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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 357 (FRONT POWER SEAT CONTROL SYSTEM (WITH MEMORY) - DIAGNOSIS)ECU POWER SOURCE CIRCUITINSPECTION PROCEDURE

2004 Toyota Celica GT, Standard

Inspection Procedure

2004 Toyota Celica GT, StandardSECTION Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE (ECU-B, PWR SEAT, ECU-IG, AM1)
1. Remove ECU-B, PWR SEAT, ECU-IG and AM1 fuses from the driver side J/B.
2. Measure the resistance.
  Standard: Below 1 Ω
NG: REPLACE FUSE

OK: Go to next step.
INSPECT POSITION CONTROL ECU & SWITCH ASSY
1. Disconnect M6 and M7 ECU connectors.
2. Measure the voltage of each terminal of the wire harness side connectors.
  
  Fig 1: Identifying Terminal M6, M7 ECU Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Position Control ECU Specified Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance between M7 ECU wire harness side connector and body ground.
Standard:

Fig 3: Switch Assembly Specified Condition Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

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.