHB(Active Hydraulic Boost) System / Stop Lamp Switch 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.

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

? 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
? Inspect waveform using an oscilloscope on each part during vehicle acceleration/braking. (Refer to stop lamp switch circuit inspection Procedures)

? 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.

Stop Lamp Switch Schematic diagrams
Schematic Diagram System circuit diagram Terminal function Teminal Description 1 IGN1 ...

Stop Lamp Switch Repair procedures
Removal 1. Turn ignition switch OFF and disconnect the negative (-) battery terminal. 2. Remove the crash pad lower panel. (Refer to Body - ...

Other information:

Kia Niro 2017 (DE HEV) Service Manual: Main Crash Pad Assembly Components and components location
Component Location 1. Crash pad main lower panel ...

Kia Niro 2017 (DE HEV) Service Manual: High voltage shut-off procedures
High Voltage Shut-off Procedures    • Be sure to read and follow the “General Safety Information and Caution” before doing any work related with the high voltage system. Failure t ...

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