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.
2007 Lexus SC 430FACTORY OEM SERVICE PROCEDURE
Terminals Of Ecu
- CHECK SKID CONTROL ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Measure the voltage and resistance of the connectors.TERMINAL DESCRIPTION SPECIFIED CONDITION CHART
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition SRLR (S5-1) - GND (S5-16, 22, S8-6, 31) L-Y - W-B Rear decompression solenoid LH output Ignition switch ON, ABS warning light OFF 10 to 14 V MR2 (S5-2) - R2+ (S5-3) G-R - Y-G TRAC motor relay solenoid output Ignition switch ON, hydraulic brake booster pump motor stops Below 1 V SFRH (S5-4) - GND (S5-16, 22, S8-6, 31) W-L - W-B Front holding solenoid RH output Ignition switch ON, ABS warning light OFF 10 to 14 V SRLH (S5-5) - GND (S5-16, 22, S8-6, 31) L-B - W-B Rear holding solenoid LH output Ignition switch ON, ABS warning light OFF 10 to 14 V AST (S5-6) - GND (S5-16, 22, S8-6, 31) Y-R - W-B Solenoid relay test input Ignition switch ON, ABS warning light OFF 10 to 14 V SFRR (S5-8) - GND (S5-16, 22, S8-6, 31) W-G - W-B Front decompression solenoid RH output Ignition switch ON, ABS warning light OFF 10 to 14 V PL (S5-9) - GND (S5-16, 22, S8-6, 31) GR-L - W-B Pressure switch (Low) input Ignition switch ON, pressure switch ON 3 to 5 V PL (S5-9) - GND (S5-16, 22, S8-6, 31) GR-L - W-B Pressure switch (Low) input Ignition switch ON, pressure switch OFF 7 to 11 V ENG+ (S5-11) - ENG- (S5-18) R-L - G-Y Translate ECU communication input Ignition switch ON Pulse generation LBL (S5-12) - GND (S5-16, 22, S8-6, 31) Y-B - W-B Brake fluid level warning switch input Ignition switch ON, ABS warning light OFF 10 to 14 V SOL+ (S5-14) - SOL- (S5-21) B-Y - L PPS solenoid output Ignition switch ON, ABS warning light OFF 3.5 to 8 V TRC+ (S5-20) - TRC- (S5-13) P - V Translate ECU communication output Ignition switch ON Pulse generation VGS (S6-1) - GGND (S6-21) BR - L Yaw rate sensor power source Ignition switch ON 4.5 to 5.5 V IG2 (S6-6) - GND (S5-16, 22, S8-6, 31) SB - W-B IG2 power source Ignition switch ON 10 to 14 V PKB (S6-8) - GND (S5-16, 22, S8-6, 31) R-B - W-B Parking brake switch input Ignition switch ON, parking brake switch ON Below 1.5 V PKB (S6-8) - GND (S5-16, 22, S8-6, 31) R-B - W-B Parking brake switch input Ignition switch ON, parking brake switch OFF 10 to 14 V GL2 (S6-10) - GGND (S6-21) Y - L G sensor 2 input Ignition switch ON, vehicle is on level surface 2.0 to 3.0 V CSW (S6-12) - GND (S5-16, 22, S8-6, 31) O - W-B TRAC cut switch input Ignition switch ON, VSC OFF switch pushed in Below 1.5 V CSW (S6-12) - GND (S5-16, 22, S8-6, 31) O - W-B TRAC cut switch input Ignition switch ON, VSC OFF switch not pushed 8 to 14 V SS1+ (S6-14) - SS1- (S6-23) P - LG Steering sensor (+) input Engine idling, slowly turn steering wheel Pulse generation SP1 (S6-16) - GND (S5-16, 22, S8-6, 31) V-W-B Speed signal output Vehicle driving at about 20 km/h (12 mph) Pulse generation MPX1 (S6-17) - GND (S5-16, 22, S8-6, 31) L-O - W-B Multiplex communication line Multiplex communication circuit - YSS (S6-18) - GND (S5-16, 22, S8-6, 31) Shielded - W-B Yaw rate sensor shielded ground Ignition switch OFF Below 1 Ω YD (S6-19) - GGND (S6-21) R-L Yaw rate sensor diagnosis Approx. 