2001 TOYOTA PRIUS Service Repair Manual

DI±754
± DIAGNOSTICSDRIVER DOOR CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check jam protection pulse switch (See page BE±56).
NG Replace the power window motor.
OK
2 Check wireharness and connector between jam protection pulse switch and
driver door ECU.
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI±734).

DI1SF±03
I15526
ECM
Body ECUDLC3
Gateway ECU
Power Window Master Switch
(Driver Door Control ECU)A/C Amplifier
Combination Meter
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±757
2001 PRIUS (RM778U)
PRE±CHECK
1. DIAGNOSIS SYSTEM
(a) As shown in the following illustration, each ECU of this ve-
hicle is connected by communication bus and it transmits
each signal by communication. This communication bus
is self±diagnosed by Body ECU and it memorizes DTC
when it detects communication stop to ECU or commu-
nication bus +B short or GND short. There is a possibility
that Body ECU cannot self±diagnose accurately unless
it doesn't work normal. So, please note that the trouble-
shooting of Body Electrical System should be done after
confirming if Body ECU and Open door indicator works
normal by 2. ºBASIC INSPECTIONº described later.

I03343I03344I03345I03977
ECU
ECU
ECU
ECU
ECU
ECU OpenOpen
ECU
ECU
Open
ECU Disconnection (DTC is detected)
Open (DTC is detected)
Open (DTC is not detected)
I03346
Body ECU
OpenOpen
Detect the DTC of commu-
nication stop of the 3 ECUs. Example
DI±758
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
(b) If DTC of ECU communication stop is output, there is a
possibility of connector disconnection or 2 communica-
tion buses open. It will not become abnormal with only 1
communication bus open.
(c) If 2 communication buses are open at the position as
shown in the illustration, DTC of ECU communication stop
between those 2 buses is output.

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±759
2001 PRIUS (RM778U)
2. BASIC INSPECTION
INSPECT BODY ECU
1 Check room light operation.
HINT:
With this inspection body ECU CPU can be diagnosed if it works normal or not.
CHECK:
Check if the room light works normal at DOOR position.
OK Go to next stepºOPEN DOOR INDICATOR LIGHT
INSPECTIONº.
NG
2 Check interior light system (Except body ECU) (See page BE±27).
OK Replace the body ECU.
NG
Repair of replace malfunction part.

I15594
A04550
Tc CG
DLC3
DI±760
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
INSPECT OPEN DOOR INDICATOR LIGHT
1 Check open door indicator light.
CHECK:
Check if open door Indicator light is turned on when either door
open.
HINT:
If open door Indicator light is not turned on, DTC will not be out-
put.
OK Go to step 3. ºDTC CHECKº.
NG
Repair the open door indicator light (See
page BE±39).
3. DTC CHECK (Using diagnosis check wire)
(a) Using SST, connect terminals Tc and CG of DLC3.
SST 09843±18020
(b) Turn the ignition switch ON.
(c) Read the DTC on the open door indicator light.

N13628
Malfunction Code 12
Malfunction Code 11 and 12
0.25 sec.
0.25 sec.
1.5 sec.
Normal Code
4.5 sec.
0.5 sec. 0.5 sec.
2.5 sec. 4.5 sec.
F12396
DLC3
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±761
2001 PRIUS (RM778U)
As an example, the blinking patterns for codes; normal, 12, and
11 and 12 are shown in the illustration.
(d) Check for the problem using the DTC table on the next
page.
(e) After completing the check, turn the ignition switch off,
and disconnect terminals Tc and E1.
4. DTC CHECK (Using hand±held tester)
(a) Prepare the hand±held tester.
(b) Connect the hand±held tester to DLC3.
(c) Turn the ignition switch ON and switch the hand±held tes-
ter main switch ON.
(d) Use the hand±held tester to check the DTCs, note them
down. (For opening instructions, see the hand±held tes-
ter 's instruction book.)
(e) See page DI±757 to confirm the details of the DTCs.
5. DTC CLEARANCE
DTC will be cleared when the trouble output to DTC is recov-
ered normally.