RM35X0E _57 Power Source / Network _078518 NETWORKING _0388279 LIN COMMUNICATION SYSTEM C

NETWORKING  LIN COMMUNICATION SYSTEM  B2786  No Response from Steering Lock ECU  


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. Detection Item DTC Detection Condition Trouble Area
B2786 No Response from Steering Lock ECU 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.
·

Certification ECU (smart key ECU assembly)

·

Steering lock ECU (steering lock actuator or upper bracket assembly)

·

Harness or connector



WIRING DIAGRAM

B498108E03
0.438,1.365 2.302,1.74 1.865,0.375 10 false Certification ECU (Smart Key ECU Assembly) 0.438,1.198 0.896,1.396 0.458,0.198 10 false N156 1.927,0.927 2.385,1.125 0.458,0.198 10 false LIN 2.281,0.771 2.594,0.969 0.313,0.198 10 false 13 5.26,0.76 5.573,0.958 0.313,0.198 10 false 5 2.677,1.708 4.115,2 1.438,0.292 10 false from Battery 2.208,2.365 3.625,2.656 1.417,0.292 10 false from IG2-NO.2 Relay 3.979,1.542 4.802,1.719 0.823,0.177 10 false STRG LOCK 4.063,2.198 5.156,2.417 1.094,0.219 10 false IG2 NO.2 5.26,1.625 5.417,1.823 0.156,0.198 10 false 7 5.26,2.292 5.417,2.49 0.156,0.198 10 false 6 5.281,3.104 5.438,3.302 0.156,0.198 10 false 1 0.823,4.448 3.073,4.708 2.25,0.26 10 false : LIN Communication Line 4.625,3.781 5.573,4 0.948,0.219 10 false N157 4.625,3.938 7.073,4.281 2.448,0.344 10 false Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly) 5.479,3.219 5.938,3.417 0.458,0.198 10 false GND 5.49,2.375 5.948,2.573 0.458,0.198 10 false IG2 5.479,1.729 5.635,1.927 0.156,0.198 10 false B 5.479,0.906 5.938,1.104 0.458,0.198 10 false LIN

CAUTION / NOTICE / HINT

NOTICE:
·

When using the GTS with the ignition switch off to troubleshoot:

Connect the GTS to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

·

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

·

Before replacing the certification ECU (smart key ECU assembly) or steering lock actuator assembly, refer to the entry and start system (for start function).



HINT:

When the communication between the steering lock actuator or upper bracket assembly and certification ECU (smart key ECU assembly) stops, DTC B2785 is also stored.


PROCEDURE

1.CHECK FOR DTC
a.

Clear the DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Entry&Start > Clear DTCs
50002 125

b.

Recheck for DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Entry&Start > Trouble Codes
50001 125
OK:

DTC B2786 is not output.



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

2.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY - BATTERY AND BODY GROUND)
2.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY - BATTERY AND BODY GROUND)
a.
C391576C06
0.125,1.052 0.51,1.281 0.385,0.229 0.625,0.49 0.792,0.49 0.792,0.49 1.042,1.073 true 1.667,0.417 1.833,0.417 1.833,0.417 2.083,1.083 true 2.573,0.281 2.406,0.281 2.406,0.281 2.302,1.094 true 0.073,0.115 0.385,0.313 0.313,0.198 10 false *a 0.167,1.083 0.573,1.333 0.406,0.25 10 false N157 0.323,0.438 0.677,0.635 0.354,0.198 10 false GND 1.417,0.354 1.771,0.552 0.354,0.198 10 false IG2 2.615,0.208 2.969,0.406 0.354,0.198 10 false B
*a Front view of wire harness connector
(to Steering Lock ECU [Steering Lock Actuator or Upper Bracket Assembly])


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


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N157-1 (GND) - Body ground Always Below 1 Ω



c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
N157-7 (B) - Body ground Always 11 to 14 V
N157-6 (IG2) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
a.

Disconnect the N156 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the N157 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
N156-13 (LIN) - N157-5 (LIN) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

Click hereSteering>STEERING COLUMN>STEERING COLUMN ASSEMBLY>DISASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR