ELECTRONIC POWER STEERING SYSTEM - TERMINALS OF ECU
- The power steering ECU assembly uses waterproof connectors. Therefore, voltage or waveforms cannot be checked with the connectors connected to the vehicle.
| Terminal No. (Symbols) | Wiring Color | Terminal Description |
| A31-2 (CANH) | B | High-level CAN bus line |
| A31-3 (CANL) | R | Low-level CAN bus line |
| A31-4 (PIG) | R | Power source |
| A31-5 (PGND) | B | Power ground |
| A31-9 (IG) | B-Y | IG power source |
| C4-1 (RZG) | G | Rotation angle sensor power source circuit ground |
| C4-2 (SRZG) | BR | Rotation angle sensor shield ground |
| C4-3 (RZV) | B | Rotation angle sensor power source |
| C4-4 (TRQV) | W | Torque sensor power source |
| C4-6 (TQG1) | L-W | Torque sensor power source circuit ground |
| C4-7 (RZSN) | W | SIN phase input signal (Rotation angle sensor) |
| C4-8 (RZCS) | R | COS phase input signal (Rotation angle sensor) |
| C4-9 (INSN) | G-W | SIN phase input signal (torque sensor input shaft side) |
| C4-10 (INCS) | R-L | COS phase input signal (torque sensor input shaft side) |
| C4-11 (OUSN) | G-B | SIN phase input signal (torque sensor output shaft side) |
| C4-12 (OUCS) | Y-B | COS phase input signal (torque sensor output shaft side) |
| C4-13 (TQG2) | R-B | Torque sensor detection circuit ground |
| C5-1 (V) | W | V phase motor output |
| C5-2 (U) | B | U phase motor output |
| C5-3 (W) | R | W phase motor output |
| INSPECT WIRE HARNESS SIDE CONNECTOR |
| Terminal No. (Symbols) | Wiring Color | Terminal Description | Condition | Specified Condition |
| A31-4 (PIG) - A31-5 (PGND) | R - B | Power source | Always | Below 1 V |
| A31-5 (PGND) - Body ground | B - Body ground | Power ground | Always | Below 1 Ω |
| A31-9 (IG) - A31-5 (PGND) | B-Y - B | IG power source | Engine switch on (IG) | 10 to 14 V |
| C5-2 (U) - C5-3 (W)/C5-1 (V) | B - R/W | U phase motor output | Always | Below 1 Ω |
| C5-3 (W) - C5-2 (U)/C5-1 (V) | R - B/W | W phase motor output | Always | Below 1 Ω |
| C5-1 (V) - C5-2 (U)/ C5-3 (W) | W - B/R | V phase motor output | Always | Below 1 Ω |
LEXUS IS250, IS220d / GSE20 ALE20