DESCRIPTION The skid control ECU (brake actuator assembly) receives stop light switch assembly signals and uses them to determine whether or not the brakes are applied. The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect a short in the stop light input signal circuit or stop light circuit when the stop light switch assembly is on (brake pedal depressed). If the skid control ECU (brake actuator assembly) detects a short in this circuit, it will store this DTC.
WIRING DIAGRAM Refer to DTC C1249. Click here CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Check the brake pedal height installation. Click here
(b) Check the stop light switch assembly installation. Click here OK: The brake pedal height and stop light switch assembly installation are normal. HINT: If the on/off status of the stop light switch assembly and pressure increase information from the master cylinder pressure sensor do not match due to an improperly installed brake pedal or stop light switch assembly, this DTC may be stored. Therefore, be sure to check the installation condition of the pedal and switch before inspecting the input signals and other related parts.
(a) Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released. OK:
(a) Check the stop light switch assembly. Click here OK: The stop light switch assembly is normal.
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List. ABS/VSC/TRAC
(d) Check that the stop light switch assembly display observed on the Techstream changes according to brake pedal operation. OK: The Techstream displays on or off according to brake pedal operation.
(a) Clear the DTCs. Click here (b) Turn the ignition switch off. (c) Start the engine. (d) Depress the brake pedal several times to test the stop light circuit. (e) Check if the same DTC is output. Click here
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected. (c) Disconnect the A57 skid control ECU (brake actuator assembly) connector. (d) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (e) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Check the stop light switch assembly. Click here OK: The stop light switch assembly is normal.
(b) Disconnect the A57 skid control ECU (brake actuator assembly) connector. (c) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (d) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Reconnect the A57 skid control ECU (brake actuator assembly) connector. (b) Clear the DTCs. Click here (c) Turn the ignition switch off. (d) Start the engine. (e) Depress the brake pedal several times to test the stop light circuit. (f) Check if the same DTC is output. Click here
HINT: If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly). Click here
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Toyota Tundra Service Manual > Tire Pressure Warning Valve And Transmitter: Installation
INSTALLATION CAUTION / NOTICE / HINT NOTICE: Always use a new grommet and valve core when installing the tire pressure warning valve and transmitter. Check that the washer and nut are not damaged, and replace them if necessary. Make sure not to damage the urethane covered backside of the tire pressu ...
