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 MANUALSLEXUS1998SC 300REPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLTRACTION CONTROL SYSTEMCONNECTOR IDENTIFICATION

1998 Lexus SC 300

Connector Identification

1998 Lexus SC 300SECTION Connector Identification

CONNECTOR IDENTIFICATION

Description	See Fig.
ABS Electronic Control Unit	11-13
Check Harness	14
Electronic Control Module (ECM)	15-17
Sub-Throttle Actuator	18
TRAC Actuator	19
TRAC Motor Relay	20
TRAC Pump Motor	21
Throttle Valve Motor Driver	22

Fig 1: Identifying ABS/TRAC ECU Connector GS300

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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.