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 MANUALSTOYOTA2008YARIS S, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 75 (AIR CONDITIONING SYSTEM (DIAGNOSTIC CODES & CIRCUIT TESTS))AIR CONDITIONING SYSTEMDTC B1499/99: MULTIPLEX COMMUNICATION CIRCUITPROCEDURE
2008 Toyota Yaris S, 4D Sedan, Automatic
DTC B1499/99: Multiplex Communication Circuit: Procedure
2008 Toyota Yaris S, 4D Sedan, AutomaticSECTION Procedure
WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DIAGNOSTIC TROUBLE CODE (DTC B1499/99)
- Clear the DTC. Refer to DTC CHECK / CLEAR .
- Read the DTC. Refer to DTC CHECK / CLEAR
.
Result
Result Proceed to DTC (B1499/99) is not output A DTC (B1499/99) is output B
B → GO TO MULTIPLEX COMMUNICATION SYSTEM
A → SYSTEM OK
RENDER: 1.0x
NO RELATED
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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.