TOYOTA HIGHLANDER 2001 Service Repair Manual
Page 1091 of 2572
B62676
T7
Transponder Key AmplifierT14
Transponder Key ECU Assy
VC5
CODE
TXCT
AGND B
GR
W
R8
11
12
13 1
4
5
7 TXCT
GND
ANT2 ANT1
Transponder
Key CoilVC5
CODE
Amplifier
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
05-2001
2191 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B2784 ANTENNA COIL OPEN/SHORT
CIRCUIT DESCRIPTION
The transponder key coil is built into the transponder key amplifier and receives a key code signal from the
transponder chip in the key. This signal is amplified by the amplifier, then it is output to the transponder key
ECU assy.
DTC No.DTC Detection ConditionTrouble Area
B2784Antenna coil is open/short
Wire harness
Transponder key amplifier
Transponder key ECU assy
WIRING DIAGRAM
05A2C-09
Page 1092 of 2572
B55013B63404B55013B63404B64974
T7
Transponder Key Amplifier Wire Harness Side
T14
Transponder Key ECU Assy
05-2002
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
2192 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
(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) Select the item ºANTENNA COILº on the hand-held tester.
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 Go to step 2
OK
REPLACE TRANSPONDER KEY ECU ASSY
2 CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - TRANSPONDER KEY
AMPLIFIER) (TRANSPONDER KEY ECU ASSY OR
TRANSPONDER KEY AMPLIFIER - 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
REPLACE TRANSPONDER KEY AMPLIFIER
Page 1093 of 2572
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
05-2003
2193 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B2793 TRANSPONDER CHIP MALFUNCTION
CIRCUIT DESCRIPTION
This DTC is output when trouble is found in a key during the key code registration or the key code is not
registered normally. Replace the key when the key code registration is not performed normally and this DTC
is detected.
DTC No.DTC Detection ConditionTrouble Area
B2793Transponder chip malfunctionKey
INSPECTION PROCEDURE
1 CHECK DTC
(a) Delete the DTC.
(b) Insert the key into the ignition key cylinder.
(c) Check that no code is output.
OK NO PROBLEM
NG
2 RE-REGISTER KEY
(a) Delete the DTC.
(b) Re-register the key, and check that the engine starts with the key.
OK NORMAL
NG
REPLACE KEY
052IH-1 1
Page 1094 of 2572
05-2004
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
2194 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B2794 UNMATCHED ENCRYPTION CODE
CIRCUIT DESCRIPTION
This DTC is output when a key with an incomplete key code is inserted into the ignition key cylinder.
DTC No.DTC Detection ConditionTrouble Area
B2794Key with incomplete key code is insertedKey
INSPECTION PROCEDURE
1 REPLACE KEY
052II-10
Page 1095 of 2572
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
05-2005
2195 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B2795 UNMATCHED KEY CODE
CIRCUIT DESCRIPTION
This DTC is output when a key with a key code that has not been registered in the ECU is inserted into the
ignition key cylinder.
DTC No.DTC Detection ConditionTrouble Area
B2795Key with unregistered key code is insertedKey
INSPECTION PROCEDURE
1 DELETE DTC AND INSERT ALL PRESENTLY AVAILABLE KEYS TO CHECK
WHETHER ENGINE STARTS OR NOT
OK NO PROBLEM
(BECAUSE OF KEY RE-REGISTRATION)
NG
REPLACE KEY THAT DOES NOT START ENGINE
052IJ-12
Page 1096 of 2572
B62676
T7
Transponder Key AmplifierT14
Transponder Key ECU Assy
VC5
CODE
TXCT
AGND B
GR
W
R8
11
12
13 1
4
5
7 TXCT
GND
ANT2 ANT1
Transponder
Key CoilVC5
CODE
Amplifier
05-2006
- DIAGNOSTICSENGINE IMMOBILIZER SYSTEM
2196 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B2796 NO COMMUNICATION IN IMMOBILIZER
SYSTEM
DTC B2798 COMMUNICATION MALFUNCTION NO. 2
CIRCUIT DESCRIPTION
This code is stored in the memory when a key that does not have a transponder chip is inserted or if commu-
nication between the key and transponder key ECU assy is impossible.
DTC No.DTC Detection ConditionTrouble Area
B2796No communication
Key
Wire harness
Transponder key amplifier
Transponder key ECU assy
B2798Communication errorKey
WIRING DIAGRAM
05A2G-10
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