Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Lost Communication with Power Source Control (B278C)

Toyota Tacoma 2015-2018 Service Manual / Multiplex Communication / Lin Communication System / Lost Communication with Power Source Control (B278C)

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

B278C

An internal malfunction occurs in the certification ECU (smart key ECU assembly)

  • Certification ECU (smart key ECU assembly)

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the vehicle ignition switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • If the certification ECU (smart key ECU assembly) is replaced, register the keys (See page ).

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).

NEXT

2.

CHECK FOR DTC

(a) Check for DTCs (See page OK: ).

OK:

DTC B278C is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

P/W Master Switch Communication Stop (B1206)
DESCRIPTION This DTC is stored when LIN communication between the power window regulator master switch assembly and main body ECU (multiplex network body ECU) stops for 10 seconds or more. ...

Front Passenger Side Door ECU Communication Stop (B2322)
DESCRIPTION This DTC is stored when LIN communication between the front power window regulator motor assembly RH and main body ECU (multiplex network body ECU) stops for 10 seconds or more. ...

Other materials:

Operation Check
OPERATION CHECK 1. CHECK INTERMITTENT CONTROL FUNCTION (w/ Intermittent Time Adjustment Switch) (a) Turn the ignition switch to ON. (b) Turn the windshield wiper switch assembly to the INT position. (c) Check that the intermittent operation interval can be adjusted from approximately 1.6 to 10 ...

Installation
INSTALLATION CAUTION / NOTICE / HINT CAUTION: Be sure to perform this procedure with several people as the transfer assembly is very heavy. PROCEDURE 1. INSTALL TRANSFER CASE LOWER PROTECTOR (a) Install the transfer case lower protector with the 4 bolts. Torque: 18 N·m {184 kgf·cm, 13 f ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. (e) Check for DTCs. 2. CLEAR DTC (a) Connect the Techstream to the DLC3. ( ...

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