P1703 – Brake Switch Signal (Toyota)

Description

The ECM detected an abnormal brake switch signal affecting shift interlock and transmission control.

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Symptoms

Shift interlock stuck
Hard shifting
No shift from park
Brake lights malfunction
Check engine light

Causes

Faulty brake switch
Wiring issues
Connector corrosion
Misadjusted switch
TCM signal error

Diagnosis

Test brake switch
Inspect wiring
Check connectors
Scan TCM data
Verify brake light operation

Repair

Replace brake switch
Repair wiring
Clean connectors
Adjust switch