Toyota CH-R Service Manual: Diagnostic Trouble Code Chart

Toyota CH-R Service Manual / Steering Column / Steering Lock System / Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Steering Lock System

DTC No.	Detection Item	DTC Detection Condition	Note
B2781	Open / Short in Steering Lock ECU	One of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).)): The steering lock sensor or unlock sensor is malfunctioning (When both detection switches turn on, the system is determined to be malfunctioning). The steering lock motor activation circuit has a short circuit. The steering lock motor activation circuit has an open circuit.	DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous).
B2782	Power Source Control ECU Malfunction	Either of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).)): The steering lock motor activation command circuit has a short circuit. The steering lock motor activation command circuit has an open circuit. HINT: If the power supply signal from the LIN communication line does not match the power supply signal from the direct line, the system is determined to be malfunctioning.	DTC Output Confirmation Operation: Perform a steering lock/unlock operation. (The steering locks when a door is opened with the shift lever in P and the engine switch off. The steering unlocks when the engine switch is turned on (ACC) or on (IG) while carrying the key.)
B2788	IG2 Signal Malfunction	Mismatch between the steering lock ECU (steering lock actuator or upper bracket assembly) IG2 input from the LIN communication system and from the direct line. (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).))	DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous).

DTC No.

Detection Item

DTC Detection Condition

Note

Link

B2781

Open / Short in Steering Lock ECU

One of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).)):

The steering lock sensor or unlock sensor is malfunctioning (When both detection switches turn on, the system is determined to be malfunctioning).
The steering lock motor activation circuit has a short circuit.
The steering lock motor activation circuit has an open circuit.

DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous).

B2782

Power Source Control ECU Malfunction

Either of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).)):

The steering lock motor activation command circuit has a short circuit.
The steering lock motor activation command circuit has an open circuit.

HINT:

If the power supply signal from the LIN communication line does not match the power supply signal from the direct line, the system is determined to be malfunctioning.

DTC Output Confirmation Operation: Perform a steering lock/unlock operation. (The steering locks when a door is opened with the shift lever in P and the engine switch off. The steering unlocks when the engine switch is turned on (ACC) or on (IG) while carrying the key.)

B2788

IG2 Signal Malfunction

Mismatch between the steering lock ECU (steering lock actuator or upper bracket assembly) IG2 input from the LIN communication system and from the direct line. (1-trip detection logic (Only output while a malfunction is present and the engine switch is on (IG).))

DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous).

Data List / Active Test

DATA LIST / ACTIVE TEST READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any ...

IG2 Signal Malfunction (B2788)

DESCRIPTION This DTC is stored when the steering lock ECU (steering lock actuator or upper bracket assembly) detects an IG2 power supply malfunction. HINT: The steering lock ECU (steering lock ac ...

Other materials:

Toyota CH-R Service Manual > Rear Seat Inner Belt Assembly(for Lh Side): Inspection
INSPECTION PROCEDURE 1. INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH (w/ Seat Belt Warning System) (a) for LH: (1) Check the resistance. Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection ...

Toyota CH-R Service Manual > Immobiliser System(w/o Smart Key System): Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may ...

Toyota CH-R Service Manual: Diagnostic Trouble Code Chart

Data List / Active Test

IG2 Signal Malfunction (B2788)

Other materials:

Toyota C-HR (AX20) 2023-2026 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual