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.
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HOMESERVICE MANUALSTOYOTA2006SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISBODY AND FRAMESEATSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSNON-TROUBLE CODE PROCEDURESECU POWER SOURCE CIRCUIT
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
ECU Power Source Circuit
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION ECU Power Source Circuit
ECU Power Source Circuit
DESCRIPTION
The position control ECU is contained in the switch assembly.
During manual operation, only one switch signal is accepted. If signals are input from 2 or more switches simultaneously, all of them are ignored. However, when signals are input from only the front vertical switch and lifter switch simultaneously, the signal from the lifter switch is accepted.
During automatic operation, a manual switch input overrides any other operations, i.e. automatic operations stop and the manual input operation is accepted. For example, if a manual switch input is activated, during a seat store/restore operation, the previous operation will cease and manual operation will be performed.
After the manual operation is performed, the previous automatic operation will not resume. Power mirror store/restore operation is unaffected by manual switch inputs.
The position control ECU and switch assembly disallows the restore operation of the power seat when the system detects that the voltage of terminal SYSB is less than 8 V for 0.3 seconds or is more than 10 V for 30 seconds.
This circuit is a power source circuit of the position control ECU and switch assembly.
HINT: Manual adjustment of the slide reclining lumbar can be performed even when the ECU is not functional if current is allowed to flow into terminals +B and SYSB.
Lumbar operation can always be performed.
INSPECTION PROCEDURE
DESCRIPTION
The position control ECU is contained in the switch assembly.
During manual operation, only one switch signal is accepted. If signals are input from 2 or more switches simultaneously, all of them are ignored. However, when signals are input from only the front vertical switch and lifter switch simultaneously, the signal from the lifter switch is accepted.
During automatic operation, a manual switch input overrides any other operations, i.e. automatic operations stop and the manual input operation is accepted. For example, if a manual switch input is activated, during a seat store/restore operation, the previous operation will cease and manual operation will be performed.
After the manual operation is performed, the previous automatic operation will not resume. Power mirror store/restore operation is unaffected by manual switch inputs.
The position control ECU and switch assembly disallows the restore operation of the power seat when the system detects that the voltage of terminal SYSB is less than 8 V for 0.3 seconds or is more than 10 V for 30 seconds.
This circuit is a power source circuit of the position control ECU and switch assembly.
HINT: Manual adjustment of the slide reclining lumbar can be performed even when the ECU is not functional if current is allowed to flow into terminals +B and SYSB.
Lumbar operation can always be performed.
Wiring Diagram:
Step 1:
Step 1(Continued)-2:
INSPECTION PROCEDURE
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.