Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIZL
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1551; IG Power Supply Voltage Malfunction; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

C1551

IG Power Supply Voltage Malfunction

DESCRIPTION

The steering column assembly (power steering ECU) distinguishes the ignition switch status as ON or off through the IG power source circuit.

DTC No.

DTC Detection Condition

Trouble Area

C1551

Open or short in IG power source circuit with ignition switch ON
  • IG power source circuit
  • Steering column assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When the steering column assembly is replaced, perform the assist map writing (See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: REGISTRATION ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (STEERING COLUMN ASSEMBLY - IG POWER SUPPLY AND BODY GROUND)

(a) Disconnect the connectors from the steering column assembly (power steering ECU).

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D35-5 (IG) - Body ground

Ignition switch ON

11 to 14 V

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D36-2 (PGND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector:

(to Steering Column Assembly (Power Steering ECU))
OK

REPLACE STEERING COLUMN ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR