Skid Control ECU. HINT: Inspect the ECU from the wire harness side while the connector is connected.

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Derick Dixon
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1 05968 TERMINALS OF ECU 1. CHECK BATTERY VOLTAGE (a) Measure the battery voltage. Standard: 10 to 14 V 2. SKID CONTROL ECU ASSY INSPECTION (a) Measure the voltage between each terminal or between each terminal and the body ground. (b) Connect the handheld tester to the DLC3, and check the communication condition with the skid control ECU. (c) Using an oscilloscope, check that the pulse generates between each terminal or between each terminal and the body ground. Inspection should be performed from the back of the connector with the connector connected to the skid control ECU. The voltage between terminals of the brake actuator assy may become 0 V due to the fail safe function when the ECB warning light comes on (malfunctioning). SKID CONTROL ECU Skid Control ECU 05IZ401 S7 S8 S9 S10 F47672 Inspect the ECU from the wire harness side while the connector is connected. Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition R1+ (S72) (S71) P W Main relay power to 13.6 V BS1 (S73) (S71) B W Battery source 1 SMC1 (S74) (S71) Y W Master cut solenoid 1 output 8.8 to 14 V +BCTY (S75) (S71) V W Courtesy power input Driver door open close SLAFR (S76) (S71) W W FR solenoid () output SLAFR+ (S77) (S71) R W FR solenoid (+) output Approx. 5 sec. 8 to 16 V Below 1 V E (S78) (S71) L W Pressure sensor ground VCM1 (S79) (S71) P W Pressure sensor power 4.75 to 5.25 V 2004 Prius Preliminary Release (RM1075U) 1132

2 05969 MR1+ (S711) (S71) GR W Motor relay power 1 SR1 (S712) (S71) L W Main relay output 1 Approx. 1.5 sec. or more after pushing start 8.8 to 14 V Below 1 V SCSS (S713) (S71) BR W Stroke simulator cut solenoid output Brake pedal depressed SLARL+ (S715) (S71) L W RL solenoid (+) output SLRRL+ (S716) (S71) W W RL solenoid (+) output SLRFR+ (S717) (S71) Y W FR solenoid (+) output After approx. 1.5 sec., brake pedal depressed released (see waveform 2) PRL (S718) (S71) G W RL pressure sensor input SG1 (S720) (S71) BR W Pressure sensor shield ground 1 PACC (S721) (S71) W W Accumulator pressure sensor input After pump motor operates and stops by pedal operation 3.3 to 4.7 V FR (S722) (S71) L W FR sensor () input PFR (S723) (S71) Y W FR pressure sensor input MR1 (S725) (S71) L W Motor relay output 1 Pump motor is operating SLRRL (S726) (S71) P W RL solenoid () output SLARL (S727) (S71) LG W RL solenoid () output MTT (S729) (S71) R W Motor test input Pump motor is operating 3.5 V or higher PMC1 (S730) (S71) R W Master pressure sensor input 1 PCK1 (S731) (S71) B W Pressure sensor check output to 5.25 V FR+ (S732) (S71) P W FR sensor (+) input Vehicle speed input SLRFR (S734) (S71) B W FR solenoid () output +BI1 (S83) (S81, 2) B W Main relay power input 1 10 to 14 V +BO1 (S85) (S81, 2) Y W Main relay power output 1 Push start switch ON 8.8 to 14 V IG1 (S87) (S81, 2) B W IG1 power Push start switch ON 10 to 14 V 2004 Prius Preliminary Release (RM1075U) 1133

