NHTSA ID Number: 10133826
Manufacturer Communication Number: T-SB-0018-13
TSB/Document Date: 2018-04-23
Summary
Some 2012 model year Prius C vehicles may exhibit one or more of the following conditions: ABS
and TRC MIL ?ON? with DTC B2321. Keyless Entry and Smart Key features are inoperative. Vehicle interior door lock/unlock switches are inoperative. Multi-Display may show the incorrect door is opened. Shift Position Linked Door Locking Function may not operate, not locking the doors when the shift position is moved out of ?P? position. If any of these conditions are exhibited and the vehicle is able to ?Ready? On (key may need to be held over the ignition button), the Main Body ECU may require replacement.
T-SB-0018-13
February 5, 2013
Main Body ECU Improvement
Service
Category
Power Source/Network
Section
Networking
Market
USA
Applicability
YEAR(S)
MODEL(S)
2012
Prius C
ADDITIONAL INFORMATION
Introduction
Some 2012 model year Prius C vehicles may exhibit one or more of the following conditions:
• ABS and TRC MIL “ON” with DTC B2321.
• Keyless Entry and Smart Key features are inoperative.
• Vehicle interior door lock/unlock switches are inoperative.
• Multi-Display may show the incorrect door is opened.
• Shift Position Linked Door Locking Function may not operate, not locking the doors when the
shift position is moved out of “P” position.
If any of these conditions are exhibited and the vehicle is able to “Ready” On (key may need to be
held over the ignition button), the Main Body ECU may require replacement.
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EL1225
R & R Main Body ECU
0.7
89220-52520
87
74
APPLICABLE WARRANTY
• This repair is covered under the Toyota Basic Warranty. This warranty is in effect for 36 months
or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.
• Warranty application is limited to occurrence of the specified condition described in this
bulletin.
© 2013 Toyota Motor Sales, USA
Page 1 of 6
February 5, 2013
T-SB-0018-13
Page 2 of 6
Main Body ECU Improvement
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs shown
below.
MODEL
PLANT
Prius C
Kanto
LINE
DRIVETRAIN
1
2
PRODUCTION CHANGE EFFECTIVE VIN
JTDKDTB3#C1026781
CVT-E
JTDKDTB3#C1521900
Parts Information
PREVIOUS PART NUMBER
CURRENT PART NUMBER
89220-52520
89220-52521
89220-52530
89220-52531
PART NAME
QTY
Computer Assembly, Multiplex Network
1
1
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
Techstream 2.0*
TIS Techstream
PART NUMBER
QTY
TS2UNIT
ADE
Techstream Lite
TSPKG1
TSLITEDLR01
* Essential SST.
NOTE
• Only ONE of the Techstream units listed above is required.
• Software version 8.00.034 or later is required.
• Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE) at
1-800-368-6787.
© 2013 Toyota Motor Sales, USA
1
T-SB-0018-13
February 5, 2013
Page 3 of 6
Main Body ECU Improvement
Repair Procedure
1. Confirm the vehicle is able to “Ready” On and exhibits one or more of the conditions described in
the Introduction.
2. Disconnect the negative (–) cable from the battery terminal.
CAUTION
Wait at LEAST 90 seconds after disconnecting the battery cable to prevent possible airbag
deployment.
3. Remove Lower Instrument Panel Finish Panel LH.
Figure 1.
Disengage the 9 claws and remove the lower
instrument panel finish panel LH as shown in
Figure 1.
© 2013 Toyota Motor Sales, USA
.
February 5, 2013
T-SB-0018-13
Main Body ECU Improvement
Repair Procedure (Continued)
4. Remove Instrument Panel Junction Block Assembly.
A. Disengage the clamp.
B. Disconnect the connector.
C. Disengage the 2 claws and disconnect the 2 connectors.
D. Remove the 2 bolts.
Figure 2.
Figure 3. Bolt Location
1
1
1
1
Connector
5. Remove the Main Body ECU.
Figure 4.
© 2013 Toyota Motor Sales, USA
.
Page 4 of 6
T-SB-0018-13
February 5, 2013
Page 5 of 6
Main Body ECU Improvement
Repair Procedure (Continued)
A. Press the claw of the Junction Block as shown
in the illustration to release the lock.
Figure 5.
.
1
2
B. With the Junction Block lock released, insert a
screwdriver with its tip wrapped with protective
tape horizontally between the Main Body ECU
(Multiplex Network Body ECU) and Junction
Block.
1
Instrument Panel Junction Block
2
Main Body ECU (Multiplex Network Body ECU)
Figure 6.
.
1
1
© 2013 Toyota Motor Sales, USA
Protective Tape
February 5, 2013
T-SB-0018-13
Page 6 of 6
Main Body ECU Improvement
Repair Procedure (Continued)
C. Using the taped screwdriver, carefully raise
the Main Body ECU (Multiplex Network Body
ECU) up to the position where the connector
becomes disengaged.
Figure 7.
.
1
NOTICE
Do NOT twist the screwdriver to raise the
main body ECU.
2
D. Raise the Main Body ECU (Multiplex Network Body ECU) as shown by arrow 1, and then pull
it out as shown by arrow 2 in the illustration.
NOTICE
Do NOT touch the ECU connector.
6. Install in the reverse order of removal.
7. When installing the Instrument Panel Junction Block Assembly retaining bolts tighten to the
following specifications.
Torque: 5.5 N*m (56 kgf*cm, 49 in*lbf)
8. Verify all systems operated properly and initialize any systems that may require initialization.
© 2013 Toyota Motor Sales, USA
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TSB/Document ID: T-SB-0018-13
Replacement Service Bulletin Number:
MFR Communication Date: 2013-02-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE
MFR Component System:
MFR Component Subsystem:
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