Component Inspection

WARNING: This page is about a different variant/trim than selected.

Ignition "OFF".
Disconnect PCM harness connector.
Ignition "ON".
Measure voltage between Brake Light Switch terminal of PCM harness connector and chassis ground.
Measure voltage between Brake Test Switch terminal of PCM harness connector and chassis ground.
Step on the brake pedal.
Measure voltage between Brake Light Switch terminal of PCM harness connector and chassis ground.

Measure voltage between Brake Test Switch terminal of PCM harness connector and chassis ground.

Specification

Test Condition	With releasing pedal	With stepping on pedal
Brake Light Switch	0V	Battery Voltage
Brake Test Switch	Battery Voltage	0V

Fig 1: Measuring Voltage Between Brake Light And Test Switch Terminal Of PCM Harness Connector And Chassis Ground

Courtesy of HYUNDAI MOTOR AMERICA

Is voltage within specification?
YES
- Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check Stop Lamp Switch for contamination, deterioration, or damage. Substitute with a known-good switch and check for proper operation. If the problem is corrected, replace switch and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.