Theft Deterrent Keyless Entry. Dtc B2764 Short To Gnd In Intrusion Sensor Signal Circuit

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200

Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) (IOUT)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - MAP LIGHT ASSEMBLY)

INSPECT MAP LAMP ASSEMBLY

DTC B2764 Short to GND in Intrusion Sensor Signal Circuit

DESCRIPTION

The intrusion sensor (theft warning ultrasonic sensor) conducts self-diagnosis immediately after power is supplied to the sensor (when the theft deterrent system is set).
If a malfunction is detected in the ISIF line, the main body ECU (multiplex network body ECU) stores this DTC.

DTC Code	DTC Detection Condition	Trouble Area
B2764	After normal/trouble signal is output from intrusion sensor (theft warning ultrasonic sensor) as result of self-diagnosis, following malfunctions are detected: ISIF line circuit is shorted to ground Reception of signals other than normal/ trouble signal	Map light assembly Intrusion sensor (theft warning ultrasonic sensor) Main body ECU (multiplex network body ECU) Harness or connector

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function).
Dtc
B2764 Short To Gnd In Intrusion Sensor Signal Circuit

INSPECTION PROCEDURE

NOTICE:

If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
w/ Door Control Battery:
As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure (Click here).

1.CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) (IOUT)

Using an oscilloscope, check the waveform.

Text in Illustration
*a	Component with harness connected (Map Light Assembly)	*b	IOUT Initial Signal
*c	IOUT Initial Response	*d	Approximately 1.0 seconds
*e	Initial Diagnosis	*f	Approximately 1.0 to 1.6 seconds
*g	Approximately 0.05 seconds	*h	Approximately 5.5 seconds
*i	Disarmed State	*j	Arming Preparation State

Measurement Condition
Tester Connection	Content
Tester Connection	R7-12 (IOUT) - Body ground
Tool Setting	2 V/DIV., 100 ms./DIV.
Condition	Theft deterrent system is set (system changes from disarmed state to arming preparation state)

HINT:

If the intrusion sensor (theft warning ultrasonic sensor) is normal, an initial response is output in response to the HI input from the main body ECU (multiplex network body ECU).
If the waveform output remains LO, there may be a problem with the main body ECU (multiplex network body ECU), as there is no input from the main body ECU (multiplex network body ECU).

OK:: The waveform displays properly (HI is 6.5 V or higher and LO is below 1 V).

Go to step 2

USE SIMULATION METHOD TO CHECK (Click here)

2.CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) (IOUT)

Disconnect the map light assembly connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
R7-12 (IOUT) - R7-17(GND9)
Immediately after theft deterrent system set
Text in Illustration
*a
Front view of wire harness connector
(to Map Light Assembly)

Text in Illustration
*a	Front view of wire harness connector (to Map Light Assembly)

HINT:

With connector R7 of the map light assembly disconnected, measure the voltage at IOUT when the theft deterrent system is set.

Result
Result	Proceed to
IOUT voltage is below 1 V when theft deterrent system is set	A
IOUT voltage is 6.5 V or higher when theft deterrent system is set	B

INSPECT MAP LAMP ASSEMBLY

A

3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - MAP LIGHT ASSEMBLY)

Disconnect the E117 main body ECU (multiplex network body ECU) connector.

Disconnect the R7 map light assembly connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E117-12 (ISIF) - R7-12(IOUT)
Always
Below 1 Ω
E117-12 (ISIF) - Body ground
Always
10 kΩ or higher
R7-12 (IOUT) - Body ground
Always
10 kΩ or higher
Result
Result
Proceed to
OK (for LHD)
A
OK (for RHD)
B
NG
C

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

4.INSPECT MAP LAMP ASSEMBLY

Remove the map light assembly.Click here

Remove the intrusion sensor (theft warning ultrasonic sensor) from the map light assembly (Click here).

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
A-1 (GND) -B-17 (GND9)
Always
Below 1 Ω
A-2 (IOUT) -B-12 (IOUT)
Always
Below 1 Ω
A-4 (+B2) - B-15 (+B2)
Always
Below 1 Ω
Result
Proceed to
OK
NG

Result
Proceed to
OK
NG

REPLACE MAP LAMP ASSEMBLY (Click here)

REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) (Click here)

Tester Connection	Condition
R7-12 (IOUT) - R7-17(GND9)	Immediately after theft deterrent system set

Tester Connection	Condition	Specified Condition
E117-12 (ISIF) - R7-12(IOUT)	Always	Below 1 Ω
E117-12 (ISIF) - Body ground	Always	10 kΩ or higher
R7-12 (IOUT) - Body ground	Always	10 kΩ or higher

Result
Result	Proceed to
OK (for LHD)	A
OK (for RHD)	B
NG	C