Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Scion tC L4-2.5L (2AR-FE)FACTORY OEM SERVICE PROCEDURE
Removal
POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL
1. DISCONNECT CABLE FROM 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 Repair Instruction - Initialization.
2. REMOVE UPPER INSTRUMENT PANEL
Removal
3. REMOVE LOWER INSTRUMENT PANEL
Removal
4. REMOVE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Detach the 5 claws.
(b) Disconnect the 6 connectors.
(c) Detach the clamp.
(d) Remove the 2 screws and instrument panel junction block assembly.
5. REMOVE MULTIPLEX NETWORK BODY ECU
(a) Press the claw of the junction block as shown in the illustration to release the lock.
Text in Illustration
(b) With the junction block lock released, insert a screwdriver horizontally between the multiplex network body ECU and junction block.
NOTICE:
Use a screwdriver with a radius of between 5.0 mm (0.197 in.) and 6.3 mm (0.248 in.) and a length of 90 mm (3.54 in.) or more.
HINT
Tape the screwdriver tip before use.
(c) Using the screwdriver, carefully raise the multiplex network body ECU until the connector becomes disengaged.
Text in Illustration
NOTICE:
Do not twist the screwdriver to raise the multiplex network body ECU.
(d) Raise the multiplex network body ECU as shown by arrow (1), and then pull it out as shown by arrow (2) in the illustration.
NOTICE:
Do not touch the ECU connector.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
