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.
1994 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
TRAC Solenoid Relay
- Remove TRAC solenoid relay. Measure voltage between TRAC solenoid relay terminal No. 1 and body ground. If voltage is not 10-14 volts, check and repair harness or connector.
- Check continuity between TRAC solenoid relay terminal No. 2 and ABS/TRAC ECU terminals SAC, SMC and SRC. See TERMINAL IDENTIFICATION table. See Figure. If readings are not 2 ohms, replace TRAC solenoid relay.
TERMINAL IDENTIFICATION
| Application | Connector No. | Terminal No. |
|---|---|---|
| Terminal SAC | A21 | 12 |
| Terminal SMC | A21 | 2 |
| Terminal SRC | A21 | 15 |
| Terminal MTT | A21 | 3 |
Factory Service Tools
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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.
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