Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: No Response from Steering Lock ECU (B2786)

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or upper bracket assembly) stops for 10 seconds or more.

DTC No.

DTC Detection Condition

Trouble Area

B2786

No communication between steering lock ECU (steering lock actuator or upper bracket assembly) and certification ECU (smart key ECU assembly) for 10 seconds or more.

  • Steering lock ECU (steering lock actuator or upper bracket assembly)
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • If the certification ECU (smart key ECU assembly) is replaced, register the keys (See page If the steering lock ECU (steering lock actuator or upper bracket assembly) ).
  • If the steering lock ECU (steering lock actuator or upper bracket assembly) is replaced, register the ECU code (See page When using the Techstream with the vehicle ignition switch off, connect ).
  • 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.

PROCEDURE

1.

CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Recheck for DTCs. ).

(b) Recheck for DTCs.

Result

Proceed to

Only B2786 is output

A

DTC B2786 and B2785 are output simultaneously

B

HINT:

When DTC B2786 and B2785 are output simultaneously, perform troubleshooting for DTC B2785 first.

B

GO TO DTC B2785

A

2.

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - POWER SOURCE CIRCUIT)

(a) Disconnect the S45 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S45-1 (GND) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

S45-7 (B) - Body ground

Always

11 to 14 V

S45-6 (IG2) - Body ground

Ignition switch ON

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY))

(a) Disconnect the C29 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the S45 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C29-6 (LIN) - S45-5 (LIN)

Always

Below 1 Ω

C29-6 (LIN) or S45-5 (LIN) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Replace the steering lock ECU (steering lock actuator or upper bracket assembly) (See page ).

NEXT

5.

CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Recheck for DTCs. ).

(b) Recheck for DTCs.

OK:

DTC B2786 is not output.

OK

END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Communication Malfunction between ECUs Connected by LIN (B2785)
DESCRIPTION The certification ECU (smart key ECU assembly) monitors communication between all the ECUs connected to the certification bus lines. When the certification ECU (smart key ECU assembly ...

Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Main Body ECU (Multiplex Network Body ECU) DTC Code Detection Item See page B1206 P/W Master Switch Communi ...

Other materials:

Using the interior lights
Interior lights list Interior light Personal lights (Access Cab and Double Cab models) ■Illuminated entry system When the interior light switch is in the DOOR position, the interior light automatically turns on/off according to whether the doors are locked/unlocked and whether the ...

Voice Recognition Microphone Disconnected (B1579)
DESCRIPTION The radio and display receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines. This DTC is stored when a microphone connection detection signal line is disconnected. DTC Code DTC Det ...

Precaution
PRECAUTION PRECAUTION WHEN REPLACING COMBINATION METER ASSEMBLY (a) When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from ...

© 2011-2024 Copyright www.ttguide.net