Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1999CAMRY XLE, 2.2 GREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM W/TRACTION CONTROL SYSTEMDIAGNOSTIC TESTSDTC 49: STOPLIGHT SWITCHDIAGNOSTIC PROCEDURE
1999 Toyota Camry XLE, 2.2 G
Diagnostic Procedure
1999 Toyota Camry XLE, 2.2 GSECTION Diagnostic Procedure
- Depress brake pedal and ensure brakelights illuminate. If brakelights illuminate, go to next step. If brakelights do not illuminate, check stoplight switch adjustment. See STOPLIGHT SWITCH under ADJUSTMENTS.
- Turn ignition off. Remove ABS/TRAC ECU. Do not disconnect electrical connectors. Measure voltage between ground and terminal STP at ABS/TRAC ECU harness connector when brake pedal is depressed. See Figure. If voltage is 8-14 volts, stoplight switch circuit is okay at this time. If voltage is not 8-14 volts, go to next step.
- Check for open circuit in wiring harness between stoplight switch and ABS/TRAC ECU. Repair as necessary. See WIRING DIAGRAMS . If wiring harness is okay, substitute a known-good ABS/TRAC ECU and retest system.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.