2001 TOYOTA PRIUS Service Repair Manual

I17261
Gateway ECU
G1
GTX+MPD1
GTX±
MPD2
DI±766
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)Symbols (Terminals No.)
Wiring ColorConditionSTD Value (V)
IG e GNDBYWBIgnition switch OFF or ACCBelow 1 VIG e GND
(2 e 14)B±Y e W±BIgnition switch ON10 ± 14 V
MDP1 (4)GR±BA/C ECU communication circuit±
GTX+ (5)RAVC±LAN communication circuit±
CG e Body ground
(7 e Body ground)W±B e
Body groundConstantBelow 1 V
BATT e GND
(8 e 14)R±G e W±BConstant10 ± 14 V
ACC e GNDGR RWBIgnition switch OFFBelow 1 VACC e GND
(9 e 14)GR±R e W±BIgnition switch ACC or ON10 ± 14 V
MDP2 (11)GR±LEngine and ECT ECU communication circuit±
GTX± (12)GAVC±LAN communication circuit±
GND e Body ground
(14 e Body ground)W±B e
Body groundConstantBelow 1 V

DI1SJ±03
I15494
Body ECU P9
Power Window
Master SW
18
RX 6
B8
Y
Y5
IG1 MPX1
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±767
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
DTC B1211 / 11 Driver door ECU communication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between driver door ECU and body ECU.
DTC No.DTC Detecting ConditionTrouble Area
B1211/11No communication from driver door ECU more than 10 se-
Driver door ECUB1211/11No communication from driver door ECU more than 10 se
conds.

Driver door ECU

Wireharness
WIRING DIAGRAM

DI±768
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check driver door ECU.
CHECK:
Check if the driver door window glass auto up.
HINT:
With this inspection, the driver door ECU CPU can be diagnosed if it works normally or not.
NG Replace the driver door ECU.
OK

I15549
Body ECU
RX
MPX1 Driver
Door
ECU
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±769
2001 PRIUS (RM778U)
2 Check wireharness.
PREPARATION:
Disconnect connector ºB8º of body ECU and ºP9º of driver door
ECU.
CHECK:
Check continuity between terminal RX of body ECU and MPX1
of driver door ECU.
OK:
There is a continuity in wireharness.
HINT:
If there is OPEN in wireharness, please repair it.
NG Repair or replace wireharness.
OK
Replace the driver door ECU.

I15498
Body ECU W5
Wireless Door Control Receiver (Tuner)
5
S
PRG B9
B89
7
3R±G
B±R +B
2
RDA
B88
L J27
J/C
R±G
PRG
RDAFF
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±771
2001 PRIUS (RM778U)
DTC B1242 / 42 Wireless door lock tuner circuit mal-
function
CIRCUIT DESCRIPTION
This DTC is output when GND short of RDA terminal is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1242/42GND short of RDA terminal

Wireharness

Wireless door lock tuner

Body ECU
WIRING DIAGRAM
DI1SS±05

I03347
Tuner
Body ECU RDA
I03348
Tuner
Body ECU
DI±772
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check wireharness.
PREPARATION:
Disconnect the connector of tuner and body ECU.
CHECK:
Check the continuity between wireharness and body ground.
OK:
No continuity.
NG Repair or replace the wireharness.
OK
2 Check body ECU.
PREPARATION:
Connect the connector of body ECU.
CHECK:
Check the DTC.
OK:
B1242/42 is not output.
NG Replace the body ECU.
OK
Replace the tuner.