DESCRIPTION
If a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
---|---|---|---|---|---|---|
C1552 | PIG Power Supply Voltage | PIG power source circuit malfunction |
| EPS warning light: Comes on | Engine switch on (IG) again | - |
C1554 | Power Supply Relay Failure | Power source relay circuit malfunction |
| EPS warning light: Comes on | Engine switch on (IG) again | - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. | CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND) |
(a) Disconnect the J5 power steering ECU assembly connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
J5-1 (PIG) - Body ground | Engine switch on (IG) | 9 to 16 V |
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | ![]() | REPLACE POWER STEERING ECU ASSEMBLY |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Engine Unit: Components
COMPONENTS ILLUSTRATION *A for 2WD *B for AWD *C Type A *D Type B *E w/ Oil Cooler - - *1 IGNITION COIL ASSEMBLY *2 VACUUM PUMP ASSEMBLY *3 NO. 2 WATER BY-PASS HOSE *4 NO. 3 WATER BY-PASS HOSE *5 VENTILATION HOSE *6 NO. 2 VENTILATION HOSE ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Rear Seat Inner Belt Assembly(for Lh Side): Components
COMPONENTS ILLUSTRATION *A for Manual Seat *B for Power Seat *1 NO. 1 RECLINING ADJUSTER RELEASE HANDLE LH *2 POWER SEAT SWITCH ASSEMBLY *3 REAR CENTER SEAT INNER BELT ASSEMBLY *4 REAR SEAT COVER CAP LH *5 REAR SEAT INNER BELT ASSEMBLY LH *6 SEPARATE TYPE REAR ...