The following may indicate that your vehicle is overheating:
Correction procedures 1. Stop the vehicle in a safe place and turn off the air conditioning system, and then stop the engine. 2. If you see steam: Carefully lift the hood after the steam subsides. If you do not see steam: Carefully lift the hood. 3. After the engine has cooled down sufficiently, inspect the hoses and radiator core (radiator) for any leaks.
If a large amount of coolant leaks, immediately contact your Toyota dealer. 4. The coolant level is satisfactory if it is between the "FULL" and "LOW" lines on the reservoir.
5. Add coolant if necessary. Water can be used in an emergency if coolant is unavailable. 6. Start the engine to check that the radiator cooling fan operates and to check for coolant leaks from the radiator or hoses. 7. If the fan is not operating: Stop the engine immediately and contact your Toyota dealer. If the fan is operating: Have the vehicle inspected at the nearest Toyota dealer.
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Toyota Tundra Service Manual > Airbag System: Short in Passenger Side Airbag Variable Vent Hole Squib Circuit (B181A-B181D)
DESCRIPTION The variable vent hole squib circuit consists of the airbag sensor assembly and instrument panel passenger without door airbag assembly. The circuit instructs the SRS to deploy when the deployment conditions are met. These DTCs are stored when a malfunction is detected in the variable ve ...