1 sec. after ignition switch turned ON 4.5 to 5.5 V GGND (S6-21) - GND (S5-16, 22, S8-6, 31) L-W-B Yaw rate sensor ground Ignition switch OFF Below 1 Ω GL1 (S6-22) - GGND (S6-21) G-L G sensor 1 sensor input Ignition switch ON, vehicle is on level surface 2.0 to 3.0 V FLO (S6-25) - GND (S5-16, 22, S8-6, 31) LG - W-B Vehicle speed signal output Vehicle driving at about 2b km/h (12 mph) Pulse generation YAW (S6-28) - GGND (S6-21) W-L Yaw rate sensor input Ignition switch ON, vehicle is in stationary condition 2.0 to 3.0 V BZ (S7-2) - GND (S5-16, 22, S8-6, 31) V - W-B Skid control buzzer output Ignition switch ON, skid control buzzer is sounded Below 1.5 V BZ (S7-2) - GND (S5-16, 22, S8-6, 31) V - W-B Skid control buzzer output Ignition switch ON, skid control buzzer is not sounded 10 to 14 V MPX2 (S7-3) - GND (S5-16,22,S8-6,31) R-L - W-B Multiplex communication line Multiplex communication circuit - D/G (S7-4) - GND (S5-16, 22, S8-6, 31) W-L - W-B Diagnostic tester communication line Ignition switch ON 10 to 14 V IG1 (S7-6) - GND (S5-16, 22, S8-6, 31) R-W-B IG1 power source Ignition switch ON 10 to 14 V TRIG (S7-8) - GND (S5-16, 22, S8-6, 31) W-R - W-B Steering sensor output Ignition switch ON, ABS warning light OFF 3.5 to 14 V +BO (S7-9) - GND (S5-16, 22, S8-6, 31) L - W-B Steering sensor power source Ignition switch ON, ABS warning light OFF 10 to 14 V STP (S7-10) - GND (S5-16, 22, S8-6, 31) G-0 - W-B Stop light switch input Stop light switch OFF Below 1.5 V STP (S7-10) - GND (S5-16, 22, S8-6, 31) G-O - W-B Stop light switch input Stop light switch ON 8 to 14 V TS (S7-12) - GND (S5-16, 22, S8-6, 31) B-W - W-B Terminal TS of DLC3 Ignition switch OFF Below 1 V TS (S7-12) - GND (S5-16, 22, S8-6, 31) B-W - W-B Terminal TS of DLC3 Ignition switch ON 10 to 14 V +BI (S7-17) - GND (S5-16, 22, S8-6, 31) B-W - W-B Power supply steering sensor Ignition switch ON, ABS warning light OFF 10 to 14 V RL+ (S7-18) - RL- (S7-19) BR - G Rear wheel speed sensor LH input Ignition switch ON, slowly turn rear LH wheel Pulse generation RR+ (S7-20) - RR- (S7-21) P - O Rear wheel speed sensor RH input Ignition switch ON, slowly turn rear RH wheel Pulse generation SA1 (S8-2) - GND (S5-16, 22, S8-6, 31) V - W-B Front RH ABS switching solenoid output Ignition switch ON, ABS warning light OFF 10 to 14 V SA2 (S8-3) - GND (S5-16, 22, S8-6, 31) R-L - W-B Front RH ABS switching solenoid output Ignition switch ON, ABS warning light OFF 10 to 14 V SA3 (S8-4) - GND (S5-16, 22, S8-6, 31) P - W-B Rear ABS switching solenoid output Ignition switch ON, ABS warning light OFF 10 to 14 V STR (S8-5) - GND (S5-16, 22, S8-6, 31) BR - W-B VSC switching solenoid output Ignition switch ON, ABS warning light OFF 