Toyota Yaris: Networking / Network Gateway Ecu

Power Source Control System Missing Message (B278C87)

DESCRIPTION When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored. DTC No. Detection Item DTC Detection Condition Trouble Area B278C87 Power Source Control System Missing Message An internal malfunction occurs in the certification ECU (smart key ECU assembly)...

Components

COMPONENTS ILLUSTRATION *1 COWL SIDE TRIM BOARD RH *2 FRONT DOOR SCUFF PLATE RH *3 FRONT DOOR OPENING TRIM WEATHERSTRIP RH *4 GLOVE COMPARTMENT DOOR ASSEMBLY *5 LOWER NO...

Other information:

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Data List / Active Test

DATA LIST / ACTIVE TEST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1...

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Inspection

INSPECTION PROCEDURE 1. INSPECT STEERING WHEEL SWITCH HOUSING (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. *a Component without harness connected (Steering Wheel Switch Housing) - - Standard Resistance: Light Switch Circuit Tester Connection Condition Specified Condition z6-3 (T) - z4-3 (T) Always Below 1 Ω z6-12 (H) - z4-4 (H) Always Below 1 Ω z6-7 (A) - z4-5 (A) Always Below 1 Ω z6-16 (HU) - z4-6 (HU) Always Below 1 Ω z6-11 (HF) - z4-7 (HF) Always Below 1 Ω z6-8 (TR) - z4-8 (TR) Always Below 1 Ω z6-14 (TL) - z4-9 (TL) Always Below 1 Ω z6-6 (CR) - z4-10 (CR) Always Below 1 Ω z6-13 (BFG) - z4-11 (BFG) Always Below 1 Ω z6-4 (B) - z4-12 (B) Always Below 1 Ω z6-5 (EL) - z4-13 (EL) Always Below 1 Ω Wiper Switch Circuit Tester Connection Condition Specified Condition z5-10 (W_OFF) - z4-24 (W_OFF) Always Below 1 Ω z5-13 (+S) - z4-25 (+S) Always Below 1 Ω z5-11 (+1) - z4-26 (+1) Always Below 1 Ω z5-12 (+2) - z4-27 (+2) Always Below 1 Ω z5-14 (MIST) - z4-28 (MIST) Always Below 1 Ω z5-15 (WF) - z4-31 (WF) Always Below 1 Ω z5-5 (E) - z4-33 (E) Always Below 1 Ω z5-4 (VR) - z4-34 (VR) Always Below 1 Ω If the result is not as specified, replace the steering wheel switch housing...