NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Power Source/Network	Section: Networking
Model Year: 2008	Model: LX570	Doc ID: RM000003F7V000X
Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570)

DTC

U0230

Lost Communication with Rear Gate Module

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
U0230	There is no communication from the power back door unit assembly (power back door ECU).	Power source circuit of power back door unit assembly (power back door ECU) Power back door unit assembly (power back door ECU) Power back door unit assembly (power back door ECU) branch wire or connector

HINT:

For vehicles with the power back door system only.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.	DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:

w/ Navigation System:

After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.

When disconnecting the cable, some systems need to be initialized after the cable is reconnected .

2.	CHECK FOR OPEN IN CAN BUS WIRE (POWER BACK DOOR UNIT BRANCH WIRE)

(a) Disconnect the L36 power back door unit (power back door ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
L36-6 (MPX1) - L36-5 (MPX2)	Engine switch off	54 to 69 Ω

3.	CHECK HARNESS AND CONNECTOR (POWER BACK DOOR UNIT - BATTERY AND BODY GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected .

(b) Disconnect the L36 power back door unit (power back door ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
L36-11 (GND) - Body ground	Always	Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
L36-10 (ECUB) - Body ground	Always	11 to 14 V