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05-1834
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
05A23-02
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
(1) The ECM controls the function of the immobiliser system on the vehicle.
Data of the immobiliser system and the Diagnostic Trouble Code (DTC) can be read in the Data
Link Connector 3 (DLC3) of the vehicle. When trouble occurs in the immobiliser system, even
though the security Indicator lamp does not come on, DTCs can be checked.
Therefore, when the immobiliser system seems to be malfunctioning, use the hand-held tester
to check for a malfunction and repair it.
(b) Inspect the DLC3.
The vehicle's ECM uses the ISO 9141-2 communication
protocol. The terminal arrangement of the DLC3 complies
1 2 3 4 5 6 7 8 with the SAE J1962 and matches the ISO 9141-2 format.
9 10 11 12 13 14 15 16
DLC3
B50154
Standard:
Terminal No. Condition Specified Condition
7 (Bus + Line) - 5 (Signal ground) During communication Pulse generation
4 (Chassis Ground) - Body ground Always Below 1
5 (Signal Ground) - Body ground Always Below 1
16 (B+) - Body ground Always 10 to 14 V
HINT:
If the screen displays UNABLE TO CONNECT TO VEHICLE after you have connected the cable of the
hand-held tester to the DLC3, turned the ignition switch ON and used the hand-held tester, the problem
may be on the vehicle side or the tester side.
S If communication is normal when the tester is connected to other vehicle, inspect the DLC3 of the origi-
nal vehicle.
S If communication is still impossible when the tester is connected to another vehicle, the problem may
be in the tester itself, so consult the Service Department listed in the tester's instruction manual.
2. Using hand-held tester:
CHECK DTC
(a) Checking DTCs.
(1) Connect the hand-held tester to DLC3.
(2) Turn the ignition switch ON.
(3) Read DTCs by following the prompts on the tester screen.
HINT:
Refer to the hand-held tester operator's manual for further details.
(b) Clear the DTCs from memory.
(1) Connect the hand-held tester to DLC 3.
(2) Turn the ignition switch ON.
(3) Erase DTCs by following the prompts on the tester screen.
HINT:
Refer to the hand-held tester operator's manual for further details.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2017
05-1835
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
3. CHECK DIAGNOSIS
(a) Using the hand-held tester, check for DTCs.
NOTICE:
Hand-held tester only:
When the diagnosis system is switched from normal mode to check mode, all the DTCs and freeze
frame data recorded in the normal mode are erased. So before switching modes, always check the
DTCs and freeze frame data, and make a note of them.
(1) Prepare the hand-held tester.
(2) Connect the hand-held tester to the DLC3 under the instrument panel lower pad.
(3) Turn the ignition switch ON and push the hand-held tester switch ON.
(4) Use the hand-held tester to check for DTCs and freeze frame data, and make a note of them
(For operating instructions, see the hand-held tester instruction book).
(5) Confirm the details of the DTCs.
(b) Either of the following procedures will erase the DTCs and freeze frame data.
(1) Operating the hand-held tester to erase the codes (See the hand-held tester instruction book
for operating instructions).
(2) Disconnecting the battery terminals or ECU-B fuse.
4. DATA LIST
HINT:
Using to the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor,
actuator, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way
to shorten the labor time.
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Read the DATA LIST, according to the display on the tester.
Transponder key ECU assy:
Measurement Item/
Item Normal Condition Diagnostic Note
Display (Range)
Un-lock warning SW signal/ OFF: Key is in IG key cylinder
KEY SW -
ON or OFF ON: No key is in IG key cylinder
OFF: IG SW is ON or START
IG SW IG SW signal/ ON or OFF position -
ON: IG SW is OFF or ON position
Immobiliser system status/ UNSET: Without key
IMMOBILISER -
SET or UNSET SET: Ignition switch ON
Transponder chip data/ NG: Data error
RESPONSE -
NG or OK OK: Data OK
Transponder chip data/ NG: Data error
FRAME -
NG or OK OK: Data OK
Transponder chip data/ NG: Data error
SERIAL NUMBER -
NG or OK OK: Data OK
Transponder chip data/ NG: Data error
ENCRYPT CODE -
NG or OK OK: Data OK
Transponder chip data/ NG: Data error
STATUS -
NG or OK OK: Data OK
Transponder chip signal/ NG: Incorrect data sending
BCC -
NG or OK OK: Correct data sending
NOMATCH: Nomatch sub key
Sub key code signal/
SUB KEY code is sent -
NOMATCH or MATCH
MATCH: Sub key code is sent
NOMATCH: Nomatch Master key
Master key code signal/
MASTER KEY code is sent -
NOMATCH or MATCH
MATCH: Master key code is sent
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2018
05-1836
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM
Measurement Item/
Item Normal Condition Diagnostic Note
Display (Range)
Number of registered sub-key/
REGIST SUB CODE Number of registered sub-key -
min. 0, max. 15
Number of registered master key/
REGIST MAS CODE Number of registered master key -
min. 0, max. 15
NOT FUL: Possible to resister
Memory space for key codes
more key code
REG CODE SPACE registration/ -
FULL: Impossible to register key
NOT FUL or FULL
code any more
Antenna coil condition/ Normal: Antenna coil is normal
ANTENNA COIL -
NORMAL or FAIL FAIL: Antenna coil is abnormal
5. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand-held tester allows you to operate the relay, VSV, actuator,
etc. without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to
shorten the labor time.
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Perform the ACTIVE TEST, according to the display on the tester.
Transponder key ECU assy:
Item Test Details Diagnostic Note
SECURITY INDIC Turn security indicator ON/OFF -
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2019
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