DISASSEMBLY CAUTION / NOTICE / HINT HINT:
PROCEDURE 1. REMOVE REAR TURN SIGNAL LIGHT BULB
(a) Turn the rear turn signal light bulb socket with the rear turn signal light bulb in the direction indicated by the arrow to remove them as a unit.
2. REMOVE BACK UP LIGHT BULB
(a) Turn the back up light bulb socket with the back up light bulb in the direction indicated by the arrow to remove them as a unit.
3. REMOVE TAIL AND STOP LIGHT BULB
(a) Turn the tail and stop light bulb socket with the tail and stop light bulb in the direction indicated by the arrow to remove them as a unit.
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Toyota Tundra Service Manual > Sfi System: ECM Power Source Circuit
DESCRIPTION When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI relay) and supplying power to terminals + ...