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 (a) Disconnect the cable from the negative (-) battery terminal. CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ). 3. REMOVE NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY
4. REMOVE LOWER INSTRUMENT PANEL
5. REMOVE LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY
6. REMOVE NO.4 INSTRUMENT REGISTER SUB-ASSEMBLY
7. REMOVE INSTRUMENT SIDE PANEL RH
8. REMOVE NO.2 INSTRUMENT CLUSTER FINISH PANEL GARNISH
9. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL SUB-ASSEMBLY RH
10. REMOVE CLEARANCE WARNING ECU WITH BRACKET
(b) Remove the bolt, nut and clearance warning ECU with bracket. 11. REMOVE CLEARANCE WARNING ECU ASSEMBLY
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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 + ...