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Diagnosis & Repair

WARNING: This page is about a different car, the 2000 Lexus SC 400, 2000 Lexus SC 300, 1999 Lexus SC 400, and 1999 Lexus SC 300. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition on. Using a voltmeter, check voltage between terminals Tc and E1 of DLC1 or DLC2. See Figure. If 10-14 volts exists, circuit is okay. Connect a fused jumper wire or Service Connector (SST 09843-18020) between DLC1 or DLC2 terminals Tc and E1. Check ABS warning light. If ABS warning light does not blink, ABS/TRAC ECU may be faulty. If 10-14 volts does not exist, check for open or short circuit in wiring harness between ABS/TRAC ECU, DLC1 or DLC2, and between DLC1 or DLC2 and ground. If wiring harness is okay, replace ABS/TRAC ECU.

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