TOYOTA PRIUS 2001 Service Repair Manual

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.

I15475
Multi DisplayG1
Gateway ECU
TX3+
TX3±M5
M54
11RR
G
G
12GTX+
5
GTX±
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±773
2001 PRIUS (RM778U)
DTC B1248/48 AVC±LAN circuit communication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between gateway ECU and AVC±LAN circuit.
The body ECU performs the diagnosis check of the gateway ECU communication error to ºAVC±LANº.
The condition of registration can be checked by DTC of the body ECU.
DTC No.DTC Detecting ConditionTrouble Area
B1248/48C diti th t th t ECU t i t t AVC LAN
Gateway ECUB1248/48Condition that the gateway ECU cannot register to AVC±LAN.
Gateway ECU

Wireharness
WIRING DIAGRAM
DI7O2±01

I15538
Multi Display
TX3+
TX3±
Gateway ECU
GTX+
GTX±
DI±774
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check ºService check modeº of audio sysytem. (AVC±LAN diagnosis check)
(See page DI±791)
CHECK:
Connection of the gateway ECU can be checked by AVC±LAN diagnosis. (ºService check modeº of audio
sysytem)
OK:
Display
G/W: OK (Sysytem is normal)
G/W: NG (Communication error)
G/W: None (Never registered)
NG Replace the gateway ECU.
OK
2 Check wireharness
PREPARATION:
Disconnect connector ºG1º of gateway ECU and ºM2º of multi
display.
CHECK:
(a) Check continuity between terminals GTX+ of gateway
ECU and TX3+ of multi display.
(b) Check continuity between terminals GTX± of gateway
ECU and TX3± of multi display.
OK:
There is a continuity in wireharness of both (a) and (b), or either
(a) or (b).
HINT:
If there is OPEN in wireharness of either (a) or (b), please repair
it.
NG Repair or replace wireharness.
OK
Replace the gateway ECU.

I15474
GR±B4 A7
A/C Amplifier C11
Combination MeterG1
Gateway ECU
B8
Body ECUE10
Engine Control Module
15MP2+
MPX+ GR4 11
3 2
MPX+MPX±
MPX+ MPX±
MPX2MPX1 GR±B
1613
GRGR±L11
14MPD1
MPD2
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±775
2001 PRIUS (RM778U)
DTC B1261 / 61 ECM communication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between ECM and body ECU.
DTC No.DTC Detecting ConditionTrouble Area
B1261/61N i ti f ECM th 10 d
ECMB1261/61No communication from ECM more than 10 seconds.
ECM

Wireharness
WIRING DIAGRAM
DI1SV±05

DI±776
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check ECM.
CHECK:
Check that the engine starts normally.
HINT:
With this inspection, ECM CPU can be diagnosed if it works normally or not.
NG Replace the ECM.
OK

I15537
Body ECU
MPX±
ECM
MPX1
Gateway
ECU
MPX1 MPX2
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±777
2001 PRIUS (RM778U)
2 Check wireharness
PREPARATION:
Disconnect connector ºB8º of body ECU, ºE11º of ECM and
ºG1º of gateway ECU.
CHECK:
(a) Check continuity between terminals MPX± of body ECU
and MPX2 of ECM.
(b) Check continuity between terminals MPX1 of ECM and
MPX1 of gateway ECU.
OK:
There is a continuity in wireharness of both (1) and (2), or either
(1) or (2).
HINT:
If there is OPEN in wireharness of either (1) or (2), please repair
it.
NG Repair or replace wireharness.
OK
Replace the ECM.

I15474
GR±B4 A7
A/C Amplifier C11
Combination MeterG1
Gateway ECU
B8
Body ECUE11
Engine Control Module
15MP2+
MPX+ GR4 11
3 2
MPX+MPX±
MPX1 MPX±
MPX2MPX1 GR±B
1613
GRGR±L11 14
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±779
2001 PRIUS (RM778U)
DTC B1266 / 66 Instrument panel system communica-
tion bus malfunction (+B short)
DTC B1267 / 67 Instrument panel system communica-
tion bus malfunction (GND short)
CIRCUIT DESCRIPTION
This DTC is output when +B or GND short occurs on instrument panel system communication bus. If +B or
GND short is detected on instrument panel system communication bus, separate it by bus cut relay in body
ECU to prevent while communication buses' failure.
WIRING DIAGRAM
DI7O3±01

I15546
ECM
E11
I15545
Gateway
ECU
G1
DI±780
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
HINT:
On the system structure point of view, this DTC cannot display meter. In case of checking DTC, please use
hand±held tester.
1 Check the communication circuit inside ECM.
PREPARATION:
Disconnect the connector ºE11º of ECM.
CHECK:
Check the DTC.
OK:
Code B1266 or B1267 is not output
OK Replace the ECM.
NG
2 Check the communication circuit inside gateway ECU.
PREPARATION:
(a) Connect the connector ºE11º of ECM.
(b) Disconnect the connector ºG1º of gateway ECU.
CHECK:
Check the DTC.
OK:
Code B1266 or B1267 is not output
OK Replace the gateway ECU.
NG

I15544
A/C
Amplifier
A7
I15543
Combination
Meter
C11
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±781
2001 PRIUS (RM778U)
3 Check the communication circuit inside A/C amplifier.
PREPARATION:
(a) Connect the connector of ºG1º of gateway ECU.
(b) Disconnect the connector ºA7º of A/C amplifier.
CHECK:
Check the DTC.
OK:
Code B1266 or B1267 is not output
OK Replace the A/C amplifier.
NG
4 Check the communication circuit inside combination meter ECU.
PREPARATION:
(a) Connect the connector ºA7º of A/C amplifier.
(b) Disconnect the connector ºC11º of combination meter
ECU.
CHECK:
Check the DTC.
OK:
Code B1266 or B1267 is not output
OK Replace the combination meter ECU.
NG