Page 1097 of 2572

- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
05-2007
2197 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using the
hand-held tester.
1 READ VALUE OF HAND-HELD TESTER
(IMMOBILISER ECU (TRANSPONDER KEY ECU ASSY) (SWITCH CONDITION))
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON with the key that does not start the engine.
(c) Select the item ºIMMOBILIZERº on the hand-held tester.
OK: ºSETº (Ignition switch ON) appears on the screen.
ItemMeasurement Item/
Display (Range)Normal ConditionDiagnostic Note
IMMOBILIZERImmobilizer system status
/SET or UNSETUNSET: Without key
SET: Ignition switch ON-
OK NORMAL
NG
2 CHECK WHETHER ENGINE STARTS WITH OTHER KEYS
(a) Check whether the engine starts with the other keys for the vehicle.
OK RE-REGISTER OR REPLACE KEY THAT WILL
NOT START ENGINE
NG
HINT:
Start the inspection from step 3 when using the hand-held tester and start from step 4 when not using the
hand-held tester.
3 READ VALUE OF HAND-HELD TESTER
(IMMOBILIZER ECU (TRANSPONDER KEY ECU ASSY) (SWITCH CONDITION))
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON with the key that does not start the engine.
(c) On the hand-held tester, select the following menu item: DIAGNOSIS/ENHANCED OBD II/DATA
LIST/IMMOBILIZER/ANTENNA COIL. Read the values.
OK: ºNORMALº (Antenna coil is normal) appears on the screen.
ItemMeasurement Item/
Display (Range)Normal ConditionDiagnostic Note
ANTENNA COILAntenna coil condition
/NORMAL or FAILNORMAL: Antenna coil is normal
FAIL: Antenna coil is abnormal-
NG CHECK AND REPLACE TRANSPONDER KEY
ECU ASSY
OK
Page 1098 of 2572

B55013B63404B55013B63404B64974
T7
Transponder Key Amplifier Wire Harness Side
T14
Transponder Key ECU Assy
05-2008
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
2198 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4 CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - TRANSPONDER KEY
AMPLIFIER) (TRANSPONDER KEY ECU ASSY OR TRANSPONDER KEY AMPLIFI-
ER - BODY GROUND)
(a) Disconnect the T14 ECU and T7 amplifier connectors.
(b) Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
T14-8 (VC5) - T7-1 (VC5)Below 1 W
T14-1 1 (CODE) - T7-4 (CODE)Below 1 W
T14-12 (TXCT) - T7-5 (TXCT)Below 1 W
T14-13 (AGND) - T7-7 (GND)Below 1 W
T14-8 (VC5) or T7-1 (VC5) -
Body ground10 kW or higher
T14-1 1 (CODE) or T7-4 (CODE) -
Body ground10 kW or higher
T14-12 (TXCT) or T7-5 (TXCT) -
Body ground10 kW or higher
T14-13 (AGND) or T7-7 (GND) -
Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
5 CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning amplifier, check that the en-
gine starts.
NG REPLACE TRANSPONDER KEY ECU ASSY
OK
REPLACE TRANSPONDER KEY AMPLIFIER
Page 1099 of 2572
B52550
T7
Transponder Key AmplifierT14
Transponder Key ECU Assy
GR
CODE
411CODE
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
05-2009
2199 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B2797 COMMUNICATION MALFUNCTION NO.1
CIRCUIT DESCRIPTION
This DTC is output when an error occurs in normal communication.
HINT:
Some noise exists in the communication line.
DTC No.DTC Detection ConditionTrouble Area
B2797Keys are positioned too close to each other, or noise oc-
curred in communication line
Key
Wire harness
Transponder key amplifier
Transponder key ECU assy
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning amplifier, check that the en-
gine starts.
OK NORMAL
(TRANSPONDER KEY AMPLIFIER DEFECTIVE)
NG
REPLACE TRANSPONDER KEY ECU ASSY
052IL-10
Page 1100 of 2572

B66227
E6
ECMT14
Transponder Key ECU Assy
IMI
IMO6
7EFIO
EFII 27
26V B 05-2010
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
2200 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B2799 ENGINE IMMOBILIZER SYSTEM
MALFUNCTION
CIRCUIT DESCRIPTION
This DTC is output when the ECM detects errors in communication between the transponder key ECU assy
and the ECM, or in the communication lines.
This DTC is also output when an engine start is attempted while the ECU communication ID between the
transponder key ECU assy and the ECM is different.
Before troubleshooting for this DTC, make sure that there is no DTC detected in the transponder key ECU.
If there is a key code-related DTC detected in the transponder key ECU assy, repair it first.
DTC No.DTC Detection ConditionTrouble Area
B2799
Error in communication between ECM and transponder
key ECU assy, and in communication line
Communication ID is different during communication with
transponder key ECUWire harness
Transponder key ECU assy
Transponder key amplifier
ECM
WIRING DIAGRAM
052IM-12
Page 1101 of 2572

