DTC B2788: IG2 Signal Malfunction [08/2019 - ]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Sequoia, 2021 Toyota Sequoia, and 2020 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HARNESS AND CONNECTOR (POWER SOURCE MODE SIGNAL AND BODY GROUND)

Disconnect the steering lock ECU (upper steering column with switch bracket assembly) connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Steering Lock ECU (Upper Steering Column with Switch Bracket Assembly))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H196-1 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
H196-6 (IG2) - H196-1 (GND)	Engine switch on (IG)	11 to 14 V
H196-6 (IG2) - H196-1 (GND)	Engine switch off	Below 1 V

Result

Proceed to
OK
NG

Result:

REPLACE STEERING LOCK ECU (UPPER STEERING COLUMN WITH SWITCH BRACKET ASSEMBLY)

for Power Tilt and Power Telescopic Steering Column:

Refer to DISASSEMBLY [08/2019 - ]

for Manual Tilt and Manual Telescopic Steering Column:

Refer to DISASSEMBLY [08/2019 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR