Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: PIG Power Supply Voltage (C1552,C1554)

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 fuse
  • PIG power source circuit
  • Power steering ECU assembly

EPS warning light: Comes on

Engine switch on (IG) again

-

C1554

Power Supply Relay Failure

Power source relay circuit malfunction

  • EPS fuse
  • PIG power source circuit
  • Power steering ECU assembly

EPS warning light: Comes on

Engine switch on (IG) again

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

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:

Tester Connection

Condition

Specified Condition

J5-2 (PGND) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Power Steering ECU Assembly)

OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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