REMOVAL PROCEDURE 1. PRECAUTION NOTICE: After
turning the ignition switch off, waiting time may be required before
disconnecting the cable from the battery terminal. Therefore, make sure
to read the disconnecting the cable from the battery terminal notice
before proceeding with work (See page 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 3. REMOVE STEERING COLUMN ASSEMBLY (a) for Manual Tilt: (See page
(b) for Manual Tilt and Manual Telescopic Steering Column: (See page
4. REMOVE UPPER STEERING COLUMN WITH SWITCH BRACKET ASSEMBLY (for Manual Tilt) 5. REMOVE UPPER STEERING COLUMN WITH SWITCH BRACKET ASSEMBLY (for Manual Tilt and Manual Telescopic Steering Column) 6. REMOVE IGNITION SWITCH ASSEMBLY (a) Detach the 2 claws and remove the ignition switch from the steering lock. |
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 + ...