B66220 YB66220 YB66229
T14
Transponder Key ECU Assy
E6
ECM Wire Harness Side
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
05-201 1
2201 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - ECM)
(TRANSPONDER KEY ECU ASSY OR ECM - BODY GROUND)
(a) Disconnect the T14 ECU and E6 ECM connectors.
(b) Measure the resistance between the wire harness side
connectors.
Standard:
Symbols (Terminal No.)Specified Condition
EFIO (T14-6) - IMI (E6-27)Below 1 W
EFII (T14-7) - IMO (E6-26)Below 1 W
(c) Measure the resistance between the T14 or E6 wire har-
ness side connector and the body ground.
Standard:
Symbols (Terminal No.)Specified Condition
EFIO (T14-6) or IMI (E6-27) -
Body ground10 kW or higher
EFII (T14-7) or IMO (E6-26) -
Body ground10 kW or higher
OK REPAIR OR REPLACE HARNESS AND
CONNECTOR
NG
2 CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning amplifier, check that the en-
gine starts.
NG REPLACE TRANSPONDER KEY ECU ASSY
OK
NORMAL (TRANSPONDER KEY AMPLIFIER DEFECTIVE)
Page 1102 of 2572

H10600H10600H10600H41086
DLC3DTC B1100/31
CG
TC
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1319
1509 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1100/31 AIRBAG SENSOR ASSY CENTER
MALFUNCTION
CIRCUIT DESCRIPTION
The airbag sensor assy center consists of a airbag sensor assy center, safing sensor, drive circuit, diagnosis
circuit and ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and detects
diagnosis system malfunction.
DTC B1100/31 is recorded when occurrence of a malfunction in the airbag sensor assy center is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1100/31Airbag sensor assy center malfunctionAirbag sensor assy center
HINT:
When a trouble code is displayed simultaneously with B1100/31, repair the malfunction indicated by this
code (except B1100/31) first.
INSPECTION PROCEDURE
1 CHECK AIR BAG SENSOR ASSY CENTER
(a) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(b) Clear the DTCs stored in memory (see page 05-1215).
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(e) Check the DTCs (see page 05-1215).
OK:
DTC B1100/31 is not output.
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-53)
OK
USE SIMULATION METHOD TO CHECK
05IVG-01
Page 1103 of 2572

H40997
DLC3DTC B1135/24
CG
TCAirbag
Sensor
Assy
Center
05-1320
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1510 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1135/24 HALF CONNECTION IN AIRBAG SENSOR
ASSY CENTER CONNECTORS
CIRCUIT DESCRIPTION
The airbag sensor assy center detects partial connection of connector.
DTC B1135/24 is recorded when the airbag sensor assy center detects an open in the electrical connection
check mechanism of the airbag sensor connector or in the airbag sensor circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1135/24
Malfunction of electrical connection check mechanism of
airbag sensor assy center connector
Airbag sensor assy center malfunctionElectrical connection check mechanism
Airbag sensor assy center
INSPECTION PROCEDURE
1 CHECK AIRBAG SENSOR ASSY CENTER CONNECTOR
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check the connection of the airbag sensor assy center connectors.
OK:
The connectors are connected.
HINT:
When the connectors are not firmly connected, disconnect them once and reconnect them securely.
2 CHECK AIR BAG SENSOR ASSY CENTER
(a) Connect the negative (-) terminal cable to the battery,
and wait at least for 2 seconds.
(b) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(c) Clear the DTCs stored in memory (see page 05-1215).
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(f) Check the DTCs (see page 05-1215).
OK:
DTC B1135/24 is not output.
HINT:
Codes other than code B1135/24 may be output at this time, but
they are not related to this check.
NG Go to step 3
OK
USE SIMULATION METHOD TO CHECK
05262-05
Page 1104 of 2572
C83399
C81406H41456
Disconnection Detection Pin
w/ Side and Curtain Shield Airbag: w/o Side and Curtain Shield Airbag:
Disconnection Detection Pin
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1321
1511 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 PERFORM A VISUAL CHECK OF THE DISCONNECTION DETECTION PIN
(a) Check the disconnection detection pin of the connector.
HINT:
Compare one connector with the other 2 connectors.
OK:
No deformation is identified.
NG REPAIR OR REPLACE AIRBAG SENSOR ASSY
CENTER CONNECTOR
OK
REPLACE AIR BAG SENSOR ASSY CENTER (SEE PAGE 60-53)