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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock - W/Traction Control >> Diagnostic Tests >> DTC 13 Or 14: Abs Motor Relay Circuit >> Circuit Description

Circuit Description

ABS motor relay supplies power to ABS pump motor. ABS/TRAC ECU switches motor relay on and operates ABS pump motor when ABS/TRAC is activated. DTC 13 is set when ABS/TRAC ECU detects less than 1.5 volts at ABS/TRAC ECU connector A20, terminal No. 12 (Yellow wire), or zero volts at ABS/TRAC ECU connector A20, terminal No. 5 (Blue/White wire). See Figure. DTC 14 is set when ABS/TRAC ECU detects battery voltage at ABS/TRAC ECU connector A20, terminal No. 12 (Yellow wire), or battery voltage at ABS/TRAC ECU connector A20, terminal No. 5 (Blue/White wire). See Figure. If trouble occurs in ABS motor relay circuit, ABS/TRAC ECU performs a fail safe function, turning off current to ABS solenoid relay and prohibiting ABS/TRAC control. Possible causes are:

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