CHECK AT ASTC-ECU TERMINALS


TERMINAL VOLTAGE CHECK
1.Do not disconnect the ASTC-ECU connector, and measure the voltages between earth terminal No.13 or No.38 and each respective terminal.
2.The terminal layout is shown in the illustration.


Terminal No.
 Terminal code
 Check item
 Checking requirements
 Normal condition
1
 +BM
 Motor power supply
 Always
 Battery voltage
2
 -
 -
 -
 -
3
 ASTP
 Stop lamp relay
 Always
 Approximately system voltage
4
 FR-
 Wheel speed sensor (FR) signal
 -
 -
5-7
 -
 -
 -
 -
8
 FL-
 Wheel speed sensor (FL) signal
 -
 -
9-11
 -
 -
 -
 -
12
 SWON
 ASC OFF switch
 ASC OFF switch: "ON"
 1 V or less
ASC OFF switch: "OFF"
 Approximately system voltage
13
 -
 -
 -
 -
14
 CANL
 CAN bus line
 -
 -
15
 FCSW
 Forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System ON/OFF switch
 Forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System ON/OFF switch: "ON"
 1 V or less
Forward collision mitigation system (FCM) and Ultrasonic misacceleration Mitigation System ON/OFF switch: "OFF"
 Approximately system voltage
16
 FR+
 Wheel speed sensor (FR) power supply
 Ignition switch: "ON"
 Approximately system voltage
17
 RR+
 Wheel speed sensor (RR) power supply
 Ignition switch: "ON"
 Approximately system voltage
18
 RL-
 Wheel speed sensor (RL) signal
 -
 -
19
 FL+
 Wheel speed sensor (FL) power supply
 Ignition switch: "ON"
 Approximately system voltage
20, 21
 -
 -
 -
 -
22
 STP
 Stop lamp monitor
 The brake pedal is released.
 1 V or less
The brake pedal is depressed.
 Approximately system voltage
23, 24
 -
 -
 -
 -
25
 +BV
 Solenoid valve power supply
 Always
 Battery voltage
26
 CANH
 CAN bus line
 -
 -
27
 -
 -
 -
 -
28
 IG1
 ASTC-ECU power supply(IG1)
 Ignition switch: "ON"
Battery voltage
Ignition switch: "OFF"
1 V or less
29
 RR-
 Wheel speed sensor (RR) signal
 -
 -
30
 -
 -
 -
 -
31
 RL+
 Wheel speed sensor (RL) power supply
 Ignition switch: "ON"
 Approximately system voltage
32-38
 -
 -
 -
 -

CONTINUITY CHECK AT WIRING HARNESS-SIDE CONNECTOR
1.Turn the ignition switch to the LOCK (OFF) position.
2.Disconnect the ASTC-ECU connector.
3.Check the resistance and continuity between the terminals indicated in the table below.
4.The terminal layout is shown in the illustration.


Terminal No.
 Signal
 Normal condition
13 - body earth
 Earth
 Continuity exists (2 Ω or less)
38 - body earth
 Earth
 Continuity exists (2 Ω or less)