3 05970 RSS (S810) (S81, 2) BR W Speed sensor shield ground BZ (S812) (S81, 2) BR W Warning buzzer output Buzzer is operating Below 1 V STP (S814) (S81, 2) R W Stop light switch signal input Brake pedal depressed released 10 to 12 V CANL (S818) (S81, 2) W W CAN communication (Send and receive) Check DTC using handheld tester CAN communication s DTC is not output CANH (S819) (S81, 2) B W CAN communication (Send and receive+) Check DTC using handheld tester CAN communication s DTC is not output FAIL (S820) (S81, 2) P W Capacitor communication (Receive) (see waveform 5) SP1 (S822) (S81, 2) V W Speed meter output Vehicle speed input (see waveform 4) RL (S827) (S81, 2) B W RL sensor () input D/G (S828) (S81, 2) W W Diagnosis output 9.1 to 13.6 V ENA (S830) (S81, 2) B W Capacitor communication (Send) (see waveform 6) TS (S832) (S81, 2) L W Sensor diagnosis check input 9.1 to 13.6 V VBZ (S833) (S81, 2) B W Warning buzzer power 9.1 to 13.6 V RL+ (S835) (S81, 2) W W RL sensor (+) input Vehicle speed input +BO2 (S94) (S91, 2) W WB Main relay power output to 14 V +BI2 (S95) (S91, 2) R WB Main relay power input 2 10 to 14 V VCSK (S96) (S91, 2) B WB Stroke sensor power 3.75 to 4.95 V SSK (S97) (S91, 2) Shielded WB Stroke sensor shield ground SKG (S98) (S91, 2) W WB Stroke sensor ground PKB (S914) (S91, 2) R WB Parking brake signal input Parking brake applied released 9.1 to 13.6 V SKS1 (S921) (S91, 2) R WB Stroke sensor signal input to 1.35 V SKS2 (S922) (S91, 2) G WB Stroke sensor signal input to 4.35 V RR (S923) (S91, 2) B WB RR sensor () input RR+ (S931) (S91, 2) W WB RR sensor (+) input Vehicle speed input SLAFL+ (S101) (S104) P WB FL solenoid (+) output SLAFL (S102) (S104) O WB FL solenoid () output SMC2 (S103) (S104) LG WB Master cut solenoid 2 output 2004 Prius Preliminary Release (RM1075U) 1134

4 05971 IG2 (S105) (S104) O WB IG2 power 10 to 14 V LBL (S106) (S104) P WB Brake fluid level switch input Reservoir level switch OFF ON 4 to 4.65 BS2 (S107) (S104) P WB Battery source to 14 V SLRFL+ (S108) (S104) Y WB FL solenoid (+) output After approx. 1.5 sec., brake pedal depressed released (see waveform 2) SLARR (S109) (S104) P WB RR solenoid ( ) output SG2 (S1012) (S104) Shielded WB Pressure sensor shield ground 2 FSS (S1013) (S104) BR WB Speed sensor shield ground VCM2 (S1014) (S104) B WB Pressure sensor power to 5.25 V SR2 (S1015) (S104) V WB Main relay output 2 Below 1 V R2+ (S1017) (S104) Y WB Main relay power to 13.6 V SLRRR (S1018) (S104) BR WB RR solenoid () output SLARR+ (S1019) (S104) V WB RR solenoid (+) output SLRRR+ (S1020) (S104) R WB RR solenoid (+) output PCK2 (S1021) (S104) L WB Pressure sensor check output to 5.25 V FL (S1022 ) (S104) G WB FL sensor () input PFL (S1023) (S104) R WB FL pressure sensor input MR2+ (S1025) (S104) R WB Motor relay power to Below 14 V SLRFL (S1026) (S104) L WB FL solenoid () output PMC2 (S1027) (S104) W WB Master pressure sensor input 2 FL+ (S1028) (S104) R WB FL sensor (+) input Vehicle speed input E2 (S1029) (S104) G WB Pressure sensor ground Prius Preliminary Release (RM1075U) 1135

5 05972 MR2 (S1030) (S104) G WB Motor relay output 2 PRR (S1031) (S104) Y WB RR pressure sensor input Pump motor is operating Waveform 1 Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V). While driving at approximately 12 mph (20 km/h). 5V/DIV, 200 ms/div. Brake pedal depressed. F47507 Waveform 2 Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V). While driving at approximately 12 mph (20 km/h). 5V/DIV, 200 ms/div. Brake pedal depress released F47507 Waveform 3 As the vehicle speed (tire rotating speed) becomes faster the cycle becomes shorter and the output voltage larger. 1V/DIV, 2 ms/div. While driving at approximately 18 mph (30 km/h). F47509 Waveform 4 As the vehicle speed (tire rotating speed) becomes faster the cycle becomes shorter. 5V/DIV, 50 ms/div. While driving at approximately 12 mph (20 km/h). F Prius Preliminary Release (RM1075U) 1136

6 05973 Waveform 5 5V/DIV, 200 ms/div. Power F47511 Waveform 6 5V/DIV, 100 ms/div. Power F Prius Preliminary Release (RM1075U) 1137

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