RM3660EC _57 Power Source / Network _080743 NETWORKING _0600577 LIN COMMUNICATION SYSTEM(for NR Series Engine) C

NETWORKING  LIN COMMUNICATION SYSTEM(for NR Series Engine)  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)

·

Wire harness or connector

·

STRG LOCK fuse



WIRING DIAGRAM

B445874E22
4.917,0.406 6.417,0.76 1.5,0.354 10 false from Battery 5.156,0.948 5.563,1.24 0.406,0.292 10 false 7 5.469,1.229 6.365,1.625 0.896,0.396 10 false STRG LOCK 4.979,1.073 5.385,1.365 0.406,0.292 10 false B 4.771,2 5.177,2.292 0.406,0.292 10 false GND 5.167,1.885 5.573,2.177 0.406,0.292 10 false 1 4.229,1.469 4.635,1.76 0.406,0.292 10 false LIN 4.042,1.323 4.448,1.615 0.406,0.292 10 false 5 2.146,1.323 2.552,1.615 0.406,0.292 10 false 14 0.938,2.365 1.344,2.656 0.406,0.292 10 false I1 0.927,2.531 2.458,3.073 1.531,0.542 10 false Certification ECU (Smart Key ECU Assembly) 0.656,3.469 2.688,3.698 2.031,0.229 10 false : LIN Communication Line 3.625,2.385 4.573,2.646 0.948,0.26 10 false I59 3.615,2.542 6.292,3.094 2.677,0.552 10 false Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly) 1.844,1.469 2.25,1.76 0.406,0.292 10 false LIN

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

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 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

·

Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upper bracket assembly), refer to Service Bulletin.



PROCEDURE

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

Disconnect the I1 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.


c.

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.


Standard Resistance:
Tester Connection Condition Specified Condition
I1-14 (LIN) - I59-5 (LIN) Ignition switch off Below 1 Ω
I1-14 (LIN) or I59-5 (LIN) - Body ground Ignition switch off 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - BATTERY, BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - BATTERY, BODY GROUND)
a.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I59-7 (B) - I59-1 (GND) Always 11 to 14 V



b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I59-1 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
a.

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

Click hereSteering>STEERING COLUMN>STEERING COLUMN ASSEMBLY>DISASSEMBLY


Result:
Proceed to
NEXT



NEXT

4.REGISTER ECU CODE REGISTRATION
4.REGISTER ECU CODE REGISTRATION
a.

Register the recognition codes in the ECUs.

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

5.CHECK FOR DTC
5.CHECK FOR DTC
a.

Clear the DTCs.

Body Electrical > Entry&Start > Clear DTCs
50002 125

b.

Recheck for DTCs.

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

DTC B2786 is not output.



Result:
Proceed to
OK
NG



OK

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

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)