10 to 14 V SFLR (S8-7) - GND (S5-16, 22, S8-6, 31) R-W - W-B Front decompression solenoid LH output Ignition switch ON, ABS warning light OFF 10 to 14 V SRRH (S8-8) - GND (S5-16, 22, S8-6, 31) Y - W-B Rear holding solenoid RH output Ignition switch ON, ABS warning light OFF 10 to 14 V SRRR (S8-9) - GND (S5-16, 22, S8-6, 31) Y-G - W-B Rear decompression solenoid RH output Ignition switch ON, ABS warning light OFF 10 to 14 V VCM (S8-10) - GND (S5-16, 22, S8-6, 31) B - W-B Master cylinder sensor power source Ignition switch ON 4.5 to 14 V PH (S8-11) - GND (S5-16, 22.S8-6, 31) B-W - W-B Pressure switch (PH) input Ignition switch ON, pressure switch (PH) ON Below 1 V PH (S8-11) - GND (S5-16, 22, S8-6, 31) B-W - W-B Pressure switch (PH) input Ignition switch ON, pressure switch (PH) OFF 5 to 8 V FR+ (S8-14) - FR- (S8-13) LG - G Front wheel speed sensor RH input Ignition switch ON, slowly turn right front wheel Pulse generation FL+ (S8-16) - FL- (S8-15) L-W - L Front wheel speed sensor LH input Ignition switch ON, slowly turn left front wheel Pulse generation SR (S8-19) - R1+ (S8-1) W - Y-R Solenoid relay output Ignition switch ON, ABS warning light OFF 10 to 14 V SFLH (S8-21) - GND (S5-16, 22, S8-6, 31) W-R - W-B FL holding solenoid output Ignition switch ON, ABS warning light OFF 10 to 14 V PMC (S8-22) - E2 (S8-23) R - W Master cylinder sensor input Ignition switch ON, stop light switch OFF 0.3 to 0.7 V E2 (S8-23) - GND (S5-16, 22, S8-6, 31) W - W-B ACC pressure sensor ground Ignition switch OFF Below 1 Ω FSS (S8-24) - GND (S5-16, 22, S8-6, 31) Shielded - W-B Master cylinder sensor shielded ground Ignition switch OFF Below 1 Ω MTT (S8-27) - GND (S5-16, 22, S8-6, 31) R-B - W-B Motor test input Ignition switch ON (Motor relay is OFF) Below 1.5 V MTT (S8-27) - GND (S5-16, 22, S8-6, 31) R-B - W-B Motor test input Ignition switch ON (Motor relay is ON) 8 to 14 V MT+ (S8-28) - MT- (S8-18) L-Y - GR Motor relay input Ignition switch ON Pulse generation MR1 (S8-29) - R1+ (S8-1) W-G - Y-R ABS motor relay output Ignition switch ON, hydraulic brake booster pump motor stops Below 1 V If the result is not as specified, the ECU may be malfunctioning.
- Measure the voltage and resistance of the connectors.
- CHECK TRANSLATE ECU
- Measure the voltage of the connector.TERMINAL DESCRIPTION SPECIFIED CONDITION CHART
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition IG1 (T28-1) - GND (T28-40) R - W-B IG1 power source Ignition switch ON 10 to 14 V CANH (T28-8) - CANL (T28-10) R - W Multiplex communication line Ignition switch ON Pulse generation ENG+ (T28-14) - ENG- (T28-15) O - LG ECM communication line Ignition switch ON Pulse generation TRC+ (T28-16) - TRC- (T28-17) P - V ECM communication line Ignition switch ON Pulse generation If the result is not as specified, the ECU may be malfunctioning.
- Measure the voltage of the connector.
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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