Toyota Tundra (2015 year). Manual — part 2741
OK
(a) Disconnect the J2 main body ECU (driver side junction block) connector.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J2-10 (LIN2) - W3-3 (LIN)
Always
Below 1 Ω
J2-10 (LIN2) or W3-3 (LIN) - Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
4.
CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR - BATTERY AND
BODY GROUND)
MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM:...
OK
NEXT
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
W3-8 (E) - Body ground
Always
Below 1 Ω
Standard Voltage:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
W3-9 (IG) - Body ground
Ignition switch ON
11 to 14 V
W3-10 (B) - Body ground
Always
11 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
5.
REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY
.
(b) Clear the DTC
.
6.
CHECK FOR DTC
(a) Check for DTCs
.
Result:
MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM:...
RESULT
PROCEED TO
DTC B1273 output does not reoccur
A
DTC B1273 output reoccurs
B
B
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION
BLOCK)
A
END (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY
[SLIDING ROOF ECU] IS DEFECTIVE)
MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM:...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000002S8J04MX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: B2321; Driver Side Door ECU
Communication Stop; 2015 MY Tundra [08/2014 - ]
DTC
B2321
Driver Side Door ECU Communication Stop
DESCRIPTION
This DTC is output when LIN communication between the front power window regulator motor assembly LH and
main body ECU (driver side junction block) stops for 10 seconds or more.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
B2321
No communication between the front power window regulator
motor assembly LH and main body ECU (driver side junction
block) for 10 seconds or more.
Front power window
regulator motor
assembly LH
Main body ECU (driver
side junction block)
Harness or connector
WIRING DIAGRAM
MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM:...
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