CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
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Toyota Tundra Service Manual > Key Reminder Warning System: Parts Location
PARTS LOCATION ILLUSTRATION *1 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *2 COMBINATION METER ASSEMBLY *3 FRONT DOOR COURTESY LIGHT SWITCH LH *4 UNLOCK WARNING SWITCH ASSEMBLY *5 DRIVER SIDE JUNCTION BLOCK ASSEMBLY *6 DLC